2024-03-28T22:22:18Z
https://ejabf.journals.ekb.eg/?_action=export&rf=summon&issue=16517
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Some aspects of the biology of West African Ilisha (Ilisha africana, Bloch 1795) from the coast of Ghana, West Africa
Berchie
Asiedu
Samuel
K. K. Amponsah
Nii
A. Commey
Some aspects of the reproductive biology of West Africa Ilisha, I. africana in the coastal waters of Ghana, were studied between August 2018 and July 2019 to enhance sustainable management and exploitation. The mean length varied significantly with sex (12.8 ± 0.2 cm in males, 13.9 ± 0.3 cm in females). Condition factor (K) varied significantly with sex (0.70 ± 0.01 in males, 0.73 ± 0.02 in females). The growth pattern for males and females was 2.93 and 3.02, respectively. The sex ratio of 1.3 male: 1.0 female was observed which deviated significantly from the theoretical 1 male: 1 female ratio, indicating that males were significantly more than females (X2 =14.0, df = 6; P = 0.029). The GSI varied significantly with sex throughout the study (2.29 ± 0.30 in males), (3.94 ± 0.25 in females). Five maturity stages were recorded for both males and females. The spawning period for males was August – December whereas in females, the spawning period was August – January. The length at first maturity for females and males was 16.0 cm and 15.9 cm, respectively. Fisheries management strategies such as closed fishing season should take into account the major spawning season to ensure the full realization of its objective which is to preserve the fish stocks in Ghana’s waters and exploitation within biologically acceptable levels.
West Africa Ilisha
sex ratio
gonadosomatic index
Condition factor
Length at first maturity
Spawning period
2020
08
27
1
14
https://ejabf.journals.ekb.eg/article_109691_28fa5dccc8700650d8c29c0efbbc5464.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Effect of location and grilling process on heavy metals concentration in muscles of different fish species, Egypt
Sayed
M. Ibrahim
Shaban
A. El-Sherif
Safwat
Abdel-Ghafour
Abdel-Rahman
S. Abouzied
Hassan
M. Rabea
Adel
A. El-Lahamy
Haitham
M. El-Sayed
Kamel
S. Abo–Zeid
This study aims to investigate the heavy metals concentrations in muscles of three raw fish species; mullet (Mugil cephalus), Nile tilapia (Oreochromis niloticus) and catfish (Clarias gariepinus) obtained from four different locations; the Nile River and Lakes of Wadi El-Rayan, Edku and Burullus during July 2019, and to study the effect of common grilling technique on their concentration in Nile tilapia samples as abundant fish. 17 elements were determined in fish muscles by ICP-OES Agilent 5100 VDV. Results revealed that the concentrations of heavy metals in fish species based on location were taken the following order; Burullus ˃ Nile River ˃ Wadi El-Rayan ˃ Edku. Whereas they were tilapia ˃ catfish ˃ mullet of Nile River, mullet ˃ tilapia ˃ catfish of Wadi El-Rayan, catfish ˃ tilapia ˃ mullet of Edku and catfish ˃ tilapia ˃ mullet fish of Burullus. The grilling process reduced the heaviest metals concentrations in tilapia species compared to raw samples. In conclusion, the heaviest metals in the muscles of fish species were lower than the maximum permissible limits set by International and Egyptian Standard Specifications and Legislations of food. Also, the grilling technique is an appropriate method to reduce the harmful effect of some heavy metals.
Heavy metals
Nile River
lakes
Lagoons
fish
grilling
2020
08
24
15
24
https://ejabf.journals.ekb.eg/article_109083_1dda55227f5ffcc078b5bfe3c9560654.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Temperature effects on the opercular respiratory rates of Clarias anguillaris fingerlings reared under Laboratory conditions in Minna, Nigeria
Adesola
Ayanwale
Omolola
Oloruntoba
Unique
Keke
Patrick
Samuel
Effects of different temperature levels on the opercular respiratory rate of Clarias anguillaris fingerlings were investigated for a period of 6 weeks under laboratory conditions. Fifty fingerlings were raised in water temperatures of control (26.66±0.28), 30.00, 32.00, 34.00 0C with 2 replicates each respectively. Opercular Respiratory Rates (ORR), body weight, and physicochemical parameters were determined weekly based on standard methods. ORR was significantly (p < 0.05) reduced from 113.60 ± 7.67 to 105.50 ±10.23 opercular beats per minute from week 1 to 2 in the control temperature. ORR was also significantly (p < 0.05) higher from 30 to 34 0C from week 1 to 2. A strong negative correlation was observed between body weight and ORR from all the treatments. Electrical conductivity (519.92±5.06 to 586.33±17.50 µS/cm) and Ammonia concentration (1.11±0.10 to 1.98±0.06 mg/L) were (p < 0.05) higher from the control temperature to 30.00 0C. ORR of C. anguillaris fingerlings increased with an increase in temperature, while ORR decreased with an increase in fish size and duration of the experiment. The temperature had no effects on dissolved oxygen, biochemical oxygen demand and pH except bodyweight in weeks 1, 3 and 5. Ammonia concentration and electrical conductivity increased with an increase in temperature. The findings from this study revealed that higher temperature levels affect the opercular respiratory rates, ammonia concentration, and electrical conductivity of Clarias anguillaris fingerlings in captivity.
Clarias anguillaris
Opercular respiratory rate
Bodyweight
temperature levels
fish size
2020
08
27
47
58
https://ejabf.journals.ekb.eg/article_109682_c9241ccb3441de6626716e87b02f06b6.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Influence of algal architecture and shore exposure on population dynamics of marine amphipods at Ras Mohamed Protectorate, Egypt.
Mostafa
Kh. Gabr
Amr
F. Zeina
Ahmed
M. Hellal
Amphipods are one of the major invertebrate groups and spreading among marine macro-algae in the intertidal zone at Ras Mohamed Protectorate. But, very scarce information is available about amphipod species presence, their abundance and the factors affecting their distribution. So the present work aimed to study the effect of some physical factors on the abundance and diversity of amphipod species inhabited macro-algal hosts. Through the present work, samples were collected seasonally from three sites inside this protectorate.
Results indicated that 2 macro-algal species of red algae were collected from these three sites. The algal species fluctuated in different sites. 16 of the amphipod species were recorded inhabiting them. The highest abundance and diversity of amphipod species were recorded at Yollanda beach. Some amphipod species were found at the site and not recorded at other sites. The diversity and abundance of these amphipod species were fluctuated between sites depending on many physical factors such as wave exposure, the shape of algal hosts, surrounding habitats and environments
Macroalgae
Ras-Mohamed
Algal architecture
Wave action
2020
08
28
59
72
https://ejabf.journals.ekb.eg/article_109900_e102ac5a15058f38595a90ece8a6d1c7.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Monograph of the Egyptian Octopuses Order: Octopoda (Cephalopoda: Mollusca). Part III
Rafik
Riad
The cephalopods are known to be commercially and ecologically important around the world. Class Cephalopoda is made up of four major groups, Cuttlefishes, Squids, Octopuses, and Nautilii. The first three groups are present in Egypt in the Mediterranean Sea and in the Red Sea and constitute a main component in the fisheries industry in Egypt. In order to understand the biology and ecology of any species, their identification should be conducted properly to maximize the accuracy of any study. The present monograph is prepared to demonstrate an identification key for the octopus species of the order Octopoda in the Egyptian waters. This is the third publication demonstrating a first-in-kind identification key for the three major cephalopod groups. The first monograph was about the cuttlefishes and the second was about the squids.
Six Egyptian Octopus species (Order: Octopoda (Cephalopoda: Mollusca) were recorded; Octopus vulgaris, Octopus macropus, Eledon moschata, Octopus defilippi, Octopus aegina and Octopus membranaceus. Three of them Octopus vulgaris, Octopus macropus and Eledon moschata were recorded in Alexandria in the Mediterranean Sea, while Octopus aegina and Octopus membranaceus were recorded in The Gulf of Suezin TheRed sea. Finally, three species; Octopus vulgaris, Octopus macropus and Octopus defilippi were recorded in both seas. The identification was conducted by means of morphological features and for this purpose, key structures of individuals from each species were dissected and drawn by means of a zoom stereoscopic microscope provided with a Camera Lucida drawing tube. The specimen structures were also photographed by a Canon Digital Camera.
