@article { author = {Abd El-Nasser, Gamal r}, title = {STUDIES ON THE EFFECT OF NATURAL FEEDS IN DIFFERENT COMBINATIONS ON GROWTH AND SURVIVAL OF CLAR1AS GARIEPINUS LARVAE}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {1-9}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1705}, abstract = {The suitability and potential of three live food were evaluated for feeding Clarias gariepinus fry. Three-day old African catfish larvae (5-7 mm total length, 1.2-3.0 mg body weight) were stocked at a density of 100 larvae per liter in nine glass aquaria 150 X 50 X 50 cm each, representing three treatments. Each treatment was represented in three replicates). Fish were reared for 35 days on three different feeding regimes using Artemia salina, Moina macrocopa and Brachionus plicatilis as live food. Larvae of all treatments were fed on Brachionus at a density of 10 per ml in the first four days. From day 5, the three treatments were fed on Brachionus at a density of 20 per ml until day 9, for treatments 1 and 3, and day 15 for treatment 2. In all rearing aquaria, Chlorella was added at a density of 1-3 X 105 cells per ml to serve as food for the rotifer and maintain good quality of water. Starting at day 10, Artemia nauplii were given to larvae of the first and third treatments initially at a density of 2 per ml in addition to Brachionus. The amount of Brachionus in the two treatments was gradually reduced to 10 per ml until it was completely removed on day 17. From this day to the end of the experimental trial, fish of the first treatment were fed on Artemia only, whose density was finally increased gradually to be 10 per ml. In treatment 3, Moina macrocopa were fed to the Clarias gariepinus larvae in combination with Artemia from day 18 to day 20 and later on, Moina was fed until day 35. In treatment 2, fish continued to feed on Brachionus and feeding of fish on Artemia was delayed until day 15. Artemia nauplii were fed in combination with Brachionus until day 20, after which only Artemia was given* Delaying feeding of Artemia nauplii until day 15 (in treatment 2) on resulted in slower larvae growth rates compared with fish fed Artemia starting on day 10. Partial replacement of Artemia nauplii by Moina macrocopa starting on day 17 showed a marked growth in larval growth over the delayed Anemia treatment- There was no significant difference in the survival percentage of al] treatments,}, keywords = {Clarias gariepinus,Larvae,feeding,primary nursing}, url = {https://ejabf.journals.ekb.eg/article_1705.html}, eprint = {https://ejabf.journals.ekb.eg/article_1705_1137c758eca84f910e5e978cd8caaa0f.pdf} } @article { author = {Abd El-Nasser, Gamal and Shokr, El-Saved and Abdcl-Hakim, Nabii}, title = {MANIPULATING THE SPAWNING TIME OF THE AFRICAN CATFISH {CLARIAS GARIEPINUS) USING TEMPERATURE .AND PHOTOPERIOD}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {11-28}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1706}, abstract = {The possibility of manipulating the spawning time of the African catfish (Clarias gariepinus) was tested so that its fry could be produced and available all the year round.A total number of 120 of Clarias gariepinus immature females with an average weight of 80.52 ± 4.58 g were randomly divided into 8 groups and accommodated in 8 glass aquaria & 170 x 70x 50 cm each, representing 3 treatments and control (two replicates each). The first two aquaria (control) were subjected to the natural light (10L: 14D) and room temperature (18 - 21 °C). The second two aquaria (treatment 1) were also kept under same photoperiod as the control, however water temperature was increased and maintained at (27 - 28 °C). The third two aquaria representing treatment 2 were subjected to a longer photoperiod (I5L; 9D) and their water temperature was kept as low as the control. Water temperature of the last two aquaria (treatment 3) was adjusted and maintained as high as that of treatment 2 (27 - 28 °C), however the photoperiod was similar to that of the second treatment (15L: 9D). Fish were fed 6 days a week at a rate of 2% of the total biomass using 25% protein pelleted diet. Feeding quantity was adjusted according to the total biomass weekly. Samples offish were taken regularly from the odd aquaria to follow growth rate and check for maturity. Five samples were