The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
11
1
2007
01
01
EFFECT OF SOME ENVIRONMENTAL PARAMETERSON CROSSING PROCESS OF TARGET SNAILS TO SCHISTOSOMA MANSONI INFECTION
1
21
EN
Abdel - Hamid
Abdel - Hamid
From Medicinal Chemistry Department, National Research Cente
Rehab
Abdel - Megeed
From Medicinal Chemistry Department, National Research Cente
Mona
Tonsy
Zoology Department, Faculty of Science
Samia
Abd El -Wahab
Zoology Department, Faculty of Science
10.21608/ejabf.2007.1912
The biological control of the snails intermediate hosts of Schistosoma mansoni* is one of the accepted options to fight schistosomiasis . For the control of schistosomiasis , one strategy is based on the premise that resistant snails to parasite infection could be used as biological competition agents to replace existing susceptible snails in endemic areas. Therefore , the current studv was designed to investiuatejihe influence of] environmental iactors on copulation behaviour of Biomphalaria snails under various laboratory conditions^ These factors are : light, darkness , starvation , pH and association with non- target snail species mseid^r to obtain information on the ecological conditions for reproduction of the resistant species.The data obtained showed that , copulation behavior was enhanced by different environmental factors and revealed the best modular system for snail reproduction . Itoaas-aBo noticed that, non-target snail species or the resistant snails affect crossing among the target snails .Moreover, resistant snails recorded more tolerance against abnormal environmental conditions.
Schistosoma mansoni,Biomphalaria^ biological control,Environmental parameters
https://ejabf.journals.ekb.eg/article_1912.html
https://ejabf.journals.ekb.eg/article_1912_603cf7dad8907a7d855a8f5a7e948fcf.pdf
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
11
1
2007
01
01
MOLECULAR GENETIC VARIATIONS AMONG ADJACENT POPULATIONS OF FRESHWATER SNAILS THAT ARE TARGET AND NON-TARGET TO SCHISTOSOMA INFECTION
23
51
EN
Abdel - Hamid
Abdel - Hamid
Medicinal Chemistry Department, National Research Center
10.21608/ejabf.2007.1913
Schistosomiasis is one of the most important public health problems in many developing countries and it is the prime health problem in Egypt. Since the infection of Biomphalaria alexandrina and Biomphalaria glabrata snails by the parasitic trematode Schistosoma mctrisoni depends on the complex interactions by both parasite and snail genes , genetic conttal is one of the successful means for control of schistosomiasis . A number of laboratory derived stocks of B. alexandrina and B. glabrata have been used to sort out this complex genetic relationship . In the present study genetic variations between adjacent snail populations., target ( B. alexandrina and p. glabrata) and non-target ( Lymnaea truncatulaLand Physa acuta ) to Schistosoma infection was investigated using DNA amplification by random amplified polymorphic DNA - polymerase chain reaction ( KAPD-PCR ) at different developmental stages . The amplification products were analyzed on 6 % polyacrylamide gel/and siamed with silver. Eighteen primers were selected, since they have previously *been useful to detect polymorphism among B. alexandrina and / or B. glabrata .The results showed polymorphism with 3 primers; OPA-01, OPA-02 and OPA-18 . Stable reproducible RAPD markers with utilized primers OPA-01, OPA-02 of B. alexandrina and B. glabrata showed highly genetic variation among different snail types and ages . £uife©r»mere- Hybrid snails obtained genetic polymorphism at one strain ( susceptible or resistant ) among different developmental stages by primers OPA-01 , OPA-02 and OPA-18 .u|e results resolved the problem of susceptibility / age association of ttttermediate: snail host. The~^^sen^-&tudy-showed-that-by. ^comparing iargets (both susceptible and resistant strains ) withiiar^target^ecies to Schistosoma infectiojii^mere is a genetic polymorphism^ specific for resistant snails .and contirmed in non-target species obtained by primer OPA-01 /"Since, the resistant character is heritable like susceptibility"; it would be beneficial to select actively resistant snails and mass culture -them to increase the proportion of alleles for insusceptibility as a possible mean for biological control of schistosomiasis in natural population.