Monograph
Octopuses
Egypt
Mediterranean Sea
Red Sea
Mollusca
2020
08
28
73
102
https://ejabf.journals.ekb.eg/article_109885_0856619e411e8dd9afd3e2daa6b85679.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
How Culture Medium pH Range Influence Phytoplankton Growth Performance and Biochemical Content
Shymaa
S. Zaher
Amr
M. Helal
The challenge today is to incorporate phytoplankton as a source of protein for food and feed to higher organisms in the food chain. The growth response and total biochemical content of three pure phytoplankton cultures to different ranges of pH in the synthetic medium were explored under controlled laboratory conditions. The tested species were Chlorella vulgaris Beyerinck [Beijerinck], Nannochloropsis oculata (Droop) D.J.Hibberdand Scenedesmus quadricauda (Turpin) Brébisson. Growth response was determined from acidic to alkaline conditions by chlorophyll values, total biochemical content, proteins, carbohydrates and lipids. The results indicated that the tested species showed different growth patterns and total biochemical content under the same incubation conditions. Generally, the highest biochemical content was total protein followed by carbohydrates and lipids. At pH (11) of the medium the highest protein peak of Chlorella vulgaris was (68.1mgl-1) and Nannochloropsis oculata was (94.6mgl-1). The maximum protein content of Scenedesmus quadricauda (86.7mgl-1) recorded at pH (9) of the medium. The best pH values for growth of tested species were pH (7) for Chlorella vulgaris and pH (9) for Nannochloropsis oculata and Scenedesmus quadricauda. A major spot on the highly positive correlation between Nannochloropsis oculata optimum growth and its protein contents (r= 0.87) which indicate that pH (9) of the medium may be the best one in Nannochloropsis oculata large mass production. The highest carbohydrates and lipids content were detected at acidic conditions of the medium. This study assesses the best pH conditions needed for optimum growth of particular species to further applying in commercial mass production to get maximum protein yield.
microalgae
phytoplankton
Growth performance
Biochemical Constituents
pH shift
Chlorophyll a
2020
09
05
103
116
https://ejabf.journals.ekb.eg/article_111001_3fb8f24c344baac4d1e0cab61f4dbd46.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Reproductive biology of Siganus rivulatus (Forsskal, 1775) in the Red Sea, Suez Canal and the Mediterranean Sea, Egypt
Elham
M. Abdelhak
Fedekar
F. Madkour
Azza
A. El Ganainy
Mohamed
A. Abu El-Regal
Mohamed
I. Ahmed
Siganus rivulatus, is one of the most economically successful Lessepsian migrant fish, but its reproductive strategy in Egypt needs more studies. A total of 1178 individuals from the Egyptian coasts (the Red Sea; 334, Suez Canal; 353, Mediterranean Sea; 491) were collected seasonally during autumn 2017-summer 2018 to study the important aspects of its reproductive biology. The total length recorded in the Red Sea population (14-28 cm) showed higher values than that in the Suez Canal and Mediterranean Sea (8-22 cm). The sex ratio (M:F) did not significantly vary with the expected ratio (1:1) during all seasons at all sites (chi-square, P˃0.05). Seasonal changes in maturity stages of gonads and values of gonadosomatic index showed that the reproduction of S. rivulatus take place during spring, and extended to summer only in the Red Sea. No significant differences in ova diameter were recorded among sites (ANOVA, P˃0.05). The means of absolute fecundity (Fabs) were 409330, 127497 and 95204 eggs in the Red Sea, Suez Canal, and the Mediterranean Sea, respectively. Relative fecundity (Frel) was estimated as the number of eggs in ripe ovaries per unit of fish length and unit of fish weight. The Fabs and Frel of S. rivulatus increased with increasing in fish length (L) and weight (W). Results of Fabs and Frel displayed significant differences between sites (ANOVA, P<0.05), with higher values in the Red Sea than in the Suez Canal and the Mediterranean Sea.
Lessepsian migration
Siganus rivulatus
sex ratio
gonadosomatic index
Maturity stages
fecundity
2020
09
04
117
134
https://ejabf.journals.ekb.eg/article_110701_65533705c1d7b3dc11d05d18b78c5949.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Differentiation of endangered butter catfish, Ompok bimaculatus populations along the selected habitats of South-western Bangladesh: Evidence from morphological characters
Md. Sarower-
E-Mahfuj
Md. Abdus
Samad
Fee
Faysal Ahmed
Kazi
Shahrukh Elahi
Md. Ataur
Rahman
Ripon
Kumar Adhikary
Md. Yeamin
Hossain
The intraspecific morphological variations of the butter catfish, Ompok bimaculatus has been assessed from two fish farms viz., Chanchra Fish Farm, Jashore (CFFJ) and Fish Seed Complex, Khulna (FSCK) and two natural wetlands viz., Bohni beel, Gopalganj (BBG); Dakatia beel, Khulna (DBK) in the south-western part of Bangladesh. A total number of 80 samples were collected comprising 20 individuals from each sampling location. Five meristic characters, 18 morphometric characters and 21 truss-based morphometric characters were measured respectively. Meristic, morphometric and truss-based morphometric characters were exposed to one-way analysis of variance followed by Tukey-HSD post-hoc test at 5% significance level. Significant differences were observed in two meristic characters viz., CFR and PevFR, and five morphometric and four truss morphometric characters. However, morphometric and truss measurements showed highly intermingled among four populations in discriminant functions (DFs) analysis and discriminant space as well. DFs showed that 6-7, PrDL, HL, PSDL, 1-2, 4-6, FL, ED, 3-9, 5-6, SnL and 4-5 characters contributed 62.8% in first DF, while 2-9, HD, 1-9, 2-3, 2-6, 3-6, 3-4, LAB, 3-8, 9-10, IO and MXBLR characters contributed 20.6% in second DF, and the remaining characters contributed 16.6% in third DF. In cluster analysis, two distinct clusters were made, where BBG demonstrated a solitary group, and FSCK and CFFJ jointly shaped alternative clusters, while the DBK population found a subgroup with CFFJ. These results postulate the occurrence of intermingling populations of this species from four aquatic habitats. These morphological discrepancies play an important role in establishing proper decisions in order to achieve appropriate management and conservation as well as mass seed production for their future sustainability.
meristic
morphometric
endangered
Ompok bimaculatus
Bangladesh
2020
10
01
135
151
https://ejabf.journals.ekb.eg/article_120189_38848c275247392012fd1b1bc3c5fccb.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Chemical Composition, Nutritional Value, Safety, and Acceptability of Egyptian Red Sea Coast Fresh and Dried Spider Conch (Lambis Lambis) Meats
Hesham
F. Amin
Nesma
E. Hamza
Moharram,
Y.G.
The present study investigated the chemical composition, nutritional value, safety, and acceptability of fresh and dried spider conch (L. lambis) meats collected from the Red Sea Coast, Egypt. The results indicated that both fresh and dried conch samples are considered good protein sources with up to 55% on dry wt. basis. The protein contained both essential and non-essential amino acids especially glutamic acid, aspartic acid, arginine, leucine, and lysine, and had an acceptable calculated protein efficiency ratio (C-PER) (1.7 – 2.05) and computed biological value (C-BV) (77.24 – 77.42). The concentrations of Na (20898.33 and 14234 mg/kg), K (10098.33 and 6530.67 mg/kg), Ca (6000 and 6200 mg/kg) and P (4005 and 3600 mg/kg), in both types of fresh and dry conch meat, covered their daily level intakes of man. In contrast, both types of meat are considered free from Co (<0.001mg /kg) and the dry samples had Pb (0.94 mg /kg) which is less than its maximum permissible limits (2 mg /kg; FAO/ WHO, 1989). Oil of fresh and dried conch meats (3.85% and 3.77% on dry wt. basis, respectively), were rich in unsaturated fatty acids (USFAs) particularly omega-3 ones, and with a ω6: ω3 ratio of 2.08:1 and 1.46:1, respectively. Both types of conch meats were nearly free from Staphylococcus aureus and Vibrio spp < /em>, with a total aerobic bacteria count (APC) less than 106 and 105, respectively, the ICMSF (2002) upper acceptable limits for fish and dry fish in addition to low molds and yeasts count. The sensory panelists rated the overall acceptability of the dried conch meat to be fair to good.
Spider conch
Chemical composition
Nutritional Value
safety
acceptability
2020
09
06
153
165
https://ejabf.journals.ekb.eg/article_111062_1a38131aed0febe5b8ddb4e33ddd2a73.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Chemical fractions and ecological risk of metals in sediments of the Bitter Lakes, Egypt.
Naglaa
F. Soliman
Eman
M. Elkady
Alaa
M. Younis
Total levels and fractions of metals (Cd, Cr, Fe, Mn, Ni and Pb) in sediments of the Bitter Lakes were attained and several indices and guidelines were used to evaluate pollution and potential risk. Metal contents revealed a clear spatial distribution in the sediments mainly for Cr, Mn, and Ni which may be caused by human inputs of metals, and predominant physicochemical conditions and complex reactions proceeding in the sediments. Sequential extractions showed that all metals were mostly composed of residual and Fe/Mn-oxide bound fractions.
