Effect of the bioactive compound "thymoquinone" extracted from Nigella sativa and loaded with chitosan nanoparticles (TQ/ChNPs) on free larval stages of Schistosoma mansoni and their infectivity to Biomphalaria alexandrina snails
Hend
M. El-Menyawy et al.
author
text
article
2021
eng
Biomphalaria alexandrina snail is the intermediate host of Schistosoma mansoni in Egypt. This study was designed to evaluate the molluscicidal, cercaricidal and miracidicidal activities of thymoquinone bioactive compound from Nigella sativa (TQ), chitosan and thymoquinone loaded with chitosan nanoparticles (TQ/ChNPs). The results proved that thymoquinone bioactive compound from Nigella sativa (TQ) and thymoquinone chitosan and thymoquinone loaded with chitosan nanoparticles (TQ/ChNPs) against B. alexandrina showed no molluscicidal activity was recorded against B. alexandrina snails. On the other hand, the exposure of S. mansoni infected snails to TQ/ChNPs and TQ caused a considerable reduction in the infection percentages and cercarial production/infected treated snail. The average of snail infection in treated groups reached to 30% in comparison with 90.4% in the control group. The results also, showed that thymoquinone loaded with chitosan nanoparticles (TQ/ChNPs) has a promising effect on free larval stages of S. mansoni (miracidia and cercariae). Cercaricidal and miracidicidal activity of TQ/ChNPs was higher than that of TQ.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
1
16
https://ejabf.journals.ekb.eg/article_196015_eff35f71ed83b05d07b085fc4703f070.pdf
dx.doi.org/10.21608/ejabf.2021.196015
Coral bleaching occurrence along the Egyptian coast of the Red Sea during the summer heat stress period, 2020
Muhammad
Y. A. Dosoky et al.
author
text
article
2021
eng
The Red Sea is considered one of the few environments that accommodate a wide diversity of thermotolerant corals. However, the recent bleaching events had revealed that some Red Sea coral species may be under threat and may face a more dramatic future. Here, we investigate the pattern of bleaching in hard corals inhabiting the Egyptian coast of the Red Sea (from Hurghada, at the north, to Wadi El-Gemal, at the south) during the 2020 summer heat stress period. Field data on the cover, number of colonies, and severity of the bleaching were collected using the line-intercept transect method from three geographical sectors (each contains two study sites), two depth ranges (0-5m and 10-15m), and two reef systems (inshore and offshore reefs) during the period from September to October 2020. The results indicated that the bleaching symptoms of different severities had appeared on 32.74% (460/1405) of the total examined colonies (36.66% of the total coral cover). Our survey, however, revealed that corals in the southern reefs (Sector_3) were more susceptible to bleaching than those present in the north (Sector_1). We also noted that the bleaching intensity was more concentrated between 0-5m, while colonies beyond 10m were more sheltered. In contrast, the results revealed that both inshore and offshore reefs were vulnerable to bleaching with no effect for the distance from the shore on coral resistance. Furthermore, the results indicated that coral genera like Millepora, Montipora, Pocillopora, Acropora, and Porites showed high bleaching cover and severity whereby they may be more threatened by the thermal stress than the others. In the light of these results, the current study provides field evidence on the potential role of the northern reefs as a refugium for the Red Sea corals and suggests that the high latitudinal reefs may be the last to decline due to climate change. On the other hand, the recorded bleaching pattern at the southern coasts, albeit less acute, may raise the concern on the vulnerability of these reefs to the heat stress than was expected.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
17
37
https://ejabf.journals.ekb.eg/article_196904_dedca9524fd7cc46bbd8bb5a95ade261.pdf
dx.doi.org/10.21608/ejabf.2021.196904
Status of Symbiodiniaceae abundance in hard corals during the 2020 bleaching event along the Egyptian Red Sea coast
Muhammad
Y. A. Dosoky et al.
author
text
article
2021
eng
In the present study, the density of endosymbiotic dinoflagellates (Family: Symbiodiniaceae) has been used as a measure to investigate the effect of summer heat stress on the hard corals inhabiting the Egyptian coast of the Red Sea. Count data were collected between September and October 2020 throughout a microscopic examination of eight keystone coral genera (n= 301) sampled from three sectors (contain six sites), two reef localities (inshore and offshore), two depth ranges (0-5 m and 10-15 m), and four bleaching severity states (from 0% unbleached to 51-99% highly bleached colonies). The results indicated that coral samples collected from the southern sites (Sector_3) were associated with lower densities of Symbiodiniaceae compared to coral samples collected from the northern (Sector_1) or mid sites (Sector_2). Also, samples collected from the surface water had demonstrated lower Symbiodiniaceae density compared to those collected from the deep. Conversely, our results indicated that there was no effect for the distance from the shore on the Symbiodiniaceae density in the examined samples. Furthermore, our analysis revealed that Millepora was particularly associated with the lowest Symbiodiniaceae density among the other genera. On the other hand, the density of Symbiodiniaceae cells decreased – as expected – with increasing bleaching severity in the study samples (n= 131). However, this discrimination between bleached and unbleached colonies was largely restricted to acute bleaching severities. Taken together, these results suggest that while the corals at the northern Egyptian coast of the Red Sea look more tolerant, corals at the southern reefs may be threatened by the summer heat stress.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
39
56
https://ejabf.journals.ekb.eg/article_196905_987c769d48354f7f8b55c88a20467605.pdf
dx.doi.org/10.21608/ejabf.2021.196905
Critical lengths and Fisheries management of Rhabdosargus haffara (Forsskål, 1775) from Hurghada fishing area, Red Sea, Egypt
El-Mahdy,
S. M. et al.
author
text
article
2021
eng
The present study aimed at determining the critical lengths and the population parameters required for the management of Rhabdosargus haffara in the Hurghada fishing area, Red Sea, Egypt. During the fishing season 2018-2019, 466 specimens of R. haffara were gathered monthly from the Hurghada landing site. The length at first capture (Lc) was 14.0 cm, while the length at first sexual maturity (Lm) was 17.9 cm. The Lc was greatly smaller than the Lm in an indication for heavy exploitation of this species. Total mortality (Z) was estimated to be 1.98/y, natural mortality (M) was 0.66/y, and accordingly, the fishing mortality (F) was 1.32/y. The rate of exploitation (E) was calculated at 0.67 in another indication for the overfishing status of the R. haffara stock in the Hurghada fishing ground, Egypt. The yield per recruit model was used to confirm the stock's overfishing status and to determine the optimal fishing mortality that could save this important fishery in the Egyptian Red Sea.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
57
67
https://ejabf.journals.ekb.eg/article_197171_696eff66c3b3b58aaafca0ca6681127e.pdf
dx.doi.org/10.21608/ejabf.2021.197171
Cytochrome P450 1A gene expression in response to therapies for the bacterial infection in fish.
Ahmed
M. Hal
author
Manal
I. El-Barbary
author
text
article
2021
eng
Cytochrome P450 1A (CYP1A), a cytochrome P450 gene, participates in the metabolism of xenobiotics. In this research, levels of CYP1A expression were evaluated in treated and untreated bacterial infections in Oreochromis niloticus organs and histopathological changes in splenic tissues. Twelve groups of O. niloticus fish: control (T1-4), fish infected with Aeromonas hydrophila (T5-8), and fish infected with Pseudomonas fluorescens (T9-12) groups) were treated with Nigella sativa oil and ciprofloxacin. In the uninfected group, treatment doses did not affect CYP1A expression levels. In infected fish, the level of CYP1A expression significantly increased without treatment while relative CYP1A expression was significantly downregulated when treated with N. sativa oil and ciprofloxacin additives. The combined treatments had a synergetic effect on the downregulation of CYP1A expression in the liver and gill. The main histological alterations in the spleen of infected fish were severe hyperplasia of melanomacrophage centers (MMCs), which was higher in the A. hydrophila infected fish than in the P. fluorescens infected fish. The results clarify the mechanisms of CYP1A gene expression and MMCs against pathogens and their consequences.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
69
87
https://ejabf.journals.ekb.eg/article_197272_736cc6b46b64a2ee3d486f68d242b052.pdf
dx.doi.org/10.21608/ejabf.2021.197272
Status of Pathogenic Bacteria with their Antibiotic Susceptibility in Indigenous and Exotic Climbing Perch, Anabas testudineus (Bloch, 1972) in North-Eastern Bangladesh
Md. Abdul
Baten et al.
author
text
article
2021
eng
Information on pathogenic bacterial contamination and their antibiotic susceptibility to infrequently consumed fishes are largely unknown. This study aimed to assess the status of pathogenic bacteria with their antibiotic susceptibility in two varieties of climbing perch Anabas testudineus (capture-based indigenous and culture-based exotic) in North-Eastern Bangladesh. Thirty (30) indigenous and exotic climbing perch were collected separately from ten (10) fish markets of Sylhet Sadar to investigate total viable count (TVC), total coliform count (TCC), total faecal coliform (TFC) count, and a variety of pathogenic bacteria with their antibiogram profile. Significantly (P<0.05) higher values of TVC, TCC, and TFC were recorded in indigenous climbing perch than those of the exotic variety. The pathogenic bacteria such as Escherichia coli, Pseudomonas spp., Aeromonas spp., Staphylococcus aureus, Salmonella spp. and Vibrio spp. were detected in the studied samples. In comparison to the indigenous climbing perch, the antibiotic sensitivity assay revealed that exotic climbing perch had more multidrug-resistant bacteria. Since the presence of pathogenic bacteria in fresh fish is unsafe for human consumption and considered as rejected for export, the current study emphasizes the importance of assuring the safety and quality of climbing perch at all stages until it reaches consumers.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
89
102
https://ejabf.journals.ekb.eg/article_197352_41b2a9d43b135b8091991ea08eafd64a.pdf
dx.doi.org/10.21608/ejabf.2021.197352
Effects of vitamin C on structural changes in the tissues of the giant African catfish, Heterobranchus longifilis exposed to Zinc Oxide nanoparticles
Olufemi
D. Owolabi
author
Saratu
I. Abdulkareem
author
text
article
2021
eng
Heterobranchus longifilis juveniles (n = 450, Mean length ± SD = 10.28 ± 1.34 cm) were exposed to varying concentrations (0 = control, 6.00, 8.00, 10.00, 12.00 mg/l) of zinc oxide nanoparticles (ZnO-NPs) for 60 days to determine its effects on the histopathology of the gill and liver. To evaluate recovery from ZnO-NPs exposure, fish were subjected to a 30-day depuration. Ascorbic acid (AA) ameliorative potential against ZnO-NPs toxicity was assessed by augmenting fish basal diet with different AA (50.00, 250.00, 500.00, 1000.00 mg.kg-1) levels. After each experiment, fish gills and liver were removed for histopathological analysis. Gills of exposed fish revealed different alterations like epithelial hyperplasia, epithelial lifting, lamellar fusion, oedema, aneurysms, and necrosis; while alterations such as nuclear vacuolation, fatty degeneration, cytoplasmic degeneration, focal fibrosis and necrosis were recorded in the liver. The mean degree tissue change (DTC) in both organs of ZnO-NPs-exposed fish gradually increased with an increase in ZnO-NPs concentration and exposure period. After 30-day depuration, some of the lesions in both organs attained recovery, while others did not. AA administration to ZnO-exposed fish at 500 mg.kg-1 completely reversed the lesions in both organs compared to the normal tissue architecture in the control. The results suggest that ZnO-NPs could trigger structural alterations in both the branchial and hepatic tissues of H. longifilis, and full recovery under depuration was slow. However, 500 mg.kg-1 AA dietary supplementation have the propensity to ameliorate the ZnO-NPs-induced pathological lesions in H. longifilis.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
103
129
https://ejabf.journals.ekb.eg/article_197872_ef1000b0eaa47415c5dfa00993de748f.pdf
dx.doi.org/10.21608/ejabf.2021.197872
The Seasonal Fluctuations of Phytoplankton Diversity and its Biochemical Components in Lake Qarun, Egypt
Nasser
S. Flefil
author
Abeer
M. A. Mahmoud
author
text
article
2021
eng
A one-year seasonal study was carried out to estimate the algal population and its biochemical contents in Lake Qarun in Egypt. Twelve samples representing Lake Qarun and two drains (El-Bats and El-Wadi) were examined. Bacillariophyta was the most dominant in phytoplankton assemblages. The highest seasonal phytoplankton density was recorded during summer, whereas the lowest was in autumn. The lowest spatial phytoplankton density, chlorophyll (a), and carotenoid concentrations were recorded in drains. ANOVA revealed significant differences between seasons and stations in the density of phytoplankton species, protein, carbohydrate, and lipid. Principal component analysis (PCA) results showed that water temperature was positively correlated with Ochrophyta, Cyanobacteria, Cryptophyta and some dominant phytoplankton species, meanwhile; water temperature was negatively correlated with Bacillariophyta, some dominant phytoplankton species, Chl (a), carotenoid, protein, carbohydrate, and lipid. Hence, water temperature and nutrients (NO3 and PO4), drained into the lake, play a major role in the trophic state changes of Lake Qarun, and its effect on the phytoplankton community and other environmental conditions was detected during the seasons of the year.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
131
145
https://ejabf.journals.ekb.eg/article_198132_5ac7d1348e15579417e023c3dc7d470c.pdf
dx.doi.org/10.21608/ejabf.2021.198132
Bottom trawls specifications and their relation with the stock of Rhabdosargus haffara in the Gulf of Suez, Red Sea Egypt.