Schistosomiasis,Biomphalari,Schistosoma,genetic Control.polymorphism,biological control,Molecular marker
https://ejabf.journals.ekb.eg/article_1913.html
https://ejabf.journals.ekb.eg/article_1913_450c4b1d9a016f12a55292556e9f731e.pdf
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
11
1
2007
01
01
SYNERGISTIC REACTIONS BETWEEN VITAMIN EAND SELENIUM IN DIETS OF HYBRID TILAPIA (OREOCHROMIS NILOT1CUS X OREOCHROMIS AUREUS) AND THEIR EFFECT ON THE GROWTH AND LIVER HISTOLOGICAL STRUCTURE
53
81
EN
Ahmed
El-Hammady
Fish Nutrition Lab.& Fish Biology Lab.,National Institute of Oceanograhphy
and Fisheries, Cairo, Egypt.QOl Kasr El-Aini Street).
Midhat
El - Kasheif
Fish Nutrition Lab.& Fish Biology Lab.,National Institute of Oceanograhphy
and Fisheries, Cairo, Egypt.QOl Kasr El-Aini Street).
Seham
Ibrahim
Department of Zoology, Faculty of Science, Benha University, Benha, Egypt.
10.21608/ejabf.2007.1914
Eight experimental diets representing two levels of vitamin E (low 100 IU /kg diet and high 300 IU/kg diet) with four levels of selenium ( 0;2 ; 4 ; 8 mg/kg diet ) were tested on hybrid tilapia (-Qr-niloiieusX JX~mweu8~ ) for a period of 120 days . "The study was performed in outdoor cement ponds, each divided to units by nets with an area of 10m each. Each treatment was performed in duplicates, using 40 experimental fish with an initial weight of 48.83 g on the average . After the adaptation period, the fish were fed on the experimental diets at a rate of 3% of the treatment bibmass dialy, divided into two equal portions at 10. 0 a.m and 2 p.m. Water temperature ranged between 28J to 3L5 °C during the experimental period. Water quality parameters (dissolved oxygen, ammonia oED were within the permissible levels for tilapia. Results obtained^ surhmenzed/in the followingr 1-Hybrid tilapia fea on 2mg Se with 300 IU vitamin E/kg diet had significantly higher (p < 0.05) specific growth rate (SGR), feed conversion efficiency and also improved feed conversion ratio than that fed on the other diets.2-At constant dietary vitamin E level, total serum protein increased with increasing Se level up to 8 mg/ kg diet.3-Fish fed on high level of supplemented vitamin E (300 IU/kg) diet without selenium deprivation, showed increased growth rates and improved feed conversion rate than that fed on the low vitamin E (lOOIU/kg dry diet).4 - The histological investigation showed remerkable effects in the liver tissue of hybrid tilapia fed on dietary Se- supplemented level up to 8mg/kg diet with low vitamin E (lOOIU/kg dry diet) with different degrees of injuries, including blood vessels, hemorrhages and degeneration in hepatic cells, dilatation, odema and hemosidren, hemolysis, necrosis and activation in nuclear division.This study suggests that supplementation of Vit. E 300IU/kg with selenium up to 2 mg / kg dry diet for hybrid tilapia is warranted to increase growth rate and prevent fish from increased concentration of waterborne Se up to toxicity levels.
selenium,hybrid tilapia/growth,feed efficiency,histology,•liver 5 Vitamin E
https://ejabf.journals.ekb.eg/article_1914.html
https://ejabf.journals.ekb.eg/article_1914_bf2284a73d829138430ca91da82ed4a2.pdf
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
11
1
2007
01
01
GENETIC SIGNATURE OF SOME HEMICHROMIS BJMACULATUS FISH POPULATIONS BASED ON MUSCLE PROTEIN POLYMORPHISM
83
100
EN
Mohamed
Rashed
Genetic Lab, National institute of oceanography and fisheries,
Cairo- Egypt
Ashraf
Abd EL-Rasek
Genetic Lab, National institute of oceanography and fisheries,
Cairo- Egypt
Ezzat
Badawy
Genetic Department, Faculty of agriculture, Ain Shams University,
Cairo- Egypt
Yasser
Saad
Genetic Department, Faculty of agriculture, Ain Shams University,
Cairo- Egypt
10.21608/ejabf.2007.1915
Genetic signature of some Egyptian populations of the fish Hemichromis bimaculatus was detected using some isozyme systems including: Malate dehydrogenase (Mdh), Malic enzyme (ME), Esterase (Est) with three specific esterase substrates and protein polymorphisms. The applied samples were obtained from three distantly Egyptian locations namely, Qariater (Q population), Wadi EL-Rian (R population) and Lake Manzala (Ml and M2 populations). The samples were extracted from skeletal muscles. Native PAGE (10% polyacrylamide gel under non denaturing conditions) and SDS-PAGE were used ta separate the saline soluble muscle proteins. The results indicated that each population had a unique banding pattern. The similarity was high within each population. The dendrogram indicated that (Ml) and (M2) were much related to each other, while (Q) population was distantly related to the other investigated populations.