All potential risk indices depended on the bioavailable fractions contents such as risk assessment code (RAC), individual contamination factor (ICF), and modified potential ecological risk factor ( 15Eri"> -A) proposed that Cd had the lowermost ecological concern, demonstrating slight reactivity in the lake ecosystem, and consequently presented a low risk. Whereas risk assessment indices dependent on the total metal contents represented by threshold and probable effect level (TEL-PEL approach) and potential ecological risk factor ( 15Eri"> ) designated that most Cd was in a highly individual potential ecological risk. Numerous indices that estimated from the measurements of total and chemical fractions concentrations should be conducted to make the risk assessment procedures precise and consistent in the investigation of deposited metals.
Metals
Lake sediment
sequential extraction
mobility
Ecological risk
Bitter Lakes
2020
09
05
167
196
https://ejabf.journals.ekb.eg/article_110915_c9841785061f948ad081df5edf04f2c0.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
The influence of certain ecological parameters on a potable water treatment plant in El-Dakahleyia Province.
Mansour
Galal
Gamalat
Osman
Khalid
Giba
Mona
Maamoun
This study was carried out on El-Sharqe Water Treatment Plant in El-Mansoura city to follow up various types of zooplankton, certain physicochemical parameters and their possible role in the efficiency of the water treatment process. The relative percentage of Protozoa to the total zooplankton ranged from 93.3 to 86.5% and from 94.6 to 84.9% in the Nile and El-Mansouria influents; respectively while those of rotifers, worms and insect larvae were fewer and more or less similar to each other. The highest and lowest numerical densities of all these groups were recorded mostly on September 2018 and on Jannuary2018 respectively.
Regarding the physicochemical parameters of influent and effluent water samples, it appears that electrical conductivity, total dissolved solids, dissolved oxygen, and nitrates are higher in the effluent samples as compared with those of the influent ones, turbidity, alkalinity, consumed oxygen, ammonia and nitrites follow an antagonistic behaviour. It was obvious that consumed oxygen, iron, ammonia and nitrite concentrations achieved zero levels in the effluent samples which might give a good indication for the efficient performance of this water treatment plant. It is necessary to mention that nitrates followed a particular behaviour where its concentrations achieved higher levels in the effluent as compared with the influent due to the higher aerial oxidation rate in the latter samples.
Statistically, zooplankton particularly Protozoa proved higher positive correlations with temperature, PH, electrical conductivity, turbidity, nitrites and nitrates where their correlation coefficients (r) ranged mostly between 0.8 and 0.92. On the other hand, the application of the multiple regression proved highly significant relationships between certain zooplankton organisms versus some of the physicochemical parameters (0.002 < P < 0.001).
Physico
chemical parameters Protozoa Water treatment Zooplankton
2020
09
06
197
205
https://ejabf.journals.ekb.eg/article_111272_7cc3c93af0cd45b20b6323473145188c.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
A new recorded of red tide forming species; Heterocapsa triquetra, Gymnodinium impudicum, Heterosigma akashiwo and Thalassiosira rotula in Alexandria Waters, Egypt
Samia
Mikhail
Nehma
Khalil
Mona
El-Hadary
The current study is based on daily monitoring observations to follow phytoplankton blooms in the Eastern Harbor (Alexandria) within a year cycle. The harbor ecosystem was harsh and characterized by various dynamics and variable conditions of a multitude of environmental factors that ultimately were considered strong stressors on phytoplankton development. Three red tide blooms reach extremely high biomass leading to water discoloration triggered in late summer-early autumn, and during the last week of December as well. These blooms were considered unique as represented by newly reported red tide causative species of different groups never previously reported in the Egyptian Mediterranean waters as a red tide bloom species; Heterocapsa triquetra and Gymnodinium impudicum (Dinophyceae), Heterosigma akashiwo (Raphidophycea) and the centric diatom Thalassiosira rotula, and under influence of characterized environmental conditions. The highest bloom peak of H. triquetra occurred on 9 August (12.97x 106 cells L-1), H. akashiwo on 26 August (13.91x106 cells L-1), G. impudicum on 16 September (7.12x106 cells L-1) and T. rotula on 28 December (3.25 x 106 cells L-1). The blooms of the first three species maintained much higher temperature (30.4 - 32.9 ⁰C) and lower salinity (28.6 - 29.3) compared with the winter bloom in December, while nutrient concentrations exhibit considerable variations and the N/P ratio falls down to a minimum with the bloom peak days. The significant contribution of physical forcing rather than chemical on bloom developments was statistically confirmed but failed to define specific controlling factor/s. The winter bloom of Thalassiosira rotula was a surprising and unique first winter red tide bloom in the Eastern Harbor, under minimum annual temperature (18.8°C - 19.6 °C), stresses the strong effect of NO3, NO2 and OOM on the bloom development. These blooms maintained higher OOM relative to inorganic nutrients. No fish mortality occurred. The present work offers persuasive evidence for the increased number of newly recorded red tide bloom-forming species in Alexandria waters.
Red Tide
Heterocapsa triquetra
Gymnodinium impudicum
Heterosigma akashiwo
Thalassiosira rotula
Eastern Harbor
2020
09
06
207
223
https://ejabf.journals.ekb.eg/article_117258_b3566cc36b1d10b4a2b313d4d562dae2.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Effect of different doses of human chorionic gonadotropin (HCG) hormone on stripping response and reproductive performance of the African catfish (Clarias gariepinus).
Sayed
R. S. Zidan
Hamed
H. E. Saleh
Ahmed
I. Semaida
Ramadan
M. Abou-Zied
Sobhy
M. Allam
This study was conducted to investigate the effect of different doses injection of human chorionic gonadotropin (HCG) hormone on stripping response and reproductive performance of African catfish (Clarias gariepinus). African catfish spawners were intramuscularly injected with different doses of HCG (500, 1500, 3000, 6000 IU/kg female); males were injected at half the female dose. The results showed that fish group injected by 6000 IU/ kg female had the highest ovaries weight and gonadsomatic index, but, recorded the lowest value from ovulated egg diameter. The lower latency period was recorded with 6000 IU/ kg female (12 h). While, the highest latency period were in 500, 1500 IU/ kg (28 h) and 3000 IU/ kg (22 h). The number of fertilized eggs/ female and fertilization rate (%) were significantly different (P£0.05) among the experimental treatments, with the highest number of fertilized eggs/ female and fertilization rate were observed with 6000 IU/ kg female (60848 fertilized eggs/ female with 84.45%) and the lowest number of fertilized eggs/ female and fertilization rate were presented with 500 IU/ kg female (3372 fertilized eggs/ female with 10.15%). The number of larvae/ female and hatching rate showed significant differences (P£0.05) among different level of HCG hormone with the highest number of larvae and hatching rate with 6000 IU/ kg female (49657 larvae/ female with 81.45%) followed by those 3000 IU/ kg female (43177 larvae/ female with 73.65%), 1500 IU/ kg female (12099 larvae/ female with 57.9 %), while the incubation eggs of group injected with 500 IU/ kg female don’t show any hatching larvae. It was observed, HCG hormone has successfully and accelerate induced spawning in African catfish (Clarias gariepinus)and increased in reproductive performance with the increase in HCG dosage.
African catfish
HCG hormone
gonadsomatic index
latency period
Fertilization rate
hatching rate
2020
09
09
225
242
https://ejabf.journals.ekb.eg/article_111531_fda726ea4983c069ccf664e0d5aea055.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Diversity of freshwater fish in the lower reach of Indus River, Sindh province section, Pakistan
Naveed
A. Abro
Baradi
Waryani
Naeem
T. Narejo
Sara
Ferrando
Saeed
A. Abro
Abdul
R. Abbasi
Punhal
K. Lashari
Muhammad
Y. Laghari
Ghulam
Q. Jamali
Gul
Naz
Muneer
Hussain
Habib
-Ul -Hassan
According to reports, the last comprehensive fish records from the Indus River were published in 1977. Although few recent studies have been conducted, they are limited to some confined localities, and hence there was a gap of comprehensive fish diversity analysis of the Indus River in the Sindh province section. Therefore, the present investigation was performed to describe the fish fauna of the Indus River from its northern to its southern extremities. In order to establish fish diversity and distribution, the study was accomplished from June 2016 to May 2017 covering 8 sampling locations across the river. A total of 44 fish species, belonging to 35 genera, included in 18 families, and 9 orders were recorded. Family Cyprinidae was the most specious with 13 species followed by Bagridae and Cichlidae with 4 species each, and Siluridae with3 species. Alpha Diversity Indices study showed that the ichthyofauna diversity of the River was not high in comparison with previous studies. Shannon’s index for the whole Indus River locations was 0.95 and the evenness index was 0.77. Sustained populations of exotic fish species were shown to have established in the Indus River.