Mohamed
M. Elkohafy et al.
author
text
article
2021
eng
This study was conducted at Attaka harbor in the Gulf of Suez (Red Sea) during the 2018-2020 fishing seasons to assess the technical specifications of trawl nets, morphometric characteristics of haffara sea bream (Rhabdosargus haffara), and their selectivity parameters. Results indicated that these trawl nets have different design characteristics; it depends on the technical characters of the trawler (i.e. horsepower, length of trawler). The hanging ratio of the bottom trawl ranged from 0.44 to 0.76, while the horizontal opening of the net ranged from 17.91 to 30.94 m. The length-weight relationship (LWR) of Rhabdosargus haffara had a significant correlation and the exponent b was observed to be 3.03. On the other hand, length-girth and length depth were analyzed and the correlation coefficients were determined to be 0.85 and 0.80, respectively. Lengths at first capture (L50) for male, female, and combined sexes were 12.67, 14.45 and 13.17 cm, respectively; which were higher than the minimum landing size. This information may be used by fishery managers to get an approximate estimate of the bottom trawl effect and to design appropriate marine spatial planning.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
161
171
https://ejabf.journals.ekb.eg/article_198364_bc3a7e33bb52226f863e18dcbece778f.pdf
dx.doi.org/10.21608/ejabf.2021.198364
Assessment of fibroblast growth factor 23, antioxidant enzymes activities and heavy metals in Oreochromis niloticus and Clarias gariepinus
Soha
M. Hamdy et al.
author
text
article
2021
eng
The aim of this study was to assess the fibroblast growth factor (FGF23) hormone, chemical composition, antioxidant enzymes activities, biochemical parameters, and heavy metals concentration in Oreochromis niloticus and Clarias gariepinus collected from the River Nile, Rosetta branch during 2019. Fifty samples from O. niloticus and C. gariepinus were collected from (I) at El-Qanater El-Khyria, (II) after El-Rahawy Drain, (III) at Kom Hamada city, and (IV) at Kafr El-Zayat city. Serum levels of FGF23, glucose, total protein, albumin, urea, and creatinine were assessed. Tissue levels of Fe, Zn, Cu, Mn, and Cd, the activities of superoxide dismutase (SOD), catalase (CAT) and glutathione S-transferase (GST), the values of malondialdehyde (MDA), moisture, protein, lipid, and ash were also assessed. The results showed significant difference (P<0.05) in the levels of FGF23, glucose, total protein, albumin, urea and creatinine in serum and the activities of superoxide dismutase (SOD), catalase (CAT) glutathione S-transferase (GST), and malondialdehyde (MDA) in the tissue of O. niloticus and C. gariepinus from studied stations of Rosetta branch as compared with control site (I). Metal accumulation in different tissues of the studied fish samples was found to be in the following order: Fe > Zn > Mn > Cu > Cd in muscles and gills. The mean values of moisture, protein, lipid, and ash were 80.16, 17.18, 1.23, and 1.14% for O. niloticus and 78.66, 18.16, 1.61, and 1.18% for C. gariepinus, respectively. All data indicated that the environmental condition seriously affected the fish quality. Thus, the FGF-23 assay can be used in prospective trials to valid its utility as a biomarker of environmental pollution.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
173
188
https://ejabf.journals.ekb.eg/article_198462_1acb64e599e517222bce93935f90af98.pdf
dx.doi.org/10.21608/ejabf.2021.198462
Enumeration and Detection of Main Pathogenic Bacterial Genera in Rahawy and Bilbeis Agriculture Drains
Hoda
Kabary et al.
author
text
article
2021
eng
Pathogens in agricultural drainage water represent a major threat to the public health of humans and livestock, food safety, and ecosystem quality as well. The microbiological intensities of pathogenic bacteria including, total fecal bacteria, E. coli, Salmonella sp., Shigella sp., Campylobacter sp. streptococci sp. E. coli O157 and Listeria sp., in two sites of each of Rahawy and Bilbeis agricultural drains, were characterized by selective media culturing techniques. Selective Media applied for detection and counting were MacConkey agar (MAC), Salmonella Shigella agar (SS Agar), Campylobacter Blood free selective medium (CCDA), Modified Tryptic soy agar (TSA), MacConkey sorbitol agar (SMAC), and Listeria oxford agar for total fecal bacteria, E. coli, Salmonella sp., Shigella sp., Campylobacter sp. streptococci sp. E. coli O157 and Listeria sp. count respectively. The strains were identified and selected by the reaction obtained after full growth on the differential agar media. The obtained results confirmed that Rahawy and Bilbeis water samples exhibited high intensities with pathogenic bacteria compared to river Nile water. River Nile water samples were free from either Salmonella or Shigella, with the lowest numbers of Campylobacter sp. E. coli and E. coli O157 (3x102, 30 and 1, respectively). Rahway water samples (after Hadar site) had the highest density of E. coli (5x104) and Salmonella sp. (4x103), while Bilbeis (at Bridge site) had a lower density of Salmonella (10) and Shigella sp. (20) and the highest density of Campylobacter sp. (6x104).
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
189
202
https://ejabf.journals.ekb.eg/article_198525_c5ebe302062fe6cb6006ab921555244a.pdf
dx.doi.org/10.21608/ejabf.2021.198525
The use of biomarkers in the Nile Tilapia (Oreochromis niloticus) as biological signals to track Nile contamination in Egypt.
Rashad
E.M. Said et al.
author
text
article
2021
eng
In aquatic ecosystem biomonitoring, the use of biota and their habitat provides a good indication of conditions and potential threats to any water body. The potential for heavy metal poisoning in humans because of consuming tainted fish has gotten a lot of press around the world. Heavy metal pollutants in water are mostly caused by human activities such as waste disposal, organic fuel combustion, phosphate fertilizers, plastics, and pesticides. The aim of this study was to see how much heavy metals contamination there was in Nile tilapia Oreochromis niloticus and how physicochemical characteristics affected the biomarkers. Heavy metals accumulation (cadmium, lead, zinc, copper, and iron) was studied on the serological indices of a freshwater fish O. niloticus. Fish, water, and sediments were collected at three locations along the Nile River. The findings of this study showed a significant difference in water quality indices in response to pollution levels among the sites studied. Consequently, the current results confirm that the distribution of heavy metals in tissues could potentially deteriorate biochemical parameters of. O. niloticus.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
203
214
https://ejabf.journals.ekb.eg/article_198551_6da4efdd80237d9c04661ee2e303ae44.pdf
dx.doi.org/10.21608/ejabf.2021.198551
Characterization and screening of marine-derived fungi along the coastline of Alexandria, Mediterranean Sea, Egypt
Ahmed
Gad et al.
author
text
article
2021
eng
Egypt is considered as a white spot for fungal biodiversity thus, this study used ITS sequencing, and routine identification to analyze the fungal communities within different marine sources (sediments, water, algae, and wood) from the Egyptian Mediterranean Sea at Alexandria coastline, which helped to uncover fungal diversity and distribution pattern. Two hundred fifty-two marine fungal isolates were isolated from twenty-five sea sediment, seven water, eight algae, and eight wood samples, which were collected seasonally through sex trips during the year 2017/2018 from the Egyptian Mediterranean Sea, Alexandria, Egypt. In the present study, sediment samples contained the highest diversity of fungi, and the most dominant phylum was the Ascomycota (90.8% OTUs) followed by the Basidiomycota (6.7% OTUs). A small proportion of the OTUs was assigned to the Mucoromycota. Some available indices had been successfully followed during this study for estimating the fungal biodiversity, and these indices proved their effectiveness.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
215
239
https://ejabf.journals.ekb.eg/article_198560_40a5522fd609956d9e6dfe77839cc7aa.pdf
dx.doi.org/10.21608/ejabf.2021.198560
Interaction of salinity and natural feed on growth and survival rate of the Banggai cardinalfish (Pterapogon kauderni) for ex-situ conservation development
Hasim
et al.
author
text
article
2021
eng
The Banggai cardinalfish (Pterapogon kauderni) is an endemic and protected fish. However, its exploitative use and damage to its microhabitat ecosystem have led the fish to be endangered. This study aims at determining the effect of salinity and type of natural food on the growth and survival rate of Banggai cardinalfish. The method employed is experiment with a factorial completely randomized design (CRD) encompassing salinity factor (26 ppt, 20 ppt, 14 ppt, and 8 ppt) and food factor (rebon shrimp, Artemia sp. and mosquito larvae). This study uses 36 aquariums as containers with a volume of 10 liters equipped with a Recirculation Aquaculture System (RAS). The animals used in this study are 360 Banggai cardinalfish with an average length of 28.31 mm and an average weight of 0.29 g. The stocking density is 1 fish/L with a rearing period of 30 days. The observed data include growth and survival rate, in which the data are analyzed by applying analysis of variance (ANOVA). The result of the analysis reveals that the difference in salinity level does not significantly affect the length and weight gain (Fcount > Ftable(0.05)), yet it affects the survival rate significantly (Fcount > Ftable(0.05)). In addition, the different types of natural food significantly affect the length and weight gain, and survival rate (Fcount > Ftable(0.01)).
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
241
252
https://ejabf.journals.ekb.eg/article_198591_1a9a8fd9f539cc02f716de6726d4b152.pdf
dx.doi.org/10.21608/ejabf.2021.198591
Assessment of Ocimum basilicum Extracts on Schistosoma mansoni Infected Biomphalaria alexandrina Snails and Mice