Genetip simikrity,Isozyme,protein polymorphism,Hemicfiromis bimaculatus,SDS-PAGE
https://ejabf.journals.ekb.eg/article_1915.html
https://ejabf.journals.ekb.eg/article_1915_64a075498797e00f3157fd85669b9722.pdf
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
11
1
2007
01
01
ASSESSMENT OF THE ADVERSE EFFECTS OF THIOBENCARB AND DITHIOPYR HERBICIDES ON THE NILE TILAPIA, OREOCHROMIS NILOTICUS
101
121
EN
Iman
Abumourad
Department of Hydrobiology, National Research Centre, Giza, Egypt
Hossam
Abbas
Department of Hydrobiology, National Research Centre, Giza, Egypt
Ashraf
El-Badawi
Central Lab. For Aquaculture Research-Abbasa, Abo-Hamad,
Sharkia- Eevnt
Mohamed
Authman
Department of Hydrobiology, National Research Centre, Giza, Egypt
10.21608/ejabf.2007.1922
The herbicides Thiobencarb and Dithiopyr are largely used as weed killers, especially in the rice fields, where cultured tilapia can be exposed to the adverse effects of such herbicides. Leaching of the herbicides in the soil could also affect the wild fish in the natural habitats and so considered as chemical water pollutants. To assess the adverse effects of these herbicides on the Nile tilapia in this study; Lcso was determined and recorded as 720jig/l and 280jig/l for Thiobencarb and Dithiopyr respectively. Nile tilapia were exposed to acute and chronic exposures of Thiobencarb and Dithiopyr as single and mixed treatment^ 'The residue of both herbicides in fish tissues was estimated, and revealed that the highest value was detected in the liver, while the lowest was in the brain. Biochemical and genetic studies were applied to evaluate the toxicity and alterations due to Thiobencarb and Dithiopyr in Nile tilapia. deviated values of serum and muscle total protein and alkaline pho&phatase were observed in acute and chronic cases with a synergistic action in the case of the combination of the two herbicides. Concerning genetic studies, utilization of the apoptosis technique in vitro resulted in apoptotic bands in. the spleen, kidney, and liver. This result was confirmed by the micronuclei findings, which indicated an alteration of the cell division in gills as a naturally exposed organ to the polluted water in case of acute and chronic exposure/The histopathological studies revealed frequent degenerative changes in the parenchymatous organs, widespread necrosis and activation of the melanocytes and the severity of changes appeared in the long-term exposure to mixed Thiobencarb and Dithiopyr. However, this study confirmed the cytotoxicity of the two largely used weed controllers, Thiobencarb, and Dithiopyr on the Nile tilapia.
missed
https://ejabf.journals.ekb.eg/article_1922.html
https://ejabf.journals.ekb.eg/article_1922_d48b4aaec34c453129a8597f17f6c4e1.pdf
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
11
1
2007
01
01
STUDIES ON THE EFFECT OF THIOBENCARB HERBICIDE ON SOME BIOLOGICAL, PHYSIOLOGICAL, BIOCHEMICAL, HISTOLOGICAL AND GENETIC ASPECTS OF NILE TILAPIA, OREOCHROMIS NILOTICUS
123
150
EN
Hossam
Abbas
Department of Hydrobiology, National Research Centre, Giza, Egypt
Mohammad
Authman
Department of Hydrobiology, National Research Centre, Giza, Egypt
Ashraf
El. Badawi
Central Lab. For Aquaculture Research-Abbassa, Abo-Hamad,
Sharkia, Egypt.