Indus River
Fish biodiversity
Shannon’s index
Jaccard’sdichotomy coefficient
Similarity Index
2020
09
06
243
265
https://ejabf.journals.ekb.eg/article_111114_cf6ce60b62a2f254a3113d832f8671ab.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Effect of replacing fish meal in the fish diet by zooplankton meal on growth performance of Dicentrarchus labrax (Linnaeus, 1758)
Salama
E. Hassan
Ahmad
M. Azab
Hamdy
A. Abo-Taleb
Mohamed
M. El-Feky
This study aimed to evaluate the effect of replacing fish meal in the fish diet by zooplankton meal on the growth performance of European sea bass, Dicentrarchus labrax. A total of 900 fingerlings of the D. labrax were collected from fish hatchery Kilo 21, Alexandria and transported to the fish rearing unit in El-Max Research Station, National Institute of Oceanography and Fishers (NIOF), Alexandria, Egypt. After two weeks for acclimation, the fish were divided into 5 groups, 3 replicates for each group (60 fish in one cubic meter of Haba for each replicate). The five experimental diets were: G1: commercial diet (control group); G2, G3, G4, and G5 fish meal in this commercial diet was replaced by zooplankton meal as 25%, 50%, 75% and 100%, respectively.
The highest values of growth performance parameters and PER & FER of D. labrax were recorded in G5, while the lowest values were recorded in the control group. The best average of FCR (1.75±0.02) was recorded for G5 and its bad average (2.18±0.18) was recorded in G1. The present study concluded that zooplankton positively affected growth performance parameters and enhanced feed utilization of sea bass.
European Sea bass
Dicentrarchus labrax, Fish meal
fish diet
Zooplankton
Growth performance
feed utilization
Food conversion ratio
2020
09
11
267
280
https://ejabf.journals.ekb.eg/article_111756_823e0e973f6d0798e1d8ba8b8972bbf2.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Analysis of morphometric and meristic characteristics of Pomadasys stridens (Forsskål, 1775), Family: Haemulidae from the Gulf of Suez, Red Sea, Egypt.
Aya
A. A. Basuonie
Manal
M. Sabrah
Asaar
S. H. El-Sherbeny
Mohamed
S. A. El-Sabbagh
The morphological diagnosis, morphometric, and meristic characters for the striped piggy Pomadasys stridens in the Gulf of Suez were studied by the examination of 165 specimens collected during the fishing season 2017/2018. These fishes ranged from 8.2 to 16.3 cm in total length and 7.3 to 57.3 g in weight. Twenty morphometric and eleven meristic characters were investigated in detail. The analysis of morphometric characters revealed that the morphometric measurements of various body parts were dependent on body size and there is a gradual increase in morphometric measurements with an increase in body length. Regression analyses were performed between the independent variable “TL” and the dependent variables “FL, SL, HL, HD, , BD, PreDL, DFL, PrePL, PFL, PreVL, VFL, PreAL, AFL, CFL, CFH, CPL, CPD” as well as between the independent variable “HL” and the dependent variables “ED, PreOL”. The results showed that there was a positive linear relationship between various morphometric measurements and TL as well as HL with a medium to a high degree of correlation. On the other hand, the fish showed constant meristic characters, where there was no change in meristic counts with the increase in body length. The fin formula can be written as D XII+14; A III+8; P 15; V I+5; C 15 and the recorded number of LLS, GR, and V were 57, 22, and 24 respectively.
Haemulidae
Pomadasys stridens
Suez Gulf
Morphology
Morphometrics
meristics
2020
09
12
281
294
https://ejabf.journals.ekb.eg/article_112083_6fa7ac64c372ed12a3d7712b4be27f32.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Carapace ultrastructure of the spider crabs Schizophrys dahlak (Majidae) and Hyastenus hilgendorfi (Epialtidae) from the Suez Canal, Egypt
Marwa
M. Osman
Wafaa
S. Sallam
Fedekar
F. Madkour
The microstructures of the carapaces of the spider crabs Schizophrys dahlak and Hyastenus hilgendorfi were examined under both scanning and transmission electron microscopes. Image analyses of the cross-sectioned carapaces showed that both species have a hierarchical microstructure with three well-defined layers. The two innermost layers (exocuticle and endocuticle) consist of stacked fibers arranged in a twisted plywood fashion producing a "Bouligand structure". They have a similar structure but different thicknesses and height of the stacks. The cuticles are inter-stitched with pore canals of varying width between the studied species, running transversely to the layered structure. This variation in the width of the pore canals in the two species seems to be proportional to the size of the carapace and its surface area.
Spider crabs
Schizophrys
Hyastenus
Microstructure
TEM
2020
09
12
295
305
https://ejabf.journals.ekb.eg/article_111559_046beb7e66ba8d9238bba56e1fe898b1.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Potentially pathogenic free-living amoebae in fresh and sea waters from Alexandria, Egypt
Amgad
Salahuldeen
Ahmed
Abd El-Aziz
Mahmoud
A. Gad
Mouhamed
F. Abou-El Nour
Ahmad
Z. Al-Herrawy
A total of 48 samples from two different water bodies;24 from fresh and 24 from marine waters (Alexandria) were collected, filtered, cultured on non-nutrient agar, and incubated at 37ºC for the presence of potentially pathogenic FLAs. Amoebae were isolated and identified by means of their morphological characteristics of both trophic and cyst stages. After collection for one year, it was found that freshwater samples had a higher occurrence of FLAs (83.3%) than seawater samples (37.5%). The highest occurrence percentage of FLAs was 100% in freshwater and 83.3% in seawater samples in summer, while their lowest values reached 66.7% and 16.7% in autumn Respectively. Morphological identification of these isolated amoebae revealed the presence of FLAs belonging to 5 genera namely Acanthamoeba, Naegleria, Vahlkampfia, Vermamoeba as well as Vannella.
Potentially pathogenic free-living amoebae
Morphology
fresh water
Sea water
2020
09
30
307
318
https://ejabf.journals.ekb.eg/article_116792_33a82de49f5b03e177f5159868552f56.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Amelioration of anxiety and locomotion during circadian rhythm change of adult zebrafish (Danio rerio) by Pranic Energy
Abhishek
Nadig
Srikanth
Nagaraja Jois
Krishnamurthy
Nagendra Prasad
Vijayakumar
Vinu
Abnormal stress level, anxiety, and reduced locomotion are prominent symptoms after circadian rhythm is changed. This study investigates the influence of pranic energy on zebrafish behaviour during circadian rhythm changes. Adult zebrafish were kept in control and experimental aquariums. As an adjunct, the experimental fishes (Pranic group) received the Pranic Healing techniques for fish, food, and water to reinforce the energy in them. Individual fishes were exposed in an open area for 5 minutes and parameters including average speed, mobile speed, average acceleration, mobility rate, exploratory rate, total distance travelled, and total immobile were measured and analysed by Tox-Track tracking software. Stress was created to fishes by alternating circadian rhythm for 3 days for both groups. The changes in locomotion and anxiety data were analysed using One Way ANOVA and Mann-Whitney U test with SPSS software. Pranic treated zebrafishes (46) had increased average speed of 8.18 mm/s (p < .002), mobile speed of 7.56 mm/s (p < .000), average acceleration of 323.71 mm/s2 (p < .000), mobility rate of 11.36% (p < .009), total distance travelled of 29.490m (p < .000)and total immobile of 30.68s (p < .016) compared to control group (43). Pranic energy positively influenced the behaviour of adult zebrafish by increased locomotion and decreased anxiety levels during changed circadian rhythm
Prana
Daniorerio
Photoperiod
circadian rhythm
Locomotion
freezing
2020
09
11
319
329
https://ejabf.journals.ekb.eg/article_117478_5117e20cf488fe9fb549f251c687b38b.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Functional properties and proximate compositions of bony barb protein hydrolysated
Junianto
Junianto
Eddy
Afrianto
Zahidah
Hasan
Bonylip barb is a fish of Indonesian origin lower in economic value than introduced fishes like catfish and Nile tilapia. The fish’s added value may be improved by subjecting it to a process which is aimed to derive its protein hydrolysate. The purpose of this research was to determine the functional properties and proximate composition of bonylip barb protein hydrolysate flour. Bonylip barb protein hydrolysate flour was produced by, first, grinding of the bonylip fish, then by hydrolysis with 5% (w/w) papain at 55 oC at pH 7 for 6 hours, and by centrifugation at 5,000 rpm at 4 oC for 20 minutes, with the supernatant resulted being freeze-dried. The bonylip barb protein hydrolysate flour produced was observed for the functional properties, proximate composition, and amino acid profile. The research results show that the bonylip barb protein hydrolysate flour’s scores for the functional properties of water absorption, oil absorption, emulsifying capacity, bulk density, and solubility in water were 3.1 mL/g, 1.94 mL/g, 23.60 %, 0.83 g/ml, and 78.2 %, respectively. The bonylip barb protein hydrolysate flour contained water, protein, fat, and ash at 8.75 %, 84.65 %, 1.02 %, and 4.80 %, respectively.