taken during the experimental run. The first sample was taken after 16 days from the beginning of the experiment. The second one was after 30 days from the beginning of the experiment The third was carried out after 45 days The fourth and fifth were after 55 and 70 days from the start of the experiment, respectively. The fish samples were scarified and ovaries were extruded carefully and weighed to calculate the gonadosomatic index. Whenever fish of any treatment reach maturity stage and become fully ripe, fish of the other aquaria of the same  selected when they were ready to spawn and were artificially reproduced using injection with suspension of pituitaries of males from the same aquaria,After 30 days from the start of the experiment, treatment 1 (15L: 9D, & room temperature) reached the ripe stage earlier than the other ones, 40 days earlier than the control group. Thirteen females out of 15 with an average body weight of 95.4 ± 3.82g responded to the injection. After 45 days from the beginning of the experiment treatment 3 (15L:9 D & 27 - 28°C) followed Treatment 1. The spawning time of treatment 3 started 25 days earlier than the control. Twelve females with an average body weight of 96.0 ± 2.22 g were stripped successfully out of 15. After 55 days, treatment 2 (15L: 9 D & room temperature) was the third one to reach the ripe-egg stage 15 days earlier than the control Number of responding females was 11 with an average body weight of 97.1 ± 6.74 g. The last treatment that reached egg-ripening stage was the control after 70 days from the beginning of the experiment. Twelve females with an average body weight of 99.0 ± 5.26 g were injected and stripped. The mean values of egg/weight index percentage, fertilization percentage, hatching percentage and percentage of deformed larvae in the three treatments were not significantly different. Moreover, the spawning time of first group extended to overlap with that of the third one that extended in its turn to overlap with the spawning time of the second. The spawning time of the second treatment also extended to overlap with that of the control. Accordingly, there was an artificial spawning time (additional 40 days) that prolonged the natural spawning season and extended the availability ofClariasfry for, a longer period. Growth, gonadosomatic index, artificial spawning indices were also discussed.}, keywords = {Spawning,Clarias. gariepinus,Temperature,Photoperiod}, url = {https://ejabf.journals.ekb.eg/article_1706.html}, eprint = {https://ejabf.journals.ekb.eg/article_1706_577bdc59ac3ed32cb8def93086ebe75a.pdf} } @article { author = {Khallaf, Elsayed and Passia, D. and Abdccn, Ahmed and Mcsady, Feryal}, title = {THE EFFECT OF TEMPERATURE VARIATION ON THE SEX COMPOSITION AND GROWTH OF PEOCILIA MELANOGASTER OFFSPRING}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {29-43}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1707}, abstract = {The sexual differentiation of P. melanogaster embryos was examined among fish kept in glass aquaria (80x40x35 cm) at 23, 26and29°CwithapH=6.5.Analysis of variance of the data revealed a significant variation (at the 5 % level) of sex composition relative to increase of water temperature .Two mathematical representations were predicted for males and females.Accordingly, the degrees at which all males, or all females, or 1:1 sex ratio had been determined was 18.95, 32.01 and25.4°C respectively. The mechanism of this temperature effect on the sex ratio was discussed where growth offish was suspected to have played a role in this process.}, keywords = {Temperture,sex composition,Growth,offspring,Peocilia}, url = {https://ejabf.journals.ekb.eg/article_1707.html}, eprint = {https://ejabf.journals.ekb.eg/article_1707_28ed629b260b56183f97ce3c0b5597cb.pdf} } @article { author = {Ayyat, Mohamcd and Hafez, Fatma and Mahxnoud, Ahmed and Abbas, Fayza}, title = {EFFECT OF STOCKING RATIO AND CHEMICAL FERTILIZATION ON POND WATER QUALITY AND GROWTH PERFORMANCE OF SOME WARM WATER FISH SPECIES}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {45-59}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1708}, abstract = {This experiment was carried out in the Central Laboratory for Aquaculture Research from June to October 1997. A total number of 11400 fingerlings were used in this