Iman
Abumourad
Department of Hydrobiology, National Research Centre, Giza, Egypt
10.21608/ejabf.2007.1923
This study was undertaken to evaluate the impact of short-term and long-term exposure to the herbicide thiobencarb, wh*ehr4s~tege^ ;$ged~^"M^^-GQnta^ rice cultivation in Egypt,., on ^Ue tilapia; Orepchromis niloticusrLQi[\d\ and sublethal effects of thiobencarb on physiological, biochemical and histological parameters were also studied on the fish as a function of exposure time. Exposure of O. niloticus to lethal and sublethal levels of thiobencarb resulted in significantly (PO.05) lower values for liver and muscle glycogen, total protein and total lipids compared with the control group. In contrast, there was a significant increase (P<0.05) in muscle ash, water content, glucose, cholesterol, creatinine, Uric acid and Lactate dehydrogenase (LDH) in the herbicide-treated group, while aspartate aminotransferase (AST) and alanine aminotransferase (ALT) showed a fluctuated activity in both of acute and chronic exposure. The data indicated that the residue of thiobencarb had a higher value in the liver, while the lowest value was in the brain, Histological sections in gills, kidneys, spleen and liver of treated fish revealed pathological alterations. Cytotoxicity assessment was also included. Fish exposed to thiobencarp showed a significant reduction in growth parameters. The genetic investigations showed breaks, gaps, centromeric attenuation, centric fusion and deletion were the common aberrations. The mean percentage of aberrations were timedependent.
tilapia,Cichidae,Growth,Dynamics,Lake Manzala,Egypt
https://ejabf.journals.ekb.eg/article_1923.html
https://ejabf.journals.ekb.eg/article_1923_9e442f97023013e886f62233273fb06a.pdf
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
11
1
2007
01
01
GROWTH PERFORMANCE OF FISH REARED UNDER DIFFERENT DENSITIES IN SEMI-INTENSIVE AND EXTENSIVE EARTHEN PONDS
151
170
EN
Hanan
El-Nahas
Medicinal Chemistry and Biochemistry; Environmental Research and
Medical Malacology Departments.
Fatma
EI-Deeb
Medicinal Chemistry and Biochemistry; Environmental Research and
Medical Malacology Departments.
10.21608/ejabf.2007.1924
Effect of stocking density on fish performance has been investigated in earthen ponds over five months of growing period in a polyculture system including Nile tilapia, common carp, silver carp, mullet and African catfish. Experimental ponds have been allocated to various stocking rates of 1, 1.25, 1.5, 1.75, 10 and 14 fish/m3. The treatments of 10 and 14 fish/m3 represented the semi-intensive system, while lower densities represented the extensive calture system. Fish in all treatments received 25% crude protein pelleted fish feed at a rate of 3% of body weight that was adjusted throughout the growing period. Feed was offered twice/day for five days/week. Water quality has been monitored monthly. The physico - chemical analysis showed two distinct sets of values for the extensive and the semi-intensive stocking densities concurred with for the main water quality parameters, whereas the values of pH, E.C., salinity, alkalinity, hardness, total phosphorus and orthophosphate were significantly higher in extensive system than the semi-intensive one, while values of D.O, SD, NH3, NO2, NO3 were higher in the semi-intensive system compared to the extensive system. Plankton communities expressed as Chlorophyll "a" was significantly higher in the extensive ponds. Average production was significantly higher in semi-intensive ponds compared to the extensive ponds. However, for the main fish species (Nile tilapia), the average weight as well as the daily gain did not vary among treatments, while there were some differences with regard to average weight for other species. There was no difference concerning the condition factor in all treatments for any of the tested species. The economic analysis revealed increases in variable costs as well as higher net returns as the stocking density increased. However, the rate of return to capital percentage has decreased with the increase of the stocking density. The overall analysis suggested the semi-intensive system to be the most profitable system.
polyculture,intensive,extensive,water quality,Plankton,Growth performance,tilapia,Mullet,carp,catfish
https://ejabf.journals.ekb.eg/article_1924.html
https://ejabf.journals.ekb.eg/article_1924_204a3882d503097d77284c89cdd4cfd4.pdf
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
11
1
2007
01
01
FOOD AND FEEDING HABITS OF THE EGYPTIAN SOLE SOLEA AEGYPTIACA (CHABANAUAD, 1972), FROM PORT SAID, MEDITERRANEAN SEA, EGYPT
171
190
EN
Mariam
Sharaf
Departments of Zoology
Hebatullah
Laban
Departments of Zoology
Ashraf
Ahmed
Marine Science , Faculty of Science, Suez Canal University, Ismailia, Egypt.