Bonylip barb
Functional properties
Papain
Protein hydrolysate
proximate composition
2020
09
01
331
341
https://ejabf.journals.ekb.eg/article_112861_1593b8407f5d36ed185110457947c842.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Age, growth and maturity of the Indian Shad, Tenualosa ilisha through otolith examination from different habitats in Bangladesh
Md. Borhan
Uddin Ahmed
A. K. Shakur
Ahammad
Md.
Shahjahan
Md. Fazla
Rabbi
Mohammad
Ashraful Alam
Md. Nazmus
Sakib
Md. Abul
Bashar
Md. Ataur
Rahman
Md. Yeamin
Hossain
Yahia
Mahmud
Studies on the age, growth and maturity of Tenualosa ilisha are plagued by a lack of essential information; addressing this data gap is the aim of the present study. Six diverse habitats of hilsa across Bangladesh were chosen as sites for sample collection. For age determinations, lunar rings in the otolith of hilsa were used. The length and weight of each fish were recorded prior to otolith extraction. Extracted otoliths were polished to enable the visualization and quantification of rings. Except for the Kali River and Gaglajur Haor, age of the fish correlated strongly with both their length and weight (r > 0.95; p < /em> < 0.05). Again, except for those from the Kali River and Gaglajur Haor, all of the samples exhibited positive allometric growth patterns (b > 3) with the fish from the Tetulia River being the most positive (b = 3.48). The growth of T. ilisha in the Bangladesh was described as Lt = 48.02 [1-exp{-1.01(t-0.046)}] and growth performance was 3.04. The estimated Lm for T. ilisha was 26.04 (~ 26.00) (95% CL= 19.87-33.84) cm TL based on the maximum length-based model and it was confirmed by gonad histology. These results would be effective for the sustainable management of hilsa fishery in Bangladesh and neighboring countries.
2020
10
01
343
359
https://ejabf.journals.ekb.eg/article_119368_db9790434609d8e72f425f41b2a3a138.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Epidermal mucus as a potential biological matrix for fish health analysis
Heri
B. Santoso
Eko
Suhartono
Rizmi
Yunita
Danang
Biyatmoko
Epidermal mucus serves as a physiological and immunological first line of defense to maintain normal physiological status in Teleost fish. It offers protection against pathogenic infections and environmental contaminants. The ability of mucus as a protector depends on its bioactive components, such as high-molecular-weight glycoproteins, lysozyme, alkaline phosphatase, immunoglobulin, complement proteins, C-reactive proteins, lectins, agglutinin, interferon, vitellogenin, proteases, antimicrobial proteins, antimicrobials peptides, calmodulin, crinotoxins, pheromone, cytokines, acute-phase proteins, carbonic anhydrase, hemolysin, serotransferrin, heat shock proteins, superoxide dismutase, and pentraxins. Cortisol, glucose, lactic acids, reactive oxygen species, and cellular antioxidants were also detected in the epidermal mucus and have the potential as stress biomarkers. Aside from its potential as a biological matrix to assess the immunity and health status of fish, epidermal mucus also serves as an ecotoxicological biomonitoring tool by detecting biochemical biomarkers responses that arise. We encourage future studies to assess the potentials of the epidermal mucus biological activity using the proteomics approach, given the diversity of fish species. Knowledge about fish health and welfare is important for the conservation and preservation of species biodiversity
Fish skin mucus
Mucus bioactivities
Mucosal barrier
mucosal immunity
Mucosal biomarker
Non-invasive biomarker
Stress
2020
09
13
361
382
https://ejabf.journals.ekb.eg/article_114402_4d1f8c3f5c1c9fca7f1911e678ff7adb.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Biometric and histological studies of the shellfish Paphia undulata infested with parasites
Osama
Ward
Shereen
Fahmy
Rabab
Alkaradawe
Samya
Mohammad
The present study reported parasites and its histopathological effects on the tissue of the popular seafood clam Paphia undulata. Some parasites were found to have several effects on shellfish aquaculture production. Samples of clams were collected from Damietta shore, Egypt. Histopathological examination was conducted on the gills, gonads, and intestine of clams. Two types of parasites were detected in the infected clams (protozoans and nematodes). The identification of Protozoa was confirmed by using the electron microscope. This study revealed that 51% of P. undulata were infected with parasites. The highest infection was noticed in the clam size ranged from 2.1 to 4 cm. This infection declined with the larger clams. The current study proved that there was a negative association between the prevalence of parasites and clam size. Histopathological effects of parasites on the clam gills, gonads, and intestine were detected. Parasites not only affect clams but may also be transmitted to consumers after eating undercooked shellfish. So, this study warns against eating raw seafood as it is considered a vehicle for the transmission of human parasites.
Mediterranean Sea
clam
Paphia undulata
protozoan parasites
histopathology
2020
09
17
383
392
https://ejabf.journals.ekb.eg/article_113987_c28c904b7448d4f19285c65352b16fe7.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Status of Sepia officinalis and 19 Main Fisheries Species Caught from Southeast Mediterranean Sea, North Sinai, Egypt.
Ashraf
Y. El-Dakar
Salah
M. Aly
Attia
A. O. El-Aiatt
Ahmed
M. AL-Beak
The common cuttlefish (Sepia officinalis Linnaeus 1758) is consider one of the most important invertebrates (Class: Cephalopods) fishery resources that caught from the Eastern part of the Mediterranean Sea. In Egypt, S. officinalis has distinct importance from other fishes that come from natural resources, not only for its abundance in the total catch but for its marketable value as well. This study is the first investigation deal with the fishery status of common cuttlefish as a base on comparison with other main species, also to include catches analysis of 19 main species from the North Sinai fishery. North Sinai Fishery statistics for the period between 1997 and 2017 revealed that cuttlefish is the main cephalopod recourse exploited by the fleet in the southeast of the Mediterranean Sea. During the last few seasons, cuttlefish production is increased with the increase of its value, marketable demand, and high price, where it raised from 37 tons in 1997 to 60.7 tons in 2017. Purse seine gear landings represent almost 50 % of the total catch follows by trammel net and long line, however, trawl is not registered gear in North Sinai as it produced 30% of the total catch. It could be concluded from the current study that fisheries in North Sinai need integrated management for the important species to accomplish a maximum sustainable production.
Common cuttlefish
Fishery resources
North Sinai
Sepia officinalis
Mediterranean Sea
Gears
2020
09
17
393
404
https://ejabf.journals.ekb.eg/article_116577_5b62ce77818118ff3e250b0e243c5b75.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Efficacy of Dietary Nucleotides (Nucleoforce™)on growth, haemato-immunological response and disease resistance in Pangasianodon hypophthalmus fish (Sauvage, 1878) in Egypt
Mai
S. Yaseen
Mohamed
Abdelaziz
Dalia
A. Abdel-moneam
Elsayed
Abd-Elhay
Islam
M. Wassif
Mohamed
Moustafa
A feeding trial was performed to evaluate the efficacy of Dietary Nucleotides (Nucleoforce™) on Growth performance, haematological, biochemical, Immunological indices and disease resistance of Pangasianodon hypophthalmus fish to Pseudomonas aeruginosa. Dietary nucleotides were incorporated in the diet at different concentrations; group I control, group II 250 g/ ton diet and group III 500 g/ ton diet for 8 weeks. At the end of the feeding trial, weight gain, and specific growth rate (SGR) were recorded. Results showed that there was a significant increase in fish groups received diet supplemented with nucleotides in comparison with the control group. Haematogram indices showed a significant elevation in RBCs count, HB value, WBCs, and leukocytic count. Biochemically, High superoxide dismutase (SOD) activity, total protein and globulin levels were recorded in fish fed on 500g/t nucleotide (NT). Immunologically, Lymphocytic proliferation activity, Nitric oxide concentration and Serum lysozyme activity were continuously increased in 250g/t and the 500g/t NT treatment groups along feeding duration. At the end of 8th week, the experimentally reared fish were challenged intraperitoneally with virulent strain of Pseudomonas aeruginosa (0.2 ml of 3× 107 CFU) and the cumulative mortalities were recorded to be lower in nucleotide supplemented groups compared to the control group. In conclusion, the supplementation of fish diet with nucleotides in concentration of 500g/t nucleotide can improve the general health status of P. hypophthalmus via increasing the disease resistance and minimizing stressful conditions.