Hanan
S. Mossalem et al.
author
text
article
2021
eng
Schistosomiasis is one of the most prevalent diseases worldwide despite the conventional drug praziquantel and molluscicides. The quest for a free-toxic clinical treatment and friendly environmental and molluscicide has intensified. In this study, the compositions of African Ocimum basilicum plant extracts were prepared and analyzed. Then, their cytotoxicity, antioxidant, and anti-schistosomiasis impacts were studied. The constituents of O. basilicum essential oil and ethanol extract were analyzed by the HPLC and GS/MS techniques, respectively. DPPH and SRB assays were applied to test the antioxidant activity and cytotoxicity of the two extracts, respectively. Furthermore, the efficacy of both extracts on Schistosoma mansoni-infected B. alexandrina snails and mice was examined. The results demonstrated that the ethanol extract has fourteen compounds with different concentrations: Caffeic acid (553.46 mg) is the highest concentration, and carnosic acid (79.14 mg) is the lowest. However, the essential oil analysis revealed more components (n=25) with the highest content due to linalool (21.52%), and the lowest is phytol acetate (8%). Exposure of B. alexandrina snails to O. basilicum extracts (50 ppm, each) showed a significant (P<0.001) decrease in the infection rates (35% and 21%, respectively) and an increase in the survival rates (95% and 96%, respectively) compared to the untreated, infected snails (85% and 95, respectively). The administration of mice with the mono O. basilicum extracts significantly reduced the worm burden, egg loads, and intact eggs in favor of the essential oil. Interestingly, our study demonstrated more fibro-cellular hepatic granulomas in the mice treated with the ethanol extract than in mice treated with the essential oil. In conclusion, our data is suggesting a promising anthelminthic and antioxidant herb. Further investigations are to be considered to examine the effectiveness of O. basilicum extracts in combination with praziquantel.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
253
271
https://ejabf.journals.ekb.eg/article_198598_b5d7cfd77edb280e220ad1ff4ac98df7.pdf
dx.doi.org/10.21608/ejabf.2021.198598
Phylogenetic analysis of the Red Sea tiger snake eel Myrichthys maculosus (Family Ophichthidae) by using 16S rRNA
Zeinab
A. Mar′ie
author
text
article
2021
eng
The Red Sea tiger snake eel Myrichthys maculosus belongs to the family Ophichthidae, order Anguilliformes, represented with 11 relative species and two outgroups for phylogenetic analysis by mean of large subunit 16S rRNA sequence. M. maculosus contains a high concentration of AT (53.8%) more than GC (46.1%), higher also in other understudying Ophichthidae species. The genetic distance values among M. maculosus and other related species ranged from 0.0006 to 0.029, while among all species ranged from 0.006 to 0.037%. Overall the distance value was 0.167%. The smallest genetic distance (0.006) was between M. maculosus (MW435681) and the same one under the accession number of DQ645692, while the largest distance (0.036%) was between Scolecenchelys breviceps and Ophichthus zophochir&O. apicalis. The three phylogenetic trees Maximum likelihood (ML), Neighbour Joining (NJ), and Minimum Evolution (ME) applied here showed the same relations with slightly different in support values.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
297
306
https://ejabf.journals.ekb.eg/article_198816_0374f01230d8d4f71c58489b7abc8aa5.pdf
dx.doi.org/10.21608/ejabf.2021.198816
Biochemical and Nutritional Studies on the Nile Tilapia Fed Orange Peel Additive
Raky
F. Attalla et al.
author
text
article
2021
eng
The present study recorded a good trial for using orange peel as a natural additive to enhance the growth, the physiological, biochemical, and immunity measurements of the mono-sex Nile tilapia. Orange peel additive, 2% dried powder, 2% oil extraction, and 2% mixture of them (1:1); diet 1, diet 2, and diet 3, respectively, were used for feeding three test groups of fish besides to the control (0% additive). The best growth performance, feed utilization, and blood measurements were recorded for the three treated groups especially for those fed diet 3, which contained the mixture when compared to the control. Orange peel additive increased (p < 0.05) body protein and plasma total protein, while blood enzymes activity, lipid content, and cholesterol were decreased (p < 0.05). Immunological blood parameters (IgG & IgM) were enhanced for fish fed the additive. The present results determined that the immune response system was improved for fish fed the forms of orange peel.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
307
321
https://ejabf.journals.ekb.eg/article_199579_f28820661e0bd55c00ee10145547fd42.pdf
dx.doi.org/10.21608/ejabf.2021.199579
Characterization of the artisanal fishery in the projected marine protected area “Jabal Moussa”.
Mohamed
Rida Derdabi
author
Mustapha
Aksissou
author
text
article
2021
eng
This study was carried out in the marine part of the projected protected area «Jabal Moussa », overlooking the Strait of Gibraltar. It aimed to clarify the characteristics of the artisanal fishery, with the ecological significance and to provide baseline information to help in developing suitable management measures. Data were collected from April 2018 to May 2019, through detailed surveys and structured interviews to analyze fleet features, species and landing composition, fishing gears, and socio-economic data such as age, experience, capital invested, gross product, etc... where 293 fishermen were interviewed. For skippers, the average age was 51.4 ±11.2 years and 32.5 ±9.6 years for seamen. The crew was small (2-4 people/boat). It was noted that 84% of fishermen did not want their children to become fishermen, while 46% of fishermen declared their desire to change their job. A total of 14267 fishing trips were recorded and 160.529 Kg of biomass composed of 31 species belonging to 9 orders were landed by 99 fishing boats, using 8 different gears; mainly, the blackspot seabream longline. The capital invested was 4.680.800 MAD and the gross product was 22.185.246 MAD.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
271
296
https://ejabf.journals.ekb.eg/article_199621_86b6d577be5e2b9ac6c838ee662ed04c.pdf
dx.doi.org/10.21608/ejabf.2021.199621
Effect of Different Hydrocolloids on the Quality Criteria of Fish Fingers during Frozen Storage
Abdelrahman
S. Talab
author
Mahamed
Abou-Taleb
author
text
article
2021
eng
The effect of some hydrocolloids on the quality of common carp fish fingers was evaluated during frozen storage for six months. Sodium alginate (ALG), carrageenan (CGN), hydroxyl propyl methylcellulose (HPMC), xanthan gum (XG), and chitosan (CH) were used as additives (5g/kg) in common carp fish fingers, and the proximate composition and physical, chemical, microbiological, and sensory properties were evaluated at regular intervals in common carp fish fingers. The results showed that the moisture, protein, lipid, and ash of minced common carp fish samples, raw common carp fish fingers, and pre-fried common carp fish fingers were 75.15, 18.55%, 4.01%, and 4.30; 71.80%, 17.75%, 2.56%, and 5.90%, and 66.29%, 17.30%, 5.95%, and 6.28%, respectively. The changes in chemical composition between fresh common carp fish, fish fingers, and pre-fried fish fingers were found significant (P< 0.05). The values of pH, total volatile basic nitrogen, trimethylamine, thiobarbituric acid total bacterial count, psychrophilic bacteria, and yeast & molds counts increased significantly during the storage period, but the values were within the acceptable limits. The organoleptic evaluation revealed that the different added hydrocolloids didn’t significantly affect the flavor of common carp fish fingers, while chitosan and carrageenan improved the taste, textures, and appearance of common carp fish fingers significantly in comparison to the control and other trails. In conclusion, different types of fish fingers were acceptable even at the end of the storage period; also, different hydrocolloids were effective in retaining the quality properties of treated fish fingers and showed better performance than the control.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
323
335
https://ejabf.journals.ekb.eg/article_199622_fb908affbbb91a27d24e21334377c4de.pdf
dx.doi.org/10.21608/ejabf.2021.199622
Use of the microalga Scenedesmus obliquus (Turpin) Kutzing to remove some heavy metals from the industrial wastewaters
Yahia
Mosleh et al.
author
text
article
2021
eng
Aquatic ecosystems may receive hazardous heavy metals resulting from the overconsumption of petrochemical products. Chemical and physical analysis of wastewater of certain petrochemical plants was studied; and pointed for the existence of Cd, Pb, Zn, Ni, Cu, Co, Fe and Mn. The objective of this work is to study the effectiveness of immobilized Scenedesmus obliquus to remove such pollutants. Both fresh and dry biomass of the micro-green alga S. obliquus in immobilized form was used as low cost, efficient, and eco-friendly biosorbent for some heavy metals’ removal. According to the results, the biosorption removal efficiency in general with all heavy metals was around 50% after 15 min. of treatment, and it reached 95% after 60 min, while the efficiency rate remained stable or was slightly lowered after 120 min. Moreover, the cited results clarify that S. obliquus as biosorbent was more powerful in removing Pb, Cd and Fe followed by Ni, Cu, Mn, Co, and Zn from the aqueous solution of petrochemical wastewater. For further verification, at the end of the treatment process, the algae cells were examined under the scanning electron microscope (SEM), which showed large clusters of heavy metals appeared adsorbed on the surfaces of the cells, which reflects the high efficiency of S. obliquus in removing heavy metals from industrial wastewaters. These results motivate us to apply the use of live or dry algae mass as an effective and safe method for the disposal of heavy metals and industrial effluents.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
337
354
https://ejabf.journals.ekb.eg/article_199738_2cd43e3c22fb014e2f9bd0b52a2be984.pdf
dx.doi.org/10.21608/ejabf.2021.199738
Chemical characterization, biocidal and molluscicidal activities of chitosan extracted from the crawfish Procambarus clarkii (Crustacea: Cambaridae)
Salwa
A. H. Hamdi et al.
author
text
article
2021
eng
Invertebrates have many useful pharmacological activities. The present investigation aims to study some of these activities in the red swamp crawfish Procambrus clarkii against a varying number of pathogens. Results showed that raw chitosan had molluscicidal and larvicidal effects on both Biomphalaria alexandrina snailsandSchistosoma mansoni larvae. Also, the current study confirmed the inhibitory action of chitosan against three gram-positive bacteria (Streptococcus faecalis, Bacillus subtilis, and Staphylococcus aureus) and three gram-negative bacteria (Neisseria gonorrhoeae, Pseudomonas aeuroginosa and Escherichia coli). Additionally, in the current study chitosan revealed antifungal activity against Candida albicans but no effect was detected against Aspergillus flavus. The present results indicated that chitosan can be used as a molluscicidal agent, a rodenticide against the albino rat and insecticide against adults of the tiny black ants, Monomorium minimum. For the first time, under field conditions, raw chitosan has herbicidal activity against Cyperus rotundus weeds of chitosan were demonstrated. Conclusively, these natural by-products can be used as biocidal agents against different pathogens.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
355
371
https://ejabf.journals.ekb.eg/article_200336_5e30132e13badf59713526b8845a1d61.pdf
dx.doi.org/10.21608/ejabf.2021.200336
Length-weight, condition factors, age, and growth of Scomber japonicus (Houttuyn, 1782) from the Egyptian Mediterranean Sea
Mohamed
F. Abdel Fattah et al.
author
text
article
2021
eng
Length-weight, condition factors, age, and growth of Scomber japonicus were investigated. The specimens were collected monthly from Alexandria landing centers during 2017 and caught using night purse seine ranging from 12.9 to 34.4 (TL) (average, 21.00 ± 4.1) cm and from 15.10 to 391.49 (TW) (average, 92.81 ± 59.17) g. The exponent “b” of the length-weight relationships were “>3” for females (b = 3.24), males (b = 3.25), and all samples (b = 3.15), reflecting the positive allometric mode of growth. Moreover, the positive allometric mode of growth was observed for the relationship between forked length (FL) and standard length (SL) with weight. The annual average of absolute condition was 0.89 ± 0.06, with the highest value during April (0.96 ± 0.05). The annual average relative condition was 1.01 ± 0.06, with the highest value (1.10 ± 0.10) during August. The absolute condition (Kc) increased with the increasing length. However, the relative condition showed an inverse trend. The age of S. japonicus was determined using length-frequency analysis giving five age groups at mean lengths of 14.09, 19.29, 23.82, 28.25, and 31.76 cm for the 1st, 2nd, 3rd, 4th, and 5th age groups, respectively. The third age group (III) was the most frequent one (38.89%). The estimated growth parameters were L∞ of 38.11 cm; W∞, 534.74; K, 0.33 year-1; growth performance (Ø), 2.68; and t-max, 8.89 years. In conclusion, the present data reflected a good stock status with the suitability of living habitats. Further continuous monitoring is recommended for better fishery management and conservation.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
373
391
https://ejabf.journals.ekb.eg/article_200627_20e7c79ab657efbe22ce789d00982770.pdf
dx.doi.org/10.21608/ejabf.2021.200627
Effect of Smoking Methods and Refrigerated Storage on Physicochemical, Microbiological and Sensory Properties of the Sagan Fish
Shaban
El-Sherif et al.
author
text
article
2021
eng
Smoked fish is a worldwide very popular and delicious product. This study aimed to investigate the effects of smoking methods and cold storage 4±1°C on the proximate composition, physicochemical, microbiological and sensory properties of sagan fish. Results revealed that the smoking process significantly decreased the values of moisture, pH, total viable bacteria, yeast and mould counts, while it significantly increased the values of protein, lipid, ash, sodium chloride, carbohydrate, total volatile basic nitrogen, trimethylamine nitrogen, thiobarbituric acid. On the other hand, total coliform decreased during cold smoking though it was not detected in hot smoked samples. Regarding the storage conditions, the moisture content was significantly decreased during storage at 4±1°C, while the values of protein, lipid, ash, sodium chloride, pH, total volatile basic nitrogen, trimethylamine nitrogen, thiobarbituric acid, total viable bacteria, yeast and mold counts and total coliform were significantly increased. Overall acceptability illustrated that hot smoked segan products were highly accepted compared to cold smoked and all those processed by cold storage. Therefore, the results indicated that hot smoked sagan fish possessed higher quality, safety and acceptance than the cold-smoked fish. By cold storage, shelf life was 40 days for hot-smoked compared to 30 days for cold smoked.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
393
407
https://ejabf.journals.ekb.eg/article_201237_a86e6fbcb1c6b709a65f1f08e85ad05d.pdf
dx.doi.org/10.21608/ejabf.2021.201237
Identification of Bacterial Symbionts from the Marine Sponge Aaptos suberitoides (Demospongiae: Suberitidae)
Hafshoh
Maisyaroh et al.