10.21608/ejabf.2007.1925
The food and feeding habits of the Egyptian Sole, Solea aegyptiaca (Chabanauad, 1972) were studied in Port Said area, Mediterranean Sea during the period from October 2004 to September 2005. The annual composition of the diet, the intensity of feeding, seasonal variation of diet composition and variation of diet with length, showed a low-intensity of feeding activity of S. aegyptiaca, and indicated that they feed on a wide variety of prey types (polychaetes, mollusks, amphipods, sediments and small quantities of crustacean fragments, Ascidia, fish parts, sea grasses, brittlestars, unknown medusae and algae), with a limited variation in diet among seasons. The prey types and size differed from juvenile to adults, juvenile ingested only 5 small prey items; while adult had eaten about 11 of large sized prey items. The diet composition of Egyptian sole is indicative of a generalist feeding strategy.
Solea aegyptiaca,stomach cpnt&nts,feeding,Port Said -Mediterranean-Sea
https://ejabf.journals.ekb.eg/article_1925.html
https://ejabf.journals.ekb.eg/article_1925_92dec9b0adbdd36ff48fd06b4e6a27a5.pdf
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
11
1
2007
01
01
LEVELS OF TRACE METALS IN MARINE MACRO ALGAE FROM BITTER LAKES, SUEZ CANAL, EGYPT,
191
205
EN
Adel
Mohamed
National Institute of Oceanography and Fisheries, Suez
Hoda
Mohamed
National Institute of Oceanography and Fisheries, Suez
10.21608/ejabf.2007.1926
The levels of trace metals (Ni, Co, Cu, Fe, Zn, Cd and Pb) were determined in ten macroalgal species (green algae: Enter omorpha compressa and Cladophora albida; brown algae:, Sargassum dentifolium, Cystoseira yrica, Padina pavonia; red algae: Acanthophora najadiforrnis, Laurencia papillosa, Ceramium tenuissima, Polysiphonia figariana, Hypnea cornuta) collected from six sites along Bitter lakes (Suez Canal, Egypt). The relative abundance of trace metals in algal species decreased m the order (Fe> Zn> Ni> Cu> Pb> Co> Cd). The highest concentration of Co ( 1.17 jig/g dry wt.) and Pb ( 8.00 ug/g dry wt.) were found in brown algae C. myrica, while Cd ( 1.00 ug/g ) and Cu ( 16.92 ug/g dry wt) were "recorded in P. pavonia and S. dentifolium^ respectively. In red algae, the highest value of Ni (9.28 ug/g dry wt.), Zn (36.50 ug/g dry wt.) and Fe (502.20 ug/g dry wt.) were observed in A. najadiformis, P. figariana^and H. cornuta, respectively. According to the local variation of metals in the investigated area, the highest values of most metals (Ni, Cu, Fe, Zn and Pb) were recorded in front of Fayed (site III) which is the biggest village in the bitter Lakes area and receives agricultural and domestaic drains in addition to the effluent from the vessels crossing the Suez Canal. Inter - elemental relationships were studied and showed positive significant correlation (p < 0.05) between Ni - Fe (r = 0.63), Ni - Zn (r = 0.47), Co - Fe (r = 0.52), Zn - Cd (r = 0.41) and between Zn-Pb(r = 0.49).<br />The present study recommended that the pollution sources at Fayed, which considered as fishing and recreational marine area, must be controlled. As well as, some algal species can be used as a good target for monitoring metals pollution in Bitter Lakes.