Nucleoforce™
Pangasianodon hypophthalmus
Growth performance
immunological parameters
Pseudomonas aeruginosa
2020
09
19
405
424
https://ejabf.journals.ekb.eg/article_112821_0ef4a98b5dfe3fa70cdbae5e859f1916.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
GC-MS analysis of bioactive components in six different crude extracts from the Soft Coral (Sinularia maxim) collected from Ras Mohamed, Aqaba Gulf, Red Sea, Egypt
Amir
S. Metwally
Hussein
A. El-Naggar
Khalied
A. El-Damhougy
Mansour
A.E. Bashar
Mohamed
Ashour
Hamdy
A.H. Abo-Taleb
The present investigation was carried out during summer 2016 to determine the possible bioactive components extracts with six solvents (Methanol, Methylene Chloride, EtOH, Ethyl Acetate, Acetone, and Chloroform) from soft coral, Sinularia maxima using GC-MS analysis. Sixty-four compounds were identified from the six extracts. The prevailing compounds in these extracts were Alloaromadendrene (8.8); Hexadecanoic acid, methyl ester (9.4); batilol (12.5); Dimethyl Sulfoxide (2.4); n-Hexadecanoic acid (9.6); Heneicosane (11.6); Octacosanol (12.5). The compounds produced by the studied soft corals possess antimicrobial activity against a number of Gram-positive and Gram-negative bacteria, fungi, and Cancer cell lines, in addition to other pharmaceutical activities.
GC-MS
Soft Coral
Sinularia maxima
bioactive components
Aqaba Gulf
2020
09
20
425
434
https://ejabf.journals.ekb.eg/article_114293_428edc85438d1d93cda6fc9f738a54dd.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Is the change in biodiversity of macro-algae in Alexandria coastal waters related to climate change?
Khalil,
A.N.
Ismael,
A. A.
Halim,
Y.
El-Zayat,
F. M.
Over the past fifty years, the warming hypothesis of Mediterranean waters has been supported by a series of physical and ecological observations. In order to study the potential role of climate change on the distribution and composition of the macroalgae and its associated epiphytic microalgae, a total number of 61 water temperature, salinity, macro-algal samples were collected from Abu Qir area during the period from June 2005 to December 2007.
A 22-year series of sea surface temperature (SST) at Abu Qir Coast (AQ) in Alexandria; from 1985 to 2007 showed a pronounced increase of SST during this period. There was a pronounced change during the last decade with evidence for a stepwise increase in 1994. The maximum SST reached 30˚C compared to 28.1˚C before 1994. On the other hand, the minimum in SST increased since 2005 from 14.3˚C (1985-1994) to 16.9˚C (2006). The most alterations occurred during the winter months with differences of 2.6˚C. Also along with less change during the summer months reached 1.9˚C.
In parallel, long term changes in the algal community structure appear to have taken place during the last 60 years; there is a remarkable decrease in the number of species of macroalgae from 1948 to 2007. The effect of global warming on benthic macroalgae in the AQ area seems to be a decrease in species richness, disappearance of large, canopy-forming species, and disturbed seasonality.
biodiversity
Macro-algae
alexandria
Climate Change
2020
09
21
435
457
https://ejabf.journals.ekb.eg/article_114299_0dd4f585962f659854c2868f0d2b487a.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Intertidal variation of macrobenthos in a saltmarsh habitat, Noakhali coast, Bangladesh
Md. Akram
Ullah
Md. Shafawat
Hossain
M. Belal
Hossain
Mahbubur
Rahman
Macrobenthos play an important role in estuarine ecosystems by re-suspending the bottom layer of water bodies and elevating the nutrients, dissolved gases, and other materials between sediments and overlying water. The study aimed to measure the physicochemical parameter of the study area, to show the intertidal variation of macrobenthos, and to assess the relationship between environmental variables and benthic infauna of saltmarsh habitat along the Noakhali coast. Sediment infauna of saltmarsh was collected by using a hand-held mud corer having an area of 0.01 m2 covering three tidal levels i.e., high tide level (HTL), mid-tide level (MTL), and low tide level (LTL). A little variation was observed among the environmental parameters across three tidal levels. A total of 16 taxa of benthic infauna belonging to Nereidae (37.60%), Nereidae-1 (12.60%), Chironomidae (24.56%), Cerambycidae (2.17%) were found in the three tidal levels. The Evenness index indicated the highest number of similar species were at the sub-stations of LTLs with a value of 1, and the lowest number of similar species was at the sub-station HTL1 with a value of 0.5712. The maximum Shannon diversity (HꞋ) index was found at the sub-station MTL2 with a value of 1.631 and the minimum was at the sub-station LTL2, LTL3 with a value of 0. Margalef species richness ranged from 0 to 0.8808 and the Equabilitty index (J) value from 0 to 0.8808. The diversity profile was high (α=14) at the mid-tide level. The Simpson (1-D) and DO, Shannon ( HꞋ), Margalef, and temperature were significantly correlated (p < 0.05). Again, almost all diversity indices showed a strong correlation with temperature (0.75 ≤ r <1). The information generated here can be used to measure the impact of pollution, to conserve the biodiversity of the study area, and can also be used for further studies.
Macrobenthos
Physico-chemical factors
Saltmarsh
Intertidal variation
2020
09
24
377
390
https://ejabf.journals.ekb.eg/article_117231_d4033347fbc06df93e001b890c91bf59.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Mineralogical and biological study on the bryozoan Calyptotheca alexandriensis collected from Alexandria, Egypt
Ahmed
Elshazly
Rasha
Hamdy
Calyptotheca alexandriensis, has been recently recorded at the Eastern Harbour of Alexandria, Egypt, and described as a new bryozoan species. This study focuses on the mineralogical structure of the calcareous shell of C. alexandriensis and the morphological features of its polypides using XRD, SEM and EDS. The results revealed that the shell of C. alexandriensis contains aragonite in dendritic crystal habit and calcite in the rhombohedral structure. These findings were confirmed by the presence of some aragonite-related cations such as Ba and Pb and other calcite-related cations as Mg. The autozooid polypides have an elongated cylindrical body with a lophophore of 14-16 tentacles.
Bimineralic skeleton
carbonate mineralogy
Polypides
Bryozoa
Chielostomata
2020
09
26
391
402
https://ejabf.journals.ekb.eg/article_114837_2cceb507a9898cfc70391f128f635cdc.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Molecular characterization of rotavirus Group A VP6 gene in Egyptian surface water, wastewater and diarrheal specimens
Marwa
A. Kamel
Ahmed
B. Barakat
Aly
F.M. El-Sayed
Waled
M. El-Senousy
Omar
EL-Farouk Rabia Elsayed
Rotaviruses are the major cause of viral gastroenteritis in infants and young children, producing a significant pediatric disease burden worldwide. The objective of this study was to investigate mutations in the group A human rotaviruses (RoV) in Egypt and their VP6 gene in Egyptian clinical specimens, raw sewage, treated effluents, Nile water, and drinking water samples. A total of 1026 diarrheal specimens were collected from Abo EL-Reesh children hospital between October 2015 and September 2017. Human RoV group A was detected in 22.61% of the clinical specimens. The highest peak of RoV was noticed in autumn and winter. The detection rate of RoV in sewage samples was 88.6% and 65.7% for the influent and effluent samples respectively. Additionally, RoV was detected in 64.29% of river water samples and in 42.86% of drinking water samples. Sequence analysis of the full-length VP6 gene of clinical and environmental samples revealed silent and non-silent mutations compared to RoV Wa reference strain. Different sequences were clearly clustered with genotypes G1P8, G4P6 and G2P4. The low variations between sequences of the VP6 gene in both clinical specimens and environmental samples which contained the same human RoV genotype and also the high similarity between the VP6 genes in samples which contained different human RoV genotypes support the idea of using VP6 as a candidate human RoV recombinant subunit vaccine in Egypt.
Rotavirus
surface water
Wastewater
VP6 gene
2020
09
26
403
423
https://ejabf.journals.ekb.eg/article_115070_210e7fe99172f3699329652092bca9f6.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Species composition and abundance of rotifers (Rotifera: Eurotatoria) in Thrissur Kole wetland, Kerala, India.
Fathibi
K.