author
text
article
2021
eng
The sponges are primitive multicellular animals (metazoans) that belong to the phylum of Porifera. They are symbiotic with bacteria, archaea, microalgae and fungi, and the common symbionts organisms. Symbionts bacteria are obtained vertically through gametes and horizontal through the filter feeder process. This study aimed to isolate and the species of symbionts bacteria in Aaptos suberitoides sponge from Pasir Putih Beach waters Situbondo, East Java. Six symbionts bacterial were isolated from the sponge Aaptos suberitoides; namely, Corynebacterium hofmanni, Vibrio damsela, Oligella urethralis, Bacillus coagulan, and Bordetella parapertusis. Biochemical tests confirmed that the symbiotic bacteria can perform several processes: nitrification process, citrate, urease, Voges Proskauer, decarboxylase lysine, and decarboxylase ornithine and hydrolysis aesculin. In conclusion, excluding Bacillus coagulant bacteria, symbionts bacterial were proved mostly pathogenic to humans and fish.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
409
418
https://ejabf.journals.ekb.eg/article_201255_97f2c7a2476eed6c41836c3b37f0eac2.pdf
dx.doi.org/10.21608/ejabf.2021.201255
Population dynamics analysis of the yellowstrip scad (Selaroides leptolepis, Cuvier 1833) in the waters of Ternate Island
Umar
Tangke et al.
author
text
article
2021
eng
The purpose of this study was to review the parameters of the population dynamics of the yellowstrip scad (Selaroides leptolepis) for consideration in sustainable management from October 2020 to March 2021. Yellowstrip scad samples were collected using purse seine, gill net, and hand line fishing gears and then analyzed for population parameters to meet the study objectives. The parameters of the yellowstrip scad population in Ternate Island waters were relatively stable, with a maximum length value of 33.49 cm, growth coefficient of 0.99 per year, fishing mortality of 0.42, natural mortality of 1.71, exploitation rate of 0.2, and SPR 4 of 2%, and a recruitment value of 1.9% Y/R and 56.8% B/R. Whereas, these findings indicate that increased fishing effort is required until the exploitation value reaches 0.4 for optimal and sustainable management.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
419
432
https://ejabf.journals.ekb.eg/article_201258_31b15aa376bc439d528837abda5ba2b6.pdf
dx.doi.org/10.21608/ejabf.2021.201258
Use of Mahua (Bassia latifolia) Oil Cake as Non-Conventional Fish Feed Ingredient
Vikash
Chahar et al.
author
text
article
2021
eng
The present study was conducted to explore the possibility to use mahua (Bassia latifolia) oil cake (MOC) as a non-conventional fish-fed ingredient. For this purpose, an experiment was designed using five graded levels of MOC. The experiment was conducted in 15 FRP tanks of 0.75 m3each in triplicate for a period of 42 days. The fingerlings of rohu (Labeo rohita) were fed on MOC supplemented diets (i.e. 0, 10, 20, 30, and 40 % in basal diet). The experimental fish was fed at 3 % of body weight per day. The supplementation of MOC had no significant impact on water quality as the values of selected water quality parameters remained more or less identical in different treatments. However, the weight gain, gain in percent SGR and FCR were significantly improved in treatments as compared to the control. Results revealed that the highest weight gain (5.92 gm), percent weight gain (63.65%), length increment (1.47cm), percent length increment (31.68%) SGR (1.18) and better FCR (1.98) were recorded in T2. Considering the higher growth rate, it is recommended to use MOC (20 %, 200 g/kg diet) as a non-conventional fish feed ingredient.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
433
445
https://ejabf.journals.ekb.eg/article_202041_bfeaf4eee0c55d9f0aac9acf645b2504.pdf
dx.doi.org/10.21608/ejabf.2021.202041
Impact of Food Values of Dried Orange Peel in Feeding the Nile Tilapia
Susan
H. Fadda et al.
author
text
article
2021
eng
The present study was conducted to evaluate the influence of three different levels of yellow corn replacer (dried orange peel) which contained high-quality nutritional compounds for tilapia feeding to enhance fish performance. The inclusion levels of dried orange peel (OP) were 10, 20, and 30 percent besides the control. Fourteen weeks feeding experiment was carried out with mean initial body weight (16.83 ± 0.12 g). The best growth performance parameters, feed utilization, apparent protein digestibility, and blood measurements were recorded for the fish fed moderate level of OP (20%), followed by the third level (30%). To attain the best fish performance and save about 30% of the yellow corn cost, the dried orange peel powder is recommended to be used in tilapia feed.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
447
461
https://ejabf.journals.ekb.eg/article_202085_c14cd22f6576fc280eb86ccc2a9541b6.pdf
dx.doi.org/10.21608/ejabf.2021.202085
Stock identification of the Reba carp, Cirrhinus reba: Insight into conventional and truss network-based morphometrics
Md. Sarower
E-Mahfuj et al.
author
text
article
2021
eng
The floodplains and ox-bow lake located in the south-western region of Bangladesh is currently facing a remarkable decrease in the number of their wild fish stock. Identification of fish stock along with wild and near-threatened fish conservation management is highly crucial. Samples of wild Cirrhinus reba were gathered from Bergobindapur Boar, Jhapa Baor, and Bornir Beel. The stock status of wild C. reba was assessed utilizing conventional and truss network-based morphometric examinations. Discriminant function analyses (DFA), univariate analyses were used. Univariate statistics (ANOVA) showed six out of eight conventional morphometric characters and eleven out of the twenty-two truss-based morphometric characters impressively exhibited significant differences among specimens. Two discriminant functions (1st and 2nd DFs) for both truss and morphometric measurements produced by the (DFA). In DFA, stocks are isolated with a lower extent of overlapping in both truss and morphometric measurements. This breakthrough proposed that there was partial isolation among the three stocks. Due to various hereditary origins, morphological variation among the stocks was noticed. These morphological differences are crucial in making the right decisions for proper management and conservation, as well as mass seed production, to ensure their long-term viability.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
463
478
https://ejabf.journals.ekb.eg/article_202090_add545efb49067d596911cda209d5114.pdf
dx.doi.org/10.21608/ejabf.2021.202090
A taxonomic review of the aquatic beetles (Hydraenidae: Coleoptera) from Egypt, with two new records
Ahmed
R. Ismaieel et al.
author
text
article
2021
eng
The family Hydraenidae from Egypt is revised. As a result, 17 species belonging to the three genera: Hydraena Kugelann, 1794; Limnebius Leach, 1815andOchthebius Leach, 1815and the two subfamilies: Ochthebinae and Hydraeninae are now recognized, including two new records, Hydraena arabica Balfour-Browne, 1951 and Ochthebius micans Balfour-Browne, 1951. Taxonomic keys are provided for the identification of the subfamilies, genera, and species. In addition, a diagnosis, a list of material examined, and both local and world distribution of each species are provided. Also, a map of species' distributions in Egypt, photographs of the habitus and genitalia of some species are included.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
479
497
https://ejabf.journals.ekb.eg/article_202298_17d83f7aaf8b0a7ac41594155615192f.pdf
dx.doi.org/10.21608/ejabf.2021.202298
The relationship between the development of the morphometric characteristics and the variances of the vegetation cover’s density during the last fifty years at the downstream of Wadi Allaqi Biosphere Reserve, Aswan, Egypt
Ahmed
El-Mezayen et al.
author
text
article
2021
eng
This study was conducted to detect the development of the morphometric characteristics downstream of Wadi Allaqi Biosphere Reserve (WABR) via the successive flood years and the impacts on the subsequent changes in the dominating vegetation cover’s density. The downstream part of Wadi Allaqi is commonly termed Khor, which refers to the lateral extensions branched from the water body of Aswan High Dam Lake or what is commonly named Lake Nasser. Khor Allaqi is regarded as the biggest khor amongst the forty-two khors of Aswan High Dam Lake (AHDL) which was created after the construction of Aswan High Dam (1960– 1970). The geomorphologic units which predominate at the study area and its nearby vicinity were identified and classified in the current research. The outcomes of the present study reflected that the flood years (1999, 2008, and 2019) witnessed the highest values of water accretion distances inside Khor Allaqi and were estimated to be 55.4 m, 53.2 m, and 54.4 m, respectively through applying the “History Tool of Google Earth Pro software”. The discrepancies in the woody vegetation cover’s densities via the flood years are combined with the successive changes of the amounts of the rainfall - as a major parameter of climatic changes - basically on the Ethiopian plateau, in addition to the considerable thickness of the flood plain soil overlying the basement rocks distinguishing Wadi Allaqi. The land cover changes of the scattered floristic species of shrubs individuals were calculated by applying the “Calculate Area Tool of Arc GIS 10.2 software” on the supervised LANDSAT ETM+ satellite image. It was proved that the woody cover expanded and reached 17.5 km2 in the flood year 2019/ 2020.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
499
509
https://ejabf.journals.ekb.eg/article_202614_9414eb7b92b32367c59247f263700ddc.pdf
dx.doi.org/10.21608/ejabf.2021.202614
Diversity and Density of Macrobenthic Invertebrates Associated with Macrophytes in the El-Rayah El-Nasery and El-Rayah El-Behery, Nile River, Egypt
Reda
E. Bendary
author
Shaimaa
M. Ibrahim
author
text
article
2021
eng
A hydrobiological investigation of macrobenthic fauna was seasonally conducted to address El-Rayah El-Nasery and El-Rayah El-Behery from spring 2014 to winter 2015. A total of 52 species were recorded belonging to three phyla. and represented by 33,438 and 12,066 individuals/m2 in both rayahs, respectively. Arthropoda was the most predominant (30 species), followed by Mollusca (15 species) and Annelida (7 species). Station- N8 recorded the highest density and diversity, while the lowest abundance and species number of macrobenthic fauna were found in station- B6. The latter station was proved to be contaminated with organic waste originated from ElRahawy drain. The diversity and density of macrobenthic fauna were higher in El-Rayah El-Nassery compared to El-Rayah El-Behery due to organic pollution in the latter flowing from the Rosetta Branch after the confluence with El Mahmoudia canal.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
511
526
https://ejabf.journals.ekb.eg/article_203279_2c95dadcabaa8e4110147e0bed3877bb.pdf
dx.doi.org/10.21608/ejabf.2021.203279
Multilinear Regression among the Zooplankton Community Counts, Water Quality Parameters and Nutrients Input under Biofloc System Conditions
Rania
S. Mabroke et al.
author
text
article
2021
eng
A 70-day experiment was carried out to estimate mathematical equations that describe the effect of water quality and nutrient input on different zooplankton community count under biofloc conditions. The experiment was designed to deliver three diets with different dietary C/N ratios (8.8, 11.5 & 12) by manipulating the dietary protein (CP) and/or dietary lipid (L). The three diets were; control diet (C; 30% CP, 8% L), P23L8 diet (23% CP, % 8 L) and P23L10 diet (23% CP, 10% L). Control was the only treatment supplemented with an external carbon source (starch) to reach a C:N ratio of 10:1. The control treatment with high dietary protein level showed the highest count for different zooplankton groups, especially for total Protozoa. Protozoa taxa showed a significant regression model (R2adjusted= 0.814, P<0.001) relation with both TSS and nitrogen input. While, the total rotifers showed no correlation with any of the independent variables except for a polynomial relation with Alona intermedia,(P= 0.01). The only cladoceran species recorded in the water samples was Alona intermedia and it showed a significant regression model (R2adjusted = 0.363, P<0.001) with Phosphorus input and alkalinity. Phosphorus input and alkalinity seemed to explain 56% of the copepods count (P=0.003). Ostracoda species showed a significant positive relationship with both energy input and Protozoa species of Centropyxis aculeate ( R2adjusted =0.302 P= 0.003). It could be concluded that alkalinity, TSS, and mineral input are the major variables that affected the zooplankton community density, especially the large-sized groups.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
527
539
https://ejabf.journals.ekb.eg/article_203286_1dc1aae284aaa6a32dd699ea45169e34.pdf
dx.doi.org/10.21608/ejabf.2021.203286
Effect of Heavy Metals Contamination on Biochemical Parameters of the Nile Tilapia from Different Fish Farms
Hala
Elshahat Ghannam et al.