work. Such number included 7200 Nile tilapia, 3600 common carp and 600 grass carp. The fish were divided into six experimental groups. Polyculture system was carried out in the present experiment. Six earthen ponds (20X50m, 1000m2) were used in this study. Three ponds were fertilized with inorganic fertilization, while the other three ponds were left without inorganic fertilization. At the start of the experiment, each pond was fertilized with 50 kg chicken manure weekly per pond. The chemical composition of chicken manure was 18.5% crude protein, 12.2% crude fiber, 1.5% ether extract and 32.1% ash. The experimental diet was given at a rate of 3% of body weight per day. The ration was contained 15.9% crude protein, 10.6% crude fiber, 4.9% ether extract and 8.6% ash. The first three ponds were weekly fertilized with 2.5 kg urea (46% N) and 5 Kg superphosphate (15.5 CP) as the chemical fertilizer per pond, while the other three ponds didn't receive any chemical fertilizer. Fish samples were taken randomly biweekly from each pond.Within each fertilization system and feeding system, the first pond was stocked with 900 Nile tilapia, 900 common carp and 200 grass carp (45, 45 and 10% stocking ratio, respectively; 1:1 tilapia : common carp). The second pond was stocked with 1200 Tilapia, 600 common carp and 200 grass carp (60, 30 and 10%-stocking ratio, respectively; 2:1 tilapia to common carp). The third pond was stocked with 1500 tilapia, 300 common carp and 200 grass carp (75. 15 and ] 0% stocking ratio, respectively; 5:1 tilapia to common carp. Water quality of the ponds was measured daily. The obtained results can be summarized as follows:■ Phytoplankton and zooplankton increased as affected with chemical fertilization. Stocking ratio I tilapia: 1 common carp recorded higher phytoplankton and zooplankton, while the ratio 5 tilapia: 1 common carp recorded lower phytoplankton and zooplankton in each fertilized and non-fertilized pond. Water temperature was not affected with fertilizers or stocking ratio. Concentration of dissolved oxygen in water ponds increased with chemical fertilizer under all stocking ratios. Values of pH, total hardness, total nitrogen and total phosphorus concentration increased with chemical fertilization than those without chemical fertilizers. On the other hand, increasing tilapia density decreased total nitrogen concentration-Fish body weight increased significantly (P<0.05) in chemical fertilization treatments during the whole experiment. Nile tilapia showed the highest responses to chemical fertilization. Fish live body weight, body length or condition factor were not affected significantly with stocking ratio.}, keywords = {Nile tilapia,Common Carp,Grass carp,polyculture,stocking rtio,fertilizer}, url = {https://ejabf.journals.ekb.eg/article_1708.html}, eprint = {https://ejabf.journals.ekb.eg/article_1708_750e2bb65ec9c168864622a01754f599.pdf} } @article { author = {Abdel - Hakim, Nabit , and N. Bakccr, Mohammed and Soltan, Magdy}, title = {EFFECT OF DIETARY PROTEIN LEVELS ON GROWTH PERFORMANCE AND POND PRODUCTIVITY OF NILE TILAPIA {OREOCHROMIS NILOTICUS) > EEL {ANGUILLA ANGUILL4) AND GREY MULLET (MUGIL CEPHALUS) REARED IN POLYCULTURE SYSTEM}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {61-85}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1709}, abstract = {HPhis study was carried out in a fish farm at Fowwa; Kafr-El Sheik A Governorate, A.R.E. The study aimed to investigate the growth performance of eel; grey mullet and Nile tilapia fishes reared in earthen ponds as well as pond productivity as affected with dietary protein levels. Nine earthen ponds each of total area of 2000m2 represented three dietary protein levels (20; 32 and 44%) with three replicates for each protein level. Fish species were stocked in each pond at densities of 2000; 1000 and 800 with an average initial weight of 20; 29 and 31 g for tilapia; mullet and eels; respectively. The study started in 15. 4. 2000 and lasted in 15. 12. 2000. Results obtained arc summarized in the following: 1- Final body weights of Nile tilapia increased significantly with each increase in the dietary protein level from 20 to 32 or 44%. 2- Final body weights of eels increased significantly with each increase in the protein level fed, however for mullet final weights of fish fed on 32 or 44% protein level were significantly superior than those fed on the lower protein level. 