Ambalaparambil
V. Sudhikumar
Embalil
M. Aneesh
Kole Wetlands are the major freshwater wetlands of Kerala, which spread over Thrissur and Malappuram districts of Kerala. They are the most productive and threatened wetlands in Kerala. Zooplanktons are heterotrophic animals; floating in the water and act as indicators for water quality. The Rotifers form a major portion of the freshwater zooplankton, serve as an important source of food for many larger aquatic organisms, and an integral part of the aquatic food web. In this context, the study on biodiversity and the abundance of rotifers was carried out from November 2017 to October 2019 from different stations of Trissur Kole wetlands. The physical and chemical parameters of the water were checked regularly for getting the data on the influence of these parameters on the rotifer’s population. The highest diversity and density of rotifers recorded during the pre-monsoon season (H= 3.194, D= 0.954) followed by post-monsoon and lowest during monsoon season (H= 2.658, D= 0.898). A total of 40 species of rotifers belonging to 15 genera and 10 families were recorded. Rotifers of Thrissur Kole wetlands are dominated by Brachionidae (12 species)> Lecanidae (11 species)> Trichocercidae (5 species). Keratella cochlearis (29%) and Brachionus falcatus (25%) of the family Brachionidae are the dominant species seen during all seasons. In conclusion, Rotifers represented the important group of zooplankton throughout the current study, about 50% of the collected Rotifers were new to this area and the species richness and abundance of Rotifer shows a significant relationship with the physical and chemical parameters of the water.
Kole wetland
Kerala
Rotifers
diversity
Seasonal variation
2020
09
27
439
451
https://ejabf.journals.ekb.eg/article_117375_4f16400fe9812c76c0794e0a9eff4514.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Phenotypic and Genotypic characterization of the pathogenic Pseudomonas aeruginosa isolated from cultured Pangasianodon hypophthalmus in Egypt.
Mai
S. Yaseen
Mohamed
Abdelaziz
Dalia
A. Abdel-moneam
Elsayed
Abd-Elhay
Islam
M. Wassif
Marwa
fawzy
Mohamed
Moustafa
This study was conducted on 70 diseased Pangasius hypophthalmus fish collected from different Pangasius fish farms in Egypt. Bacteriological examination revealed the isolation of P. aeruginosa that was biochemically confirmed using MALDI-TOF MS and VITEK 2 compact system. The prevalence and virulence of Pseudomonas aeruginosa were estimated genotypically using species-specific 16S rDNA gene, OprL and ToxA virulent genes for detection of pathogenic strains followed by sequencing analysis. Pathogenicity of isolated Pseudomonas aeruginosa was confirmed by experimental intraperitoneal injection of healthy Pangasius hypophthalmus with positively virulent strains resulting in high mortalities among injected fish.
P. hypophthalmus
P. aeruginosa VITEK 2
16S rDNA gene Virulent genes
2020
10
03
453
467
https://ejabf.journals.ekb.eg/article_117086_622ea406d03c5f6c5e0e4b8eaeb0c6e3.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Chromosomal Studies on the Egyptian Fresh Water Snail Biomphalaria alexandrina by using Transmission and Scanning Electron Microscope
Samah
I. Ghoname
Amira
H. Mohamed
Shadia
M. El- Dafrawy
The present study is an approach to investigate the chromosomal pattern of Biomphalaria alexandrina snails. This may be useful for breaking the host-parasite relationship, which is very specific and dependable on the genetic (chromosomal) status of these hosts. Freshwater snails are essential for the transmission of schistosomiasis by acting as intermediate hosts for the disease-causing parasite. The objective of this study clarifies the four meiotic divisions that begin with Interphase, prophase, metaphase, and anaphase by Transmission Electron Microscope (TEM) and measuring the lengths of chromosomes by Scanning Electron Microscope (SEM). Results showed the number of the chromosomes of B. alexandrina snails N=18, 2N=36 including 4 types of chromosomes, 5 metacentric pairs, 4 submetacentric pairs, 3 acrocentric pairs, and 6 telocentric pairs chromosomes, they were arranged in a descending manner according to the total length that between 12-2 µm. Notably, the present work is the first chromosomal study of B. alexandrina snails by using TEM and SEM. So high-resolution SEM has proven to be a useful tool for chromosomal study.
B. alexandrina
Meiotic division
SEM
TEM
chromosome
2020
10
01
469
478
https://ejabf.journals.ekb.eg/article_117693_1e4982e4f1ba3018a5f9436527f601d7.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Isolation and characterization of Streptomyces sp. NMF76 with potential antimicrobial activity from mangrove sediment, Red Sea, Egypt.
Nayer
M. Fahmy
Streptomyce sp. NMF76 was isolated from mangrove sediment at the Egyptian Red Sea coast by serial dilution method and identified based on morphological and biochemical properties as well as 16s rDNA sequence analysis. The culturing parameters maximizing the antimicrobial activity and the MIC values for the tested pathogens were determined. The ethyl acetate extract was analyzed by GC-MS. Morphological and biochemical characteristics and 16s rDNA sequence analysis affiliated the strain to the Streptomyces genus with accession number, MT0199162. It exhibited the maximum antimicrobial activity when cultured in ISP5 medium containing 3% NaCl and incubated at 30 ᵒC for 14 days with glycerol and L-asparagine as carbon and nitrogen sources, respectively. The strain exhibited antimicrobial activity against Vibrio damsela, S. aureus, E. fecalis and C. albicans and the MIC values were 285,400, 461 and 545 µg/mL, respectively. GC-MS analysis of the extract revealed the presence of Benzene, 1,2,4-trimethyl (21.47 %), 2H-Pyran-3-ol,tetrahydro-2,2,6-trimethyl-6-(4-methyl-3-cyclohexen-1-yl)-, [2S- [2à, 5á (R*) ] ]- (18.35 %) , Benzene, 1-ethyl-3-methyl- (15.76 %), and undecane (9.96 %) as major components. Further studies are required to purify and elucidate the structure of the antimicrobial agent.
Streptomyces
antimicrobial activity
culturing conditions
Red Sea
Mangrove
GC-MS
2020
10
07
479
495
https://ejabf.journals.ekb.eg/article_117578_bb4896b30973d37d6ece4ba6f9f69cd9.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Utilization of marine algae as a carbon source for bacterial cellulose production by Gluconacetobacter xylinus
Maha
Beliah
Hassan
Ibrahim
Aida
M. Farag
Amani
El-Ahwany
Soraya
Sabry
Bacterial cellulose (BC) has received attention due to its many advantages such as high mechanical strength, purity, crystallinity, liquid-absorbing capabilities, and biodegradability. The most discrepancy associated with BC production is its high cost which higher than the plant cellulose. So, the present study was aimed to improve BC production by using reducing sugar from algae as a cheaper carbon source. Replacing glucose with 20 g/l of reducing sugars extracted from P. oceanic increased BC yield to about 5.7g/l, which is higher than on glucose (3.7 g/l). The maximum BC production was obtained at an incubation temperature of 30°C and pH 6.5. According to experimental results of Plackett-Burman design and the steepest ascent methods, the optimal medium for BC production was (g/l); reducing sugar, 30; yeast extract, 7; peptone, 7; Na2HPO4, 7.2; citric acid, 0.2, pH 6, for 15 days of incubation at 30°C under static condition. The produced BC was examined and characterized by SEM, FT-IR Spectroscopy analysis, and XRD. This is may be the first report on the optimization of the fermentation medium using marine algal extract as the carbon source for the highest BC production (12.7g/l) by G. xylinus ATCC 10245.
bacterial cellulose
marine algal extract
G. xylinus
P. oceanic
carbon source
2020
10
07
497
518
https://ejabf.journals.ekb.eg/article_117323_a9abd372d33616e4e19e8df928a77c04.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Effects of dietary potassium diformate (KDF) on growth performance and immunity of the sea bass, Dicentrarchus labrax, reared in hapas
Ebtehal
E. Hussein
Ahmed
M. Ashry
Mahmoud
M. Habiba
An experimental investigation was conducted to examine the effects of potassium diformate (KDF) with different levels of (0, 2, 3, and 4 g kg-1 diet) in the diets for European sea bass, Dicentrarchus labrax juveniles on the growth performance, feed utilization, and haematobiochemical parameters for 90 days. Latterly, the highest final weight (35.1 g) and weight gain (29.6 g) were detected in the fish fed diet supplemented with potassium diformate at the level of 2 g kg-1 (KDF2). Significant differences in the survival rate (%) were observed among the experimental groups, enhanced by increasing the level of KDF in the experimental diets and the highest value (98.89%) was observed in the fish fed diet supplemented with potassium diformate at the level of 4 g kg-1 (KDF4). Increased values of white blood cells, red blood cells, hemoglobin, and hematocrit were observed in the fish fed KDF2 diet. Serum analyses of sea bass fingerlings fed the experimental diets with different levels of KDF had a significant (P < 0.05) effect on the immunophysiological parameters such as phagocytic percentage and lysozyme activity. The increasing levels of KDF in the experimental diets did affect the phagocytic percentage and the lysozyme activity positively (P < 0.05). It can be concluded that the dietary potassium diformate (KDF) has a positive effect on the growth performance, feed utilization and survival rate of European sea bass fingerlings. These results show the potential for KDF application in the cultivated sea bass juvenile diets to serve as a growth promoter and a basic defense module when given at 2 or 3 g kg-1.