author
text
article
2021
eng
This study is concerned with the contamination of heavy metals and its effect on biochemical parameters and enzyme activity of the Nile tilapia collected from three fish farms. For this reason, the physical and chemical parameters of farms water were examined. Also, heavy metals (Zn, Cd, Pb, Fe, and Cu) were measured in water, fish blood, and sediment collected from the farms under study. The results of pH in the three farms EL-Galini, Locanda, and EL-Bats were 7.95, 8.03, and 8.06, respectively where, dissolved oxygen were 5.9, 7.2, and 6.0 (mg/l). The values of heavy metals in water showed relative variation Fe>Zn>Cu>Pb>Cd in all three different farms. For sediment EL Galini farm have the highest value for all the examined heavy metals followed by Locanda and EL-Bats farm. The results showed a significant increase in levels of (Random blood sugar), and (Alkaline Phosphatase) with P-value 0.004, 0.002 respectively in both Locanda and EL-Bats farms when compared with EL Galini farm. Also, there was a significant decrease in levels of creatinine, (Creatinine Kinase) and (Aspartate Transferase) with P-value 0.02 and 0.05 for creatinine, <0.001 and <0.001 for CK and <0.001 and <0.001 for AST, respectively in both Locanda and EL-Bats farms when compared with EL Galini farm.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
541
552
https://ejabf.journals.ekb.eg/article_203290_ad9346cf374b316282c05baea9a1f33d.pdf
dx.doi.org/10.21608/ejabf.2021.203290
Temporal analysis of the distribution of thynnus thunnus in relation to environmental factors along the Algerian coast
Firad
Benyahia et al.
author
text
article
2021
eng
The distribution of the large pelagic Atlantic bluefin tuna extends from the North Atlantic Ocean and its adjacent seas, particularly the Mediterranean. In this study, thegeo-referenced fisheries data were integrated with remotely sensed oceanographic datasets to answer the suggested question; what are the environmental determinants that contribute to the temporal distribution of bluefin tuna along the Algerian coast? This tuna-environment research was conducted with three objectives: i) to understand the behaviour and distribution of tuna in the face of variability in environmental factors, ii) to assist the scientist in stock management, and iii) to assist fishermen in fishing their short-term quotas and to assist the competent authorities in controlling the fishermen. The results of this study proved that the environmental factors (temperature, salinity, chlorophyll a, current speed, wave height, oxygen, and nitrate) are the determining factors of bluefin tuna distribution along the Algerian coast. Multiple linear regression analysis defined the equation of the best linear correction model, chlorophyll a, dissolved oxygen, salinity, and temperature, explaining 70.3% of the variability in the total length of bluefin tuna.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
553
571
https://ejabf.journals.ekb.eg/article_204224_15e4157ab673e00da96506fb190baa44.pdf
dx.doi.org/10.21608/ejabf.2021.204224
Reproductive Dynamics of Indian Squid, Uroteuthis duvaucelii (Cephalopoda: Loliginidae) of the Suez Gulf, Red Sea, Egypt
Wessam
E. R. Elsayed et al.
author
text
article
2021
eng
The overall pattern of the reproduction of the commercially important Indian squid, Uroteuthis duvaucelii in the Suez Gulf was described in terms of sex ratio, mantle length at 50% maturity, gonado-somatic index as well as the morphological and histological changes in gonads of both males and females. The overall sex ratio (M: F) was 1.7:1 showing the dominance of males over females during the study period. Males grow to a larger size compared to females (maximum ML= 25.3 and 19.4 cm for males and females, respectively). But, females reach sexual maturity earlier than males (ML50% = 13.5 and 10 cm ML for males and females, respectively). The gonado-somatic index values increased with the gonad maturation, having 2 beaks during spring (in April for both males and females) and autumn (in November for females and in October for males) and declined thereafter during winter. Thus, the reproductive period occurs frequently throughout the year, especially in warm months. Four stages (I - IV) of maturity were recognized according to their macroscopic appearance. No spent (stage V) individuals were observed morphologically throughout the study. The histological evaluation showed five stages (I – V) of gonadal development in males’ testis. While six stages (I – VI) were determined in the female’s ovary. The appearance of various stages of gonadal development at the same time in most histological slides indicates that the spawning strategy in this species is iteroparous and spawns partially throughout the year. These findings regarding the reproductive dynamics of U. duvaucelii in the Suez Gulf are very important for preserving its stock and regulating its fishing strategies
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
573
589
https://ejabf.journals.ekb.eg/article_204360_98f6feb90e8d5615a78a6aeaa14650f9.pdf
dx.doi.org/10.21608/ejabf.2021.204360
Reef-building Ficopomatus enigmaticus and associated Polychaetes on artificial concrete blocks along Mediterranean seaside, Egypt
Ahmed
F. Salama et al.
author
text
article
2021
eng
This work aimed to study the seasonal and spatial variations in the structure and abundance of the Polychaetes populations associated with the reef-building Ficopomatus enigmaticus on artificial concrete blocks(ACBs) which were constructed along the Mediterranean seaside to solve the crucial impacts of climate changes and sea level-rise. The specimens were seasonally collected from the ACBs during the period extending from spring 2016 to winter 2017. During this study, two Polychaetes species were associated with Ficopomatus enigmaticus viz Alitta succinea and Perinereis cultrifera. Ficopomatus enigmaticus was the eudominant species recording a percentage of 72.5 of all the collected Polychaetes, while Alitta succinea was subrecedent forming 1.0 %. Additionally, Perinereis cultrifera dominated by 26.4%. Six October sites showed the highest average density of the studied species all year-round. Alternatively, the lowest average densities were detected in different sites and seasons as follows: in NIOF in spring and autumn; in Baltim in summer, and in Beer Masoud in winter.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
591
605
https://ejabf.journals.ekb.eg/article_204363_09ab55300888f8a7b82848e312e297cf.pdf
dx.doi.org/10.21608/ejabf.2021.204363
The Seasonal Assessment of Heavy Metals Bioaccumulation in European Seabass (Dicentrarchus labrax) Inhabiting Damietta Fishing Harbor, Egypt
Ali
A. Al-Halani et al.
author
text
article
2021
eng
The current study was conducted to investigate the bioaccumulation of copper (Cu), zinc (Zn), manganese (Mn), nickel (Ni), cadmium (Cd), lead (Pb), chromium (Cr), and iron (Fe) in the liver and the muscle tissues of European seabass (Dicentrarchus labrax) collected in winter and spring (2021) from Damietta fishing harbor and the surrounding area, Damietta, Egypt. For this purpose, four samples of water and fish were collected from four sites. Besides, human health risk was assessed using estimated daily intake and target hazard quotients. The bioconcentration factor of the above-mentioned heavy metals was also determined. Although the bioaccumulation of all heavy metals in fish was lower than the permissible limits mentioned by FAO and WHO, their bio-concentrations showed remarkable differences among seasons and fish organs. The bioaccumulation of heavy metals in the liver was higher than that found in muscles with respect to all metals. Spring recorded higher bioaccumulation compared to winter considering Mn, Cd, Cr, and Fe. The concentration of heavy metals in water in winter was in order as follows: Ni >Fe > Zn > Cd > Cr > Pb > Cu > Mn, while in spring, it was Ni > Fe >Pb > Zn > Cr > Cd > Cu > Mn. On the other hand, the bioaccumulation of these metals in fish organs was shown in the following order: Fe > Zn > Mn > Pb > Cu > Ni> Cr > Cd. In conclusion, the human risk assessment indicated that European seabass in the present study was safe for human consumption.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
607
626
https://ejabf.journals.ekb.eg/article_205025_bc7e4938d7437d9f20bb90b0f80736d0.pdf
dx.doi.org/10.21608/ejabf.2021.205025
Utilization of Taro Leaves in Diet of the Nile Tilapia Oreochromis nloticus
Raky
F. Attalla et al.
author
text
article
2021
eng
Eighty-four days feeding trial was conducted to address the growth performance, feeding efficacy rate, body indices, and biochemical parameters of the mono-sex Nile tilapia, when fed different substitution levels of soy and maize with dried taro (Colocasia esculenta) leaves, compared to a control diet. This trial was followed by a 14-days fish digestibility experiment. All treatments were duplicated by using two equal cement basins with 5 equal parts containing 100 fish per each with a recorded initial weight (23.39±0.43g). All growth responses were significantly affected, whether in the four examined fish groups or the control group (P<0.05). Compared to the control, the lowest muscle lipid and the highest muscle protein contents were recorded in fish fed diet 3, (20 % boiled soybean +40% yellow corn). A significant improvement was detected in the plasma total protein and the immunoglobulin (p < 0.05) of the tilapia fed the four examined diets when compared to the control. Similarly, the highest protein digestibility was recorded for the 4 aforementioned fish groups (p < 0.05). Meanwhile, an insignificant survival rate was observed for both groups; the treated and the control. Furthermore, the liver index and liver composition were significantly affected with regard to the tested fish groups when compared to the control. Results indicated that soy and corn substituted with taro leaves, which contain the important amino and fatty acids required for fish, can significantly promote growth and may provide the market with a low cost-effective and eco-friendly fish diet as well.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
627
643
https://ejabf.journals.ekb.eg/article_205022_0e3526ec1752302820cf415b3a72c5b0.pdf
dx.doi.org/10.21608/ejabf.2021.205022
Effects of different dietary protein and lipids levels on growth performance and digestive enzymes of the rabbitfish (Siganus rivulatus), reared in well water
Mohamed
El-Sayed Salem et al.
author
text
article
2021
eng
A trial has been evaluated the effects of different levels of dietary protein and lipid on the growth performance, feed utilization, and digestive enzymes of the rabbitfish (Siganus rivulatus). Four diets were formulated as follows: diet 1 (P30L6) (protein 30% and lipid 6%), diet 2 (P30L12) (protein 30% and lipid 12%), diet 3 (P40L6) (protein 40% and lipid 6%) and diet 4 (P40L12) (protein 40% and lipid 12%). Diets were fed to the Rabbitfish (S. rivulatus) juveniles (0.32 ± 0.16 g /fish) for 56 days. Fish fed on P40L12 and P40L6 diets showed the best growth, followed by P30L6 and P30L12. Better feed utilization was obtained in fish-fed diets with 40% protein compared to 30% protein regardless of the dietary lipid levels. The highest value of protease has been recorded in P40 fish groups with both lipid levels followed by P30L12. Fish groups of P30L6, P30L12, P40L6 to P40L12, respectively, showed an increase in lipase upward. The highest result of amylase was detected in P30L6 followed by P30L6 and P40L6. The highest value of glutamate dehydrogenase was given in P30L6 followed by P30L12. Thus, the P40L6 diet is suitable for the optimal growth performance and digestion functions of the Rabbitfish (S. rivulatus) juveniles.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
645
660
https://ejabf.journals.ekb.eg/article_205026_32f2b8ae23d0e628006e029c99d39bb4.pdf
dx.doi.org/10.21608/ejabf.2021.205026
The photosensitizing activity of different photosensitizers irradiated with sunlight against aquatic larvae of Culex pipiens L. (Diptera: Culicidae)