3-Final body length of both Nile tilapia and eels increased significantly with each increase in the protein level fed, while in mullet final body length of groups fed the 32 or 44%protein level were significantly higher than that of the 20%protein level. 4- Specific growth rate during the whole experimental'period improved significantly in tilapia and eel as the level of protein increased from 20 to 32 or 44%, however the specific growth rates of mullets fed the 32 or 44% dietary protein were significantly higher than those fed the 20% protein diet. 5- Protein levels fed seemed to have no significant effects on dressing percentages of tilapia, while it released significant effects on this trait in eels and mullet. 6- Protein levels fed had significant effects on the proximate analysis of whole bodies of tilapia; eel and mullet. Based on results obtained in this study and on the economical evaluation it could be concluded that tilapia; mullet and eel can be cultured together in earthen ponds and growth parameters of the three species improved with each increase in the protein level fed from 20 to 32 and 44%, however from the economical point of view a diet containing 32% protein seemed to be the best in terms of ratio of returns to total costs.}, keywords = {Dietary protein levels, Nile tilapia, eel,mullet, earthen pond, polyculture}, url = {https://ejabf.journals.ekb.eg/article_1709.html}, eprint = {https://ejabf.journals.ekb.eg/article_1709_a3ce03b6501027bf72d98c466c507f11.pdf} } @article { author = {Shalaby, Shvmaa and El-Dakar, Ashraf and Ghoncim, Samir}, title = {PROTEIN - SPARING EFFECT BY CARBOHYDRATE IN DIETS OF RABBITFISH, SIGANUS RIVULA TVS}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {87-98}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1710}, abstract = {Afeeding trail was carried out to study the effect of varying ratios of dietary carbohydrate to protein (CHO/CP) on growth, feed conversion, protein and energy efficiency utilization, body composition and cost-benefit analysis of marine rabbitfish, Siganus rivulatus, fingerlings. Ten net cages, each holding 0.5 m3 with dimensions of lx Ix 0.5 m were used to stock 10 fingerlings with an average of 1.1 g/fish initial weight. Two sub-optimum protein levels (35 and 25 % CP), each having two varying CHO/CP ratios (0.6; 0.9 and 1.6; 1.9, respectively), were compared with diet containing 44% CP that recorded as optimum level for S. rivulatus species by Shalaby (1998). Corn starch and a-cellulose were used instead offish meal in the isocaloric experimental diets. Fish were fed the experimental diets at rate of 6% of biomass daily, six days a week for 84 days. Fish were weighed every two week intervals and feed amounts were adjusted on the basis of the new fish weight.Results revealed that no significant differences (PO.05) were observed in growth and feed conversion between varying CHO/CP ratios. Although protein sparing effect occurred at two sub-optimum (35 and 25% CP) protein levels, the maximum sparing of protein was found when fish were fed 1.9 CHO/CP ratio in diet containing lower protein (26% CP) and higher carbohydrate (50.13% CHO) levels based on feed conversion and protein efficiency ratio. PER and PPV% improved as CHO/CP ratio increased. Higher PER values were obtained with diet of 1.9 CHO/CP ratio. Results show that a ratio between 0.6-0.9 CHO/CP in diets containing 35% could be recommended to spare about 7-8% protein by carbohydrate. However, 22% carbohydrate could spare about 18% protein when 5. rivulatus fed low dietary protein levels. In addition, cost-benefit analysis indicated that protein-sparing effect of 1.9 CHO/CP ratio at low protein level was economically superior to 0.6-1.6 CHO/CP ratios.