European Sea bass
Growth
immunity
nutrient utilization
potassium diformate
2020
10
04
519
532
https://ejabf.journals.ekb.eg/article_117517_d66d0fc680723f4c5896fdd7053e5acb.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Molecular identification and phylogenetic relationship of Erugosquilla massavensis (Kossmann, 1880) from the Mediterranean Sea, Egypt
Amira
T. Abo-Hashesh
Fedekar
F. Madkour
Wafaa
S. Sallam
Amro
M. Hanora
Hanaa
K. Ashour
The Erythraean species of mantis shrimp, Erugosquilla massavensis, has been reported as the first Lessepsian migrant stomatopod to the Mediterranean Sea in 1933, off Alexandria, Egypt via the Suez Canal. Currently, it extended to the middle and western Mediterranean competing with the native spot-tail mantis shrimp Squilla mantis (Linnaeus, 1758). The continuous increase of invasive species to the Mediterranean claimed the necessity to update and revise the identification of those early migrants. The present study aimed to confirm the morphological identification of E. massavensis from the coast of the Egyptian Mediterranean Sea using the DNA barcoding gene cytochrome oxidase subunit I (COI) and conducting a phylogenetic analysis. Genomic DNA of samples collected from the Mediterranean Sea at Port Said in 2016 was extracted and COI was amplified and sequenced. Our phylogenetic analysis revealed that E. massavensis (MH447072 and MH447073) constitutes a single monophyletic clade and appeared more linked with E. woodmasoni than the Japanese mantis shrimp < em> Oratosquilla oratoria (divergence value < 3%). The phylogenetic relationship between E. massavensis, E. woodmasoni, and O. oratoria was confirmed by the Neighbor-Joining tree. The present study confirmed the morphological identification and document, for the first time in GenBank/EMBL/ DDBJ genetic databases, the genetic status of E. massavensis from the Mediterranean of Egypt using COI.
Squillidae
Erugosquilla massavensis
COI gene
Phylogenetic analysis
2020
10
01
533
545
https://ejabf.journals.ekb.eg/article_117576_e0af4ff309b3a4ec1dd634a60a1a902f.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Growth and Economics of Silver Barb (Barbonymus gonionotus) in Rice-fish-vegetable Integrated Culture System at Different Stocking Densities in a Rainfed Arid Zone
Md. Abu Sayed
Jewel
Sarder
M. W. Ali
Md. Ayenuddin
Haque
Md. Giush
U. Ahmed
Sonia
Iqbal
Usman
Atique
Mst. Eliza
Pervin
Alok
K. Paul
Sustainable integrated farming involving the combination of rice-fish-vegetables requires advanced technology to be adopted in crop production in arid zones characterized by red or yellow soil. In the present study, we used suitable and varying stocking densities of Silver barb (Barbonemus gonionotus) and evaluated in a structured production and economic framework under four treatments (T1, T2, T3, and T4) assigned with a stocking density of 10, 20, 30 and 40 fish/decimal, respectively. We used standard methods of water, soil, and plankton monitoring of the rice field. The study showed that lower stocking density provided the fish with more spaces and less competition for food resulting in higher growth performance in T1 compared to other treatments. Although stocking density did not show any significant (P>0.05) effect in rice, straw and vegetable production in all the treatments, the highest rice and straw production at T4 could be ascribed to the improvement in soil fertility by the accumulation of fish excreta and subsequent release of nutrients from the soil by the higher number of fish in that treatment. The best fitted polynomial regression line obtained between gross yield and net yield with different stocking densities of Silver barb described an inevitable fluctuation in net yield of fish with increasing stocking density. Despite the stable growth performance of fish in T1, a combined effect of lower total input cost, higher yield of fish and rice, and economical vegetable production, T2 showed a significantly (P<0.05) higher total return. Furthermore, the benefit-cost ratio (BCR) for rice-fish-vegetables integrated culture system in the rain-fed rice field was also high. In conclusion, this study revealed that maintaining a stocking density of 20 fish/decimal was economically profitable for rice-fish-vegetables integrated culture systems in arid zones on a global scale.
Rice-fish-vegetables
stocking density
Rain-fed
Soil fertility
Arid zone
2020
10
01
459
476
https://ejabf.journals.ekb.eg/article_117948_405d551660f1d1c2bbe048b4e5701d05.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Life history traits of the Barred spiny eel Macrognathus pancalus (Hamilton, 1822) in a wetland ecosystem
Md. Ataur
Rahman
Md. Abul
Bashar
Zannatul
Mawa
Obaidur
Rahman
Md. Abdus
Samad
Md. Sarower
E-Mahfuj
Md. Akhtarul
Islam
Most. Shakila
Sarmin
Md. Raqibul
Islam
Md. Yeamin
Hossain
The Barred spiny eel Macrognathus pancalus (Hamilton, 1822), is a very popular and nutritious fish food in south Asia. Life history traits including LFD, growth types, conditions (KA, KF, KR), relative weight (WR), form factor (a3.0), sexual maturity (Lm), and natural mortality (MW) of Macrognathus pancalus were estimated from 484 specimens collected (January to December 2018) at Wetland ecosystem known as Gajner Beel, in northwestern Bangladesh through different types of local fishing gear. Biometric measurements (Lengths, Weight) were measured through digital slide calipers and electronic weight balance with 0.01 cm and 0.01 g precision. In our study total length ranged from 6.00-18.80 cm and body weight ranged from 0.53-27.56 g for M. pancalus. The growth pattern was indicated positive allometric based on the estimated b values for this species. Allometric condition factor (KA) was the best condition factor among other types of condition factors for the wellbeing of M. pancalus. The observed a3.0 was 0.0055,Lm was 11.16 cm TL, and MW was 0.79for M. pancalus Gajner Beel. Finally, we conclude that the finding of this research will be supportive of the sustainable conservation of M. pancalus in Bangladeshi and neighboring waters.
Life history
sexual maturity Macrognathus pancalus
Wetland Ecosystem
Gajner Beel
2020
10
01
425
438
https://ejabf.journals.ekb.eg/article_121162_8374c503740f68ecce951946945a53c5.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2020
24
6
Using Macroinvertebrates Metrics in Assessing the Ecological Status of Ismailia Canal, Egypt
Marian G.
Nassif
Macroinvertebrate communities from a man-made canal called Ismailia Canal were analyzed seasonally in order to assess changes in their composition and structure over time as well as to study the canal’s ecological status. The performance of the Biological Monitoring Working Party (BMWP) and Average Score Per Taxon (ASPT) indices, in the studied 10 stations, have been calculated and compared with the diversity index (H`) and the Intercalibration Common Metrics Index (ICMi) as well. Annelida, Insecta, Mollusca, and Crustacea composed the main groups of the benthic fauna in Ismailia Canal with an average density of 454 ind./m2. Seasonally, winter exhibited the lowest population density and autumn revealed the highest density. Regarding Shannon Wiener diversity index, stations 1 and 2 represented the highest value (H`= 1.8) while the lowest biodiversity value was in station 5 (H`= 0.11). The BMWP scores revealed the first sector of the canal (stations 1 and 2) in moderate ecological status; however, stations 5 and 10 exhibited the poorest status. The Average Score Per Taxon (ASPT) divided the canal into two sections; the moderate ecological status (stations 1, 2, 3, 4, 7, and 8) and the poor ecological status (stations 5, 6, 9, and 10). Due to the presence and absence of some of the bioindicator groups, values of the STAR_ICM index varied from 0.20 to 1.64. However, the current investigation revealed long-term monitoring of ecology and diversity of macrobenthic assemblages is required for the sake of its conservation. Developing an index that suits the Egyptian hydromorphological status is a crucial issue.
Macroinvertebrates
ecological status
Ismailia Canal
ICMeasy
BMWP
ASPT
biodiversity
2020
09
14
439
451
https://ejabf.journals.ekb.eg/article_313156_d45ba0f9fc700ba72b97af3d86c55f97.pdf