Ahmed
A. El-Mehdawy et al.
author
text
article
2021
eng
The response of Culex pipiens early 3rd instar larvae to three photosensitizing dyes (Toluidine blue O, Methylene blue, and Rose Bengal) was studied under laboratory conditions. Despite lack of toxicity in dark and with exposure to only sunlight, C. pipiens third instar larvae were highly sensitive to the three tested photosensitisers with 20 minutes of sunlight irradiation. Larvae showed the most sensitivity to Rose Bengal (RB) with LC50 values of 1.07, 1.19, 1.35, 1.65µM, and LC90 values of 3.88, 3.98, 4.19, and 4.51µM. Also, less sensitivity to methylene blue (MB) was recorded with LC50 values of 2.70, 2.79, 2.99, 3.08µM and LC90 values of 4.82, 4.90, 5.04, and 5.22µM. In addition, the least sensitivity was recorded by larvae towards toluidine blue o (TBO) with LC50 values of 3.30, 3.39, 3.58, and 3.87µM and LC90 values of 5.23, 5.32, 5.57, and 5.96 µM, respectively. Results showed that photosensitizers could be an excellent replacement for the traditional insecticides avoiding their negative impact on the environment.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
661
670
https://ejabf.journals.ekb.eg/article_205672_f9c3db486cf8c106bbbed3e7de974b7a.pdf
dx.doi.org/10.21608/ejabf.2021.205672
Comparative histological and functional studies on the brain of some freshwater fishes during prespawning and spawning seasons
Dalia
A. Sabry et al.
author
text
article
2021
eng
Four adult female freshwater teleost fish species; Malapterurus electricus, Synodontis schall, Labeo niloticus, and Lates niloticus (n=7) were collected in both pre-spawning and spawning seasons. The brain was dissected and the cerebellum was separated. The cerebellum was examined histologically by light and transmission electron microscope. cerebellar immunohistochemical stain was performed to investigate follicle-stimulating hormone (FSH) and glial fibrillary acidic protein (GFAP) for the assessment of the level of sex hormones and oxidative stress respectively. Biochemical measurements were executed to measure the brain contents of serotonin, dopamine and fatty acids and the activity of aromatase, Glucose 6 phosphate dehydrogenase (G6PD), Adenosine triphosphate (ATP) and lactate dehydrogenase (LDH). During spawning season, the cerebellar layers appeared fragile except of Malopterurus electricus compared to prespawning season. The cerebellar cortex of the studied fishes with the exception of Malopterurus electricus, is extremely vulnerable to oxidative stress during spawning season. In Synodontis schall and Lates niloticus, many of the cerebellar neurons have lost their myelinated coating. In Lates niloticus, some Purkinje cells exhibited fragmented rough endoplasmic reticulum and some granular cells appeared damaged and pyknotic, while others were surrounded with nerve fibrous sheath. Dense expression of FSH was evidenced during prespawning season, which refers to the increased level of sex hormones if compared with the spawning period. In the studied species, serotonin levels increased during prespawning season while dopamine levels decreased. The spawning period appeared to require higher energy, which was assessed by increasing activity of brain ATPase and G6PD. While LDH activity decreased during spawning that may reflect the absence of some myelinated sheaths. It was concluded that the brain of the studied species exhibited high sensitivity to hormonal alterations during pre-spawning and spawning seasons except for Malapterurus electricus that showed the highest resistance.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
671
695
https://ejabf.journals.ekb.eg/article_205673_64dedfc16aef566822e2ca76bd729a6a.pdf
dx.doi.org/10.21608/ejabf.2021.205673
Heavy metals in the polychaete Hediste diversicolor, from Lake Burullus, Egypt
Rasha
Hamdy et al.
author
text
article
2021
eng
Lake Burullus is a stressed wetland on the Egyptian Mediterranean coast, impacted by industrial, domestic and agricultural wastes. The polychaete Hediste diversicolor was used as a biomarker of some heavy metals in the lake, particularly Cd, Cu, Pb, and Zn. The levels of these metals were measured in the worms and surrounding sediment. The results indicated wide variation in the contents of heavy metals in the sediment and worms, with higher levels in the worms. The experimental work showed that Hediste diversicolor displayed a pronounced capacity to accumulate Cu and Pb, while the release of metals by the worms occurred at a lower rate. Lead and Copper showed similar mortality to the test-worms (51.7% and 51.6%, respectively) after 7 days at 500 ppm for each metal.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
697
719
https://ejabf.journals.ekb.eg/article_205898_eff6b3ffdc1850c0307da4b2c79daf6b.pdf
dx.doi.org/10.21608/ejabf.2021.205898
Larvicidal activity and ultrastructural abnormalities in the ovaries of the housefly “Musca domestica” induced by the soft coral “Ovabunda macrospiculata” synthesized ZnO nanoparticles
Ahmed
I. Hasaballah et al.
author
text
article
2021
eng
Compared to micro and macroparticles, nanoparticles possess distinctive properties. Soft corals are appreciated marine sources with promising biological and chemical diversity. This study aimed to evaluate the effect of eco-friendly synthesis of Zinc oxide nanoparticles using Ovabunda macrospiculata (Om-ZnO-NPs) as an insecticidal agent. In this trial, the ultrastructural abnormalities induced in the ovaries of the housefly, Musca domestica adult females were investigated. Synthesized zinc oxide nanoparticles (ZnO-NPs) were characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier transform infra-red (FTIR) spectroscopy. Morphologically, ZnO-NPs were semi-spherical in shape with particles diameter ranging from 20.4 to 21.3 nm. Structurally, XRD data showed that ZnO-NPs were crystalline in nature. The existence of chemicals required for the reduction of zinc oxide was confirmed by FTIR spectral analysis. Data obtained showed promising larvicidal activity, where synthesized Om-ZnO-NPs showed 2-3 folds higher larval mortality percentages than the crude extract at almost all concentrations tested. The recorded LC50 values were 49.061 and 22.595 ppm, while the LC90 values were 91.093 and 43.393 ppm for the crude extract and Om-ZnO-NPs, respectively. Additionally, Om-ZnO-NPs severely reduced the fecundity and egg-hatchability of treated females compared to those treated with the crude extract or the untreated females. Ultrastructural investigations revealed that crude extract induced abnormalities in tested ovaries and this effect was much more pronounced in those females treated with Om-ZnO-NPs. Generally, the obtained results suggest that coral-mediated synthesis of ZnO-NPs is more feasible than the eco-friendly synthesis of ZnO-NPs with improved properties.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
721
738
https://ejabf.journals.ekb.eg/article_206249_65d4a8adfe9e7ee9671470da85ac35ea.pdf
dx.doi.org/10.21608/ejabf.2021.206249
The update of immigrant Red Sea fish of Egyptian Mediterranean waters during (2013-2021)
Samir
Ibrahim Rizkalla
author
Rasha
Ali Heneish
author
text
article
2021
eng
The current study was conducted to address thirty nine immigrant fish species collected from the Red sea and recorded in previous studies in seven regions of the Egyptian Mediterranean waters during the period from 2013- 2021. A total number of 13212 fish specimens were determined in this study. They were divided according to their importance in the fish markets into economic (18) and non-economic species (21). Thirteen new fish species were identified in the present work whereas 15 fish species in the checklist given by Halim and Rizkalla (2011) were not found in the study area within the study period. The fish occurrence was determined in the different studied regions (Port- Said, Damietta, Abu Qir, Alexandria, El-Agami, El- Dabaa, and Marsa Matruh). On basis of occurrence, fish species were classified into rare, frequent and abundant. With an occurrence percentage of 49.1 including all fish species, Port- Said (North opening of Suez Canal) was recorded the highest among all studied regions, followed by Alexandria (41.9%), Abu-Qir (5.2%) and Marsa Matruh (3.7%). Considering species dominance in different regions; Alepes djedaba and Siganus rivulatus were the most dominant economic species found in Port Said, while Nemipterus randalli and Sargocentrum rubrum were abundant in Alexandria. In addition, Nemipterus randalli was detected in Abu-Qir area whereas in Marsa Matruh, Upeneus pori was the most abundant. In conclusion, this study was established to determine the distribution of Lessepsian species along the seven studied regions of the Egyptian Mediterranean waters during the period from 2013 to 2021.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
739
753
https://ejabf.journals.ekb.eg/article_206370_d1305a8c2d523e1ee8e8236b04a0b027.pdf
dx.doi.org/10.21608/ejabf.2021.206370
Composition and Abundance of Macrobenthos, using two sampling methods, in El Rayah El Tawfiky, River Nile, Egypt
Reda
E. Bendary et al.
author
text
article
2021
eng
During the period extending from spring 2014 till winter 2015, macrobenthic invertebrates were collected from El Rayah El Tawfiky using two sampling methods; Ekman grab and macrophyte sweep netting. To address the composition, distribution and abundance of the species under study, thirty nine species were recorded, representing the sampling methods (20,505 and 3557 individuals/m2respectively). Macrobenthic invertebrates collected belong to three phyla; namely, Arthropoda, Annelida and Mollusca. Significant differences were detected in community composition, distribution and abundance of macrobenthos. Those differences were attributed to the varieties of the sampling methods, the seasons and the sites as well. In samples collected by a grap, the dominance of Annelida species was observed, while the Arthropoda species prevailed in samples collected by macrophytes. The highest density was detected at stations VI and V in a grap and macrophyte sampling, respectively. Adversely, its lowest was determined at station VII with respect to both sampling methods. For the grap sampling, spring was the best season, whereas summer was the most preferred for macrophyte sampling. Results showed that the study area suffers from several sources of pollution, and the tolerant species such as Chironomidae larva and Limnodrilus udekemianus were the most dominant. Hence, a regular monitoring program is recommended to allow the detection of any future changes.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
755
767
https://ejabf.journals.ekb.eg/article_206371_d278f819617e500e68f32dffcc614015.pdf
dx.doi.org/10.21608/ejabf.2021.206371
Biodiversity and Distribution of Macrobenthic Invertebrate Community in Lake Nasser, Egypt
Marian
G. Nassif
author
text
article
2021
eng
Lake Nasser is a vast reservoir in southern Egypt and northern Sudan and one of the largest man-made lakes in the world. It has vital importance to Egypt because of the safe water supply of the country. Therefore, the water quality of the lake must be continuously monitored to cope with the challenges of water scarcity and a healthy water supply. Thus, fifteen stations were selected to represent the different habitats of the whole lake in March and July 2019. 9 species of macrobenthic fauna were identified, representing three phyla: Annelida, Arthropoda, and Mollusca with percentages of 74.62%, 15.41% and 9.97%, respectively. The total recorded density was 863 org./m2 and the highest densities were recorded in the southern sectors of the lake. Summer (flood season) exhibited the highest population density.The western station of EL Madiq sector showed the highest Shannon Weaver diversity index (H′= 1.55), which could be attributed to the dominance of 4 species of arthropods, and exclusively, the dominance of nymphs of Ischneura. Contrarily, the middle stations of Wadi Abyad and Aswan sectors recorded the least diversity Shannon Weaver index value (H′= 0.21 and 0.27, respectively) which may be attributed to the nature of the sediment which led to the absence of all mollusk species and the presence of one annelid species (Limnodrilus sp.) and one insect species (Chironomuslarvae). The present study revealed that the number of species decreased dramatically to 9 species compared to 15, 43, 39, and 24 recorded in 1987, 1993, 1995, and 2014, respectively. It is recommended to force an effective legal framework to mitigate pollution in Lake Nasser.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
769
786
https://ejabf.journals.ekb.eg/article_206680_5ad9dd884e39aae97d26d9d68d044788.pdf
dx.doi.org/10.21608/ejabf.2021.206680
Length-weight relationships and condition factors of five marine fish species collected from the Meghna River estuary of Bangladesh
Md. Refat
Jahan Rakib et al.