trace metals,mapme macroalgae,Bitter Lakes,Suez Canal
https://ejabf.journals.ekb.eg/article_1926.html
https://ejabf.journals.ekb.eg/article_1926_2e4e6b4e2a7164df1a788d0e8cbdb020.pdf
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
11
1
2007
01
01
PIGMENTS AND IODINE CONTENT OF SOME SEAGRASSES ALONG THE EGYPTIAN RED SEA COAST
207
220
EN
Adel
Mohamed
National Institute of Oceanography and Fisheries, Suez
Yasser
Geneid
National Institute of Oceanography and Fisheries, Suez
10.21608/ejabf.2007.1927
Pigments (chlorophyll a, chlorophyll b and p-carotene) and iodine concentrations were determined in five species of seagrasses (Halophila stipulacea, Halodule uninervis, Halophila ovalis. Thalassodendron ciliatum and Thalassia hemprichii) collected from sixteen sites along the Red Sea, Gulf of Aqaba and Suez Gulf. Chlorophyll a has the highest average concentration of pigments investigated (5.066 mg/lOOgm), while very low contents of P-carotene with an average of 0.0004 mg/lOOgm were recorded, The minimum concentrations of chlorophyll a, chlorophyll b and P-carotene were recognized at Ras Abu Somah site, while the maximum was found at El Kafrawy Project (12.158 mg/lOOgm) H. stipulacea had the highest values of Chlorophyll a, while H. Uninervis had the highest concentration of Chlorophyll b (10.918 mg/100gm): High significant correlation was found between Chlorophyll a and Chlorophyll, b (r = 0.779). Low iodine contents were found in the investigated seagrass species, ranged from 0.021 for T. ciliatum to 0.038 g/lOOgm for H. uninervis, with an average of 0.031 g/lOOgm. The highest mean of iodine contents within seagrasses species was recorded in T. hemprichiL while their lowest mean was recognized in T. ciliatyjci&fExcQpX for the highest reading of T. ciliatum (0.026 g/lOOgm) at Ras Burkha (Gulf of Aqaba), all the minimum and maximum values of iodine in the studied seagrasses were recorded at the Red Sea Proper sites.
Seagrassej,pjgrnenX chlorophylls,P-carotene,Iodine,Gulf of S^% Gulf of Aqaba,Red Seay Egypt
https://ejabf.journals.ekb.eg/article_1927.html
https://ejabf.journals.ekb.eg/article_1927_1f88253fc344d6db1822efccb27e8152.pdf
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
11
1
2007
01
01
SEASONAL DISTRIBUTION AND COMMUNITY STRUCTURE OF MACROALGAE ALONG PORT SAID COAST, MEDITERRANEAN SEA, EGYPT
221
236
EN
Fedekar
Madkour
Marine Science Department, Faculty of Science, Suez Canal
University, Ismailia, Egypt.
Gihan
El-Shoubaky
Biological and Geological Sciences Department, Faculty of Education,
Suez Canal University, Port Said, Egypt.
10.21608/ejabf.2007.1928
Seasonal variations in macroalgae community inhabiting Port Said coast were investigated during the period from summer 2004 to spring 2005. Species composition and percent cover of macroalgae were studied in four sites distributed along the coast, representing different habitats. Some hydrographic parameters (temperature, salinity, pH, dissolved oxygen, phosphate, nitrite, nitrate and silicate) were measured to determine the water characteristics influencing the studied sites. The study revealed the presence of 55 species, of them, 17 species have not been recorded previously in this area. The macroalgae comprised 31 species of Rhodophyta, 21 species of Chlorophyta and 3 species of Phaeophyta. Of the recorded species, 16 species occurred as epiphytes; most of them belonging to Rhodophyta. The most abundant species were Cladophpora prolifera, Enteromorpha compressa, E. prolifera, E. flexuosa, E. intestinalis, E. ralfsii, Ulva fasciata and U. rigida from Chlorophyta, and Gelidium crinale and Hypnea cornuta from Rhodophyta. There were relatively seasonal and spatial differences in the distribution patterns of species composition and abundance. Autumn and summer were the most diversified seasons. Site I which was away from any effluent, rich and diversified flora were observed relative to the other sites, with the highest abundance especially in Rhodophyta. The influence of the brackish water of Lake Manzala was obvious on the vegetation at site IV and sometimes at site III.
Macroalgaej eommu&ky,Seasonal variation,Epiphytism,Port Sajdi Mediterranean
https://ejabf.journals.ekb.eg/article_1928.html
https://ejabf.journals.ekb.eg/article_1928_6edeef910d8d3e7946b082f2bc0abea2.pdf
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
Egyptian Journal of Aquatic Biology and Fisheries
1110-6131
2536-9814
11
1
2007
01
01
تأثير بعض العوامل البيئيه علي التکاثر الخلطي في قواقع الماء العذب المستهدفه لطفيلي البلهارسيا
1
11
EN
10.21608/ejabf.2007.1929
https://ejabf.journals.ekb.eg/article_1929.html
https://ejabf.journals.ekb.eg/article_1929_970bf3b9efba70fde18f8291d55fb524.pdf