author
text
article
2021
eng
Length-weight relationships (LWRs), condition factor (K), and relative condition factor (Kn) were estimated for 505 individuals. The species were: Awaous guamensis, Taenioides cirratus, Mysus gulio, Polynemus paradiseus, and Lates calcarifer from the Meghna River Estuary of southern Bangladesh collected between July 2018 and June 2019 by using traditional fishing gear (e.g. Dragnet, Purse net, Fixed Purse Net and Gill net). Total length (TL) was measured to 0.1 cm, and whole-body weight (BW) was taken to the nearest 0.1 g for each individual. The results of the length-weight relationship showed that the allometric coefficient, b values ranged from b= 1.48 (Lates calcarifer) to b= 3.28 (Awaous guamensis). The results revealed that Awaous guamensis showed positive allometry, whereas the other studied species showed negative allometric growth. In this study, the mean values of the relative condition factor (Kn) were recorded as close to 1.0, thus the condition of the Meghna River Estuary was good for the growth of those five marine species. Hence, the present study proved to assist the management of those five endangered species in the Meghna River Estuary ecosystem.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
787
798
https://ejabf.journals.ekb.eg/article_206880_277736c107d76265c1e6f54c38ed89ef.pdf
dx.doi.org/10.21608/ejabf.2021.206880
Statistical optimization of chitosan production using marine-derived Penicillium chrysogenum MZ723110 in Egypt
Noura
A. El -Far et al.
author
text
article
2021
eng
Fungal chitosan is highly demanded because of its better physico-chemical characteristics compared to crustaceans’ chitosan. In the current study, a marine-derived fungus was isolated from the Mediterranean Sea in Egypt and was identified according to microscopic and molecular characteristics of Penicillium chrysogenum MZ723110. The fungal strain was used for chitosan extraction. The resultant chitosan was characterized by Fourier transform infrared spectroscopy (FT-IR) analysis and the degree of deacetylation (DD%). Statistical optimization of fungal growth conditions for maximum chitosan yield was done using Plackett Burman design (PBD) and central composite design (CCD). The statistical optimization revealed that the type of fungal culture, peptone concentration, and incubation period were the most significant factors. Upon their optimization, there was a 3.1-fold increase in chitosan yield by P. chrysogenum MZ723110. The yield of chitosan was increased from 4.4% to 7.5 % with DD% equal to 94%. The results of this study proved the importance of optimizing fungal growth conditions for the maximum yield of chitosan.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
799
819
https://ejabf.journals.ekb.eg/article_206881_95ea86614b27fb61375e94f63b178679.pdf
dx.doi.org/10.21608/ejabf.2021.206881
Key Selections for Microalgae, the Indispensable Live Feed in Bivalve Hatchery: A Brief Review
Anita
Tahir
author
Julian
Ransangan
author
text
article
2021
eng
In the current study, bivalve primarily consumed microalgae were addressed in all their developmental stages. Microalgae, an absolute nutrient source of essential phytonutrients and biologically active compounds, are vital for bivalve growth, health and reproduction. However, in natural habitat, its feeding preferences are not limited to only microalgae, but also include bacterioplankton, microzooplankton, detritus, protist as well as non-nutritive and dissolved organic materials. In contrast, bivalve feeding under controlled hatchery conditions relies on selective microalgae species for broodstock conditioning, larval and post-larval rearing. These activities mainly targeted the high production of seed, also known as spat which depends on the quality and quantity of the microalgae. Thus, thorough preparation and selection of microalgae are critical for the success of hatchery operations. This paper provides a brief overview of the current literature and understanding of microalgae selection criteria as live feed in bivalve hatchery.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
821
846
https://ejabf.journals.ekb.eg/article_206882_b430d17e04a6d1e10b85823a884b96bf.pdf
dx.doi.org/10.21608/ejabf.2021.206882
How does weaning anticipation affect gilthead seabream (Sparus aurata) larvae digestive capacity, growth and survival?
Ahmed
Md. Salem et al.
author
text
article
2021
eng
The gilthead seabream is one of the most important Mediterranean aquaculture fish species. It is important to study the ability of fish larvae to grow and survive with respect to their feed. The attempt to shorten the period consumed by fish larvae depending on live food would reduce the production cost. Hence, the current study aimed to evaluate the effect of anticipating weaning as early as 27 days old on fish digestive capacity, intestinal histomorphology, growth, and survival. Fish larvae were weaned at 27 (W27), 35 (W35), and 43 (W43) days after hatching (DAH), with a co-feeding of 5 days. Samples were collected at the weaning day (T0), 1 week (T1), and 4 weeks after the weaning (T4) to determine their digestive enzymes. Sea bream larvae weaned at different age stages exhibited similar growth and survival rates, aligned with normal intestinal morphology. Regardless of their weaning age, the experimental groups showed an identical pattern of digestive enzyme activities variation. W27 fish were able to recover, and at 70 DAH digestive enzymes activities were similar among experimental groups. These results indicate that fish age/size influences the magnitude of digestive enzyme activities. Weaning gilthead sea bream at 27 DAH can have a high economic advantage on hatcheries by reducing the production and labor costs of live feeds production.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
865
879
https://ejabf.journals.ekb.eg/article_207172_89ef1fb546593a8be4dd5eb8e08c370a.pdf
dx.doi.org/10.21608/ejabf.2021.207172
A new record of the freshwater bivalve Pisidium amnicum (Family: Sphaeriidae) from Qena Governorate, Upper Egypt
Ahmed
S. Moustafa
author
Elamier
H. M. Hussien
author
text
article
2021
eng
Family Sphaeriidae was neglected in North Africa and studies on this group of benthic organisms are very limited compared to other taxa. The originality of this work is drawn from the fact that this was the first time to record a member of the Family Sphaeriidae in Egypt. In addition, to our knowledge, this is the first record of Pisidium amnicum in Egypt. The current work was conducted to enhance the faunal knowledge and determine the actual conservation status of Genus Pisidium (Pfeiffer, 1821), Pisidium amnicum (Müller, 1774), which was collected from the River Nile in Qena Governorate. The shell of these individuals is up to 11 mm I length; it inhabits slow-flowing rivers; has a subtriangular shape in the adult; ornamented with very fine striations, giving it a shiny aspect. It has a thick appendicular at the top of each valve and numerous pores covering the internal surface. The hinge plate is arched but hardly or not at all thickened. These bivalves also have a relatively small outer demibranch. Although externally, all the age classes resemble each other, the shape of their ligament-pit is different; it is either long or narrow. Data in this context is highly required to address the impact of the human increasing pressure on habitat loss and anthropogenic transformation of habitats of Pisidium amnicum in the Mediterranean biodiversity.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
881
892
https://ejabf.journals.ekb.eg/article_207404_fc567de5ee3dd33756695609e1a3b7b7.pdf
dx.doi.org/10.21608/ejabf.2021.207404
Sensory quality and its economic losses for Freight Fish Consignments
Abdelrahman
H .A. et al.
author
text
article
2021
eng
Fish, in international commerce, constitute an important food commodity due to the increasing demand for protein with high biological value. This study was conducted to evaluate the sensory quality of air freight fish at Kuwait Airport during a period from January 2019 to April 2020. The number of fish consignments reached 37193 packages, with a total weight of 7462332 kg. Considering source (A), zobaidy fish (Stromateus linnaeus) was imported with 251640 kg, while the imports of shrimp (Peneaus japonicus) were 8872 kg. For source (B), Arabian grouper reached 131760 kg; green snapper represented 50760 kg; imported small grouper was 9720kg; sobaity bream was imported with 39240 kg; red snapper with 96840kg; carnax with 135720 kg, and Spanish mackerel with 4100 kg. While, in the source (C), the imported grey mullet was 13680 kg. Fish packages were rejected based on the sensory criteria, such as odour, secretions, and rigidity, besides gills and eye characteristics. The rejected packages of zobaidy fish were 2096 (16.7 %); those of the Arabian grouper was 1941(29.5%); of green snapper was 253(10.0%); of small grouper was 46(8.2%); of sobaity bream was 18(1%), of red snapper was 36(0.7%), of caranx was 66 (1%), of Spanish mackerel was 26(6.5%), and of the grey mullet was 48(7.0%). With respect to sources, the rejected fish packages from source A were 2229; from source, B were 2380, and from source, C was 48. The total economic losses from different sources during the study period reached 571200 KD.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
893
900
https://ejabf.journals.ekb.eg/article_207405_49d6e492d9bacc74e5efe504574b5d61.pdf
dx.doi.org/10.21608/ejabf.2021.207405
Distribution, abundance and diversity of reef fishes in waters of some cities along the northern Egyptian Red Sea coast, Egypt
Mahmoud
M. Maaty et al.
author
text
article
2021
eng
The Egyptian Red Sea coast is characterized by the presence of a few human densities distributed over large areas, aligned with an integrated marine system, whether human or industrial. all of which have a great impact on it. The coast is also affected by the presence of ports, tourism, and commercial fishing activities. Hence, the effect of those factors on coral reef fish's distribution, abundance, and diversity were subjected to a profound study addressing some megacities along the northern Egyptian Red Sea coast (Ras Gharib, Hurgada, Safaga, and El-Qusier), where three stations in each city were surveyed. Adult fishes were counted by visual censuses. A total of 16179 individuals of reef fish species were counted, representing 93 reef fish species, belonging to 26 families. The highest fish abundance was recorded in north Hurgada (HN) with 4432 fishes. The lowest fish abundance was found in middle Hurgada (HM), where only 292 individuals were recorded. The highest diversity (54 species) was recorded in HN, while the lowest (18 species) was detected in HM. Results showed that fishes were most abundant during winter; HN had the highest number of fishes during all seasons, while HM had the lowest number of fishes during spring, summer, and autumn. In addition, HN recorded the highest diversity (53 species) during spring and north Safaga recorded the lowest diversity (only 5 species) during winter. Fishes of family Mullidae were more abundant during winter and labrid fishes were dominant during rest seasons. Labridae and Chaetodontidae were the most diverse families during all seasons of the year.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
901
918
https://ejabf.journals.ekb.eg/article_207877_21118f4c6136131a8e4c5469d36503a8.pdf
dx.doi.org/10.21608/ejabf.2021.207877
Protozooplankton combined with magnetic-EDTA@chitosan nanocomposite as a novel system for fish farms wastewater remediation
Amr
B. Mostafa et al.
author
text
article
2021
eng
In Egypt, most fish farms use water of agricultural drainage originated from agricultural activities that may contaminate farmed fish. This work was conducted to assess a novel wastewater treatment using combined protozooplankton with magnetic-EDTA@chitosan nanocomposite (ME@CS NC), to dwell with high concentrations of heavy metals and ammonia. A highly significant reduction (p < 0.01) was observed in the concentrations of Pb, Mn, Al and Cd on applying the treatment. The estimated decrease percentages were 99.9, 99.6, 98.8 and 93.3, respectively, whereas Ni showed a reduction of 90.3%. Simultaneously, ammonia in wastewater was significantly reduced (p < /em><0.01). Water environmental parameters of EC, pH, TDS, and NO2 were reduced by 2.4, 3.7, 7.4, and 43.3%, respectively, while PO4, and NH3 were reduced by 76.7 and 94.4%, respectively. Moreover, COD, nitrite, nitrate and phosphate physicochemical parameters were significantly reduced (p < /em><0.05), by 41.4, 54.9, 63.3, 64.4%, respectively. Hence, the combined treatment of ME@CS nano-composite and protozooplankton is recommended to be implemented in semi-intensive and modern intensive aquaculture systems to manage less water consumption and attain healthy fish for human consumption.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
919
932
https://ejabf.journals.ekb.eg/article_207878_c3b5ded24fb9d424e9d2f866b8ff605b.pdf
dx.doi.org/10.21608/ejabf.2021.207878
Effect of Aeromonas sobria infection on gills and skin histopathology of the Nile tilapia reared under biofloc and clear water systems
Mohamed
Bakr et al.
author
text
article
2021
eng
This study aimed to investigate the effect of A. sobria infection on the gills and skin histopathology of the Nile tilapia reared in biofloc technology (BFT) compared to a clear water system (CWS). The Nile tilapia fish were divided into four groups: two groups in BFT (control group without infection (BFTC) and A. sobria infected group (BFTT)) and the other two in CWS (control group without infection (CWSC) and A. sobria infected group (CWST)). The infection was done by I/P (intraperitoneal) injection of 0.1 ml of 1.5×108 CFU/ml of A. sobria. The gills histopathology of CWST group showed moderate to severe histopathological alterations; congestion of lamellar blood vessels, mononuclear and eosinophilic leukocytic infiltration, and sloughing of lamellar epithelium; while it only showed mild epithelial hyperplasia in the BFTT group. Skin hyperemia and tail rot were observed grossly without any histopathological alterations in the skin of both BFTT and CWST groups. Total heterotrophic bacterial count in culture water was higher in BFTC group, nevertheless, its count in the fish gut was higher in CWSC group. In both BFTT and CWST groups, after infection, a decrease was detected in the total heterotrophic bacterial count in culture water and fish gut, while it was still higher in BFTT group. At the early stage of A. sobria infection, the gills are severely affected, and its injury may not be observed, paving the way for other diseases. Meanwhile, the skin may show hyperemia grossly without any histopathological alterations. Results of the current study showed that the biofloc system proved its capacity of protecting the gills of the Nile tilapia against A. sobria infection.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
933
950
https://ejabf.journals.ekb.eg/article_208017_fd50f46e29a642e5c86e262b2d31bf7c.pdf
dx.doi.org/10.21608/ejabf.2021.208017
Effect of Endocrine Disrupting Chemicals Exposure on Reproduction and Endocrine Functions Using the Zebrafish Model
Sara
F. Ghanem
author
text
article
2021
eng
Increasing concern has been rising about the number of chemical substances associated with anthropogenic activities that affect the environment as well as the health of humans and wildlife. These chemical compounds can harm the proliferation of aquatic life causing several problems among which a reduction in population density, biodiversity of species and a variation in fish sex are considered. Due to the similarity between the function of hormone receptor systems in human beings and animals, there is a great concern about the possible human health effects. Endocrine-disrupting chemicals (EDCs) are identified as a group of harmful natural and synthetic compounds that are able to mimic endogenous hormones altering their functions, metabolism and biosynthesis. Being lipophilic molecules, many EDCs bind to hydrophobic pouches in steroid receptors, such as the androgen and estrogen receptors, that play a crucial role in vertebrate development and reproduction. Certainly, reproductive dysfunction in fish such as deviated male to female sex ratios, reduced fertility, reproductive tract abnormalities, early puberty, obesity and numerous cancers represent some health effects related to EDCs exposure. EDCs affect a great number of genes transcription, which required the development of new tools to supervise the total EDCs effects. The appearance of immense parallel sequencing for examining gene transcription offers a delicate tool for evaluating the effects of EDCs on humans and vertebrates and elucidates EDCs mode of action. In aquatic life, fish are found to be the principal hazard organisms for EDCs exposure. Zebrafish preserve many developmental pathways similar to those found in humans. Consequently, zebrafish become an important model system to study endocrine disruptors, specifically in the early stages of organs development due to the translucence of their embryos.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
951
981
https://ejabf.journals.ekb.eg/article_208183_5fba2094bf694386ebd9a0ef4f982082.pdf
dx.doi.org/10.21608/ejabf.2021.208183
Physico-Chemical Parameters, Length-Length and Length-Weight Relationships and Condition Factor of the Vulnerable Gudusia chapra in the Kaptai Lake, Rangamati, Bangladesh
Shyamal
Kumar Paul et al.
author
text
article
2021
eng
Fish growth is directly influenced by water quality and the abundance of food in their environment. The aim of this study was focused to determine the length-length, length-weight and condition factor of Gudusia chapra inhabiting in the largest man-made lake in Bangladesh aligned with water quality parameters (temperature, pH, dissolved oxygen (DO) and total dissolved solids (TDS)) of the lake. A total of 600 specimens were collected from October 2018 to March 2019 using a cast net. Three different forms of length (Total length, TL; Standard length, SL; and Fork length, FL) sided with the body weights (BW) of the samples were measured to determine the length-length and length-weight relationship. Temperature, DO, pH, and TDS were recorded to be 24.8 - 25.7°C (25.27±0.38), 6.9- 7.8 (7.37±0.05), 6.1 -6.7 mg/l (6.4±0.3) and 60-110 ppm (79±2.0), respectively. The mean TL, SL, FL and BW were 8.588 ± 0.780 cm, 6.830 ± 0.644 cm, 7.390 ± 0.708 cm and 5.712 ±1.636 g, respectively. The month-wise values of correlation coefficient (r) of the relationships between TL vs SL, TL vs SL, and SL vs FL were determined as 0.96 to 0.98, 0.91 to 0.98 and 0.91 to 0.96. The ‘r2’ values of the TL vs BW, SL vs BW and FL vs BW vacillated 0.91 - 0.94, 0.92 - 0.94 and 0.90 - 0.92, respectively. The values of the ‘r2’ reflected that every relationship had a high degree of positive correlation. Furthermore, the length-weight relationships of the fish had regression coefficients ranging from 2.50 to 2.93, suggesting a negative allometric growth trend. The condition factor (K) ranged from 0.97 to 1.25, suggesting that the lake organisms were in good health. The findings of this study might be used as basic biological information to manage a sustainable production of this vulnerable G. chapra.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
983
999
https://ejabf.journals.ekb.eg/article_208199_b4795a67fadb3c0f7b6f5a128a170f7a.pdf
dx.doi.org/10.21608/ejabf.2021.208199
Evaluation of Insulin-like growth factor-1 (IGF-1), antioxidant enzymes, and heavy metals in Oreochromis niloticus collected from different stations along the River Nile
Soha
M. Hamdy et al.
author
text
article
2021
eng
This study was carried out to assess the insulin-like growth factor-1 (IGF-1), levels of some physicochemical parameters and heavy metals in water collected from the River Nile. The results showed that the physicochemical concentrations of the water samples were as follows: temperature 16.3-36.5°C, transparency 54.3-80.2 cm, electrical conductivity 268-320 μS/cm, pH 7.5-8.3, dissolved oxygen 7.3-11.2 mg/l, biochemical oxygen demand 1.3-3.3 mg/l, chemical oxygen demand 6.3-10.7 mg/l, and ionized ammonia 0.57-0.96 mg/l. Heavy metals (Fe, Mn, Cu, Zn, and Pb) in water showed maximum values as follows: (5.8, 0.51, 0.350, 0.230 and 0.90 mg/l) and (5.2, 0.42, 0.13, 0.47, and 0.27 mg/l) in summer and winter, respectively. The levels of metals detected in the tilapia muscle were higher than those found in water. Increased activity of aspartate aminotransferase (AST) and alanine aminotransferase (ALT) was detected in the blood analysis of O. niloticus. Levels of urea, uric acid, glucose, cholesterol and insulin-like growth factor-1 (IGF-1) were high in fish collected from polluted sites (iron and steel factory at Helwan, sugar cane factory at El-Hawamdia, Road El-Farag, and Electricity station at Shobra El-khima). In addition, a significant increase (P<0.05) was shown in the activities of catalase (CAT), superoxide dismutase (SOD), and level of malondialdehyde (MDA) when compared to reference station (V) EL-Qanater. The results indicate that Nile tilapia resisted oxidative stress induced by heavy metal exposure by antioxidant mechanisms.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
1001
1016
https://ejabf.journals.ekb.eg/article_208200_cc17dd8339b51a50ce8f5459e451c218.pdf
dx.doi.org/10.21608/ejabf.2021.208200
Salvatoria aegyptia n. sp. (Annelida, Syllidae) from El Ataka wharf, Suez Gulf (Egypt)
Faiza
Ali Abd Elnaby
author
Guillermo San Martín
San Martín
author
text
article
2021
eng
A new species of the genus Salvatoria McIntosh, 1885 (Annelida, Syllidae) was detected during a fouling collection on the hard substrates of the Wharf of El Akaba in the Suez Gulf. On the 5th of Jan, 2021, a holotype and 8 paratypes were collected using a metal frame with an attached cone net. Samples were subjected to examinations under a stereomicroscope and identified to species level under an Olympus microscope. Scanning electron micrographs were taken and examined. Descriptions of the new species were determined. Results showed that this species has spindle-shaped dorsal cirri and antennae, pointed, oval pharyngeal tooth located on the anterior margin of the pharynx, and compound chaetae with elongated, bidentate blades, with teeth well separated from each other, and fine spines on the margin. The most similar species to the Egyptian species is Salvatoria nitiduloides, Nascimento et al., 2021 from Brazil. However, the Egyptian species has the pharyngeal tooth more anteriorly located, and the dorso-ventral gradation in the length of blades is less marked than in the Brazilian species, especially on posterior segments. The holotype and a paratype of the new species were deposited in the collection of (TBAB 853) Lab. Of Oceanography & Fisheries, Alexandria branch, Egypt. It was recorded as Salvatoria aegyptia n. sp, with reference to Egypt where it was found. This research would enrich the aquatic literature by adding useful data and recording a newly identified species to benefit scientists and researchers interested in this field.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
1017
1032
https://ejabf.journals.ekb.eg/article_209127_58479aa717ca15608b1bd1de0cb76b86.pdf
dx.doi.org/10.21608/ejabf.2021.209127
Effect of the biotic and abiotic factors on the abundant species of macrobenthic invertebrates in northern Khors of Lake Nasser
Isaac
A. Iskaros et al.
author
text
article
2021
eng
Major macrobenthic invertebrates’ groups along with the surrounding environmental conditions of four important khors located in the northern sector of Lake Nasser were seasonally analyzed during 2015. For better understanding the community structure and the diversity of the main functional groups of organisms, the following parameters were considered: temperature, transparency, electrical conductivity, hydrogen ion concentration, dissolved oxygen, nitrite, nitrate, orthophosphate and chlorophyll-a. Besides, the type of sediments and their contents (organic matter and calcium carbonate) and heavy metals (iron, manganese, zinc, and copper) were also determined. A number of 27 taxa, belonging to 16 families of macrobenthic invertebrates, were encountered in the northern khors of Lake Nasser. Specimens contained 10 chironomid larvae, 3 odonate nymphs, 5 annelids, 5 mollusks, 1 decapod, and 1 adult corixid. In addition, 2 unknown species belonging to ephemeropteran nymphs and trichopteran larvae were identified. The combined contribution of aquatic insects, molluscs, and oligochaetes constituted the abundant groups of khors’ macrobenthic invertebrates throughout the study period. The highest density of macrobenthic invertebrates was recorded at the littoral sites of Khor El-Ramla (ann. aver. 3262 ind./m2 with 15.5 GFW/m2) and Khor Kalabsha (ann. Aver. 2983 ind./m2 with 19.8 GFW/m2) accompanied with some patches of submerged macrophytes. The declined density values were observed at Khor Rahma (ann. aver. 825 ind./m2 with 9.8 GFW/m2), where most of the aquatic plants disappeared. Shannon (H) diversities of those communities were measured. The results of the analysis variance on SPSS and Pearson correlation coefficient showed that water temperature, transparency, electrical conductivity, hydrogen ion concentration, dissolved oxygen, Chlorophyll-a, nitrite, nitrates orthophosphate, organic matter and calcium carbonate are the most influential parameters on different groups of macrobenthic invertebrates at varying degrees. The data obtained in this investigation would be crucial to understanding macrobenthic invertebrates’ regulation and would hence contribute to the knowledge regarding the limnology of Lake Nasser, particularly after the establishment of Renaissance Dam in Ethiopia.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
1033
1061
https://ejabf.journals.ekb.eg/article_209129_6b9e10f919ed1c53a2bf05e7ff37dbbb.pdf
dx.doi.org/10.21608/ejabf.2021.209129
Fish Skin Mucus as Putative Bio-resource for the Development of Next-Generation Antibiotics
Anita
Bhatnagar
author
Pragati
Rathi
author
text
article
2021
eng
To resolve the ubiquitous crisis of antibiotic resistance rose due to overuse/misuse of certain drugs and antibiotics against which pathogenic bacteria have developed resistance; there is a need to replace these antibiotics with next-generation antibiotics and Zoo therapy is one of the important measures to attain this goal. In the context of reducing antibiotic resistance, fish epidermal mucus has been proven to be a boon to overcome this alarming issue. It holds valuable antimicrobial components in the form of antimicrobial peptides, glycoproteins, and antimicrobial bacteria which assist fishes to guard themselves against pathogens in the aquatic ecosystem. This study emphasizes the composition and role of fish skin mucus in disease resistance and describes the significance of antipathogenic bacteria isolated from skin mucus in protecting fish from various infections thus suggesting the means to replace antibiotics with next-generation drugs obtained from fish skin mucus taking a step towards sustainability of the ecosystem.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
25
v.
5
no.
2021
1063
1091
https://ejabf.journals.ekb.eg/article_209279_17fff1b8946c1d3188ecf3db5d4eea3e.pdf
dx.doi.org/10.21608/ejabf.2021.209279