}, keywords = {rabbitfish,Siganus rivulatus. protein sparing,carbohydrate}, url = {https://ejabf.journals.ekb.eg/article_1710.html}, eprint = {https://ejabf.journals.ekb.eg/article_1710_719a85441d3b8947150ff18c0e76ed80.pdf} } @article { author = {Gabr, Howaida}, title = {FECUNDITY OF CUTTLEFISH {SEPIA OFFICINALIS) DETERMINED FROM LABORATORY EGG LAYING: IMPLICATIONS FOR FISHERIES MANAGEMENT}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {99-116}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1711}, abstract = {Current method of estimating fecundity of Sepia qfficinalis is based on the number of laid eggs as actually observed . Data account of prolonged spawning in S> qfficinalis of this study were primarily based on observation of different-sized females reared from hatching. At the end of the experiment, the animals were dissected to check the maturation stage of the gonads and the presence of ova and tlieir developmental stage. The effective and potential fecundity were estimated. Fecundity of 5. qfficmalis was over most of the suggested fecundity for wild females, yet over the suggsted fecundity for captive animals. Potential fecundity estimates ranged from 5000 to 6000 at 140 mm mantle length and 1000 to 2000 at 120 mm ML. Batch size ranged from 5 to 46 batches. Spawning lasted from 25 to 165 days and the average time elapsed between batches was 1.6 to 7.35 days. The number ofoocytes destined to be matured in a season is decided prior to spawning and can be identified and counted before release of the first egg batch. An accurate estimate of these eggs should be at the beginning and end of the spawning, and their difference is considered to be the actual fecundity. All eggs < 2.0 mm diameter were considered potentially capable of being spawned. An attempt at improving scientific fishery management policy is made. The considerable benefits accruing from the laboratory behavior observations are described. These benefits would contribute towards the projecting future developments in commercial cuttlefish aquaculture particularly its breeding stage.}, keywords = {Cephalopods,S. qfficinalis,actual and potential fecundity}, url = {https://ejabf.journals.ekb.eg/article_1711.html}, eprint = {https://ejabf.journals.ekb.eg/article_1711_a6655cd758a0b46ac835bd10529fd82e.pdf} } @article { author = {Mostafa, Osama and El-Dafrawy, Shadia and Bakry, Fayez}, title = {DETERMINATION OF THE COMPATIBILITY BETWEEN BIOMPHALARIA ALEXANDRINA AND ECHINOSTOMA LIEI USING SDS-PAGE ANALYSIS OF TISSUE SOLUBLE PROTEINS}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {117-129}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1712}, abstract = {SDS-PAGE analysis of tissue soluble proteins of Biomphalaria alexandrina and rediae, cercariae, metacercariae and adult worms of Echmostoma liei was done for determination of the degree of compatibility between the snail and each of intramolluscan larval stages and adult worms of the parasite. The highest degree of similarity was observed between B. alexandrina and metacercanae of E. liei. However, the lowest degree of similarity was noted between B. alexandrina and adult worms of E. lieu On the other hand, the similarity coefficient between B. alexandrina and E. liei rediae was higher than that between the snail and E. liei cercariae.}, keywords = {Compatibility,Biomphalaria,Echmostoma,SDA-PAGE,tissue proteins}, url = {https://ejabf.journals.ekb.eg/article_1712.html}, eprint = {https://ejabf.journals.ekb.eg/article_1712_29e8012dfe6ef27a1037c80b11446ce6.pdf} } @article { author = {Sharaf El-Din, Ahmed and Bakrv, Favez and Tantawv, Ahmed}, title = {M0LLUSC1CIDAL ACTIVITY OF ZYGOPHYLLUMSIMPLEX (FAMILY: ZYGOPHYLLACEAE) AGAINST BJOMPHALARIA ALEXANDRINA AND BULINUS TRUNCATUS}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {131-143}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1713}, abstract = {The molluscicidal activity of Zygophyllum simplex plant leaves powder on Biomphalaria alexandrina and Bulinus truncatus snails after 24 hours of exposure was evaluated under laboratory conditions. The results obtained indicated that the LC$o values for this plant were 42 ppm and 38 ppm and LC90 values were 65 ppm and 60 ppm for B. alexandrina and B. truncatus respectively. The sublethal concentrations (LCo, LCio and LC25) were 4.2, 27 and 34 ppm for Z?. alexandrina and 3.8, 25 and 32 ppm, for B. truncatus. Continuous maintaining of snails in sublethal concentrations (LCo, LCto and LC25) of Z simplex led to an increase in mortality rate of the snails which was significantly higher than that of the control group. The effect of the tested sublethal concentrations of Z simplex on infection of B, alexandrina with 5. mansoni miracidia was studied. The infection rate was significantly lower than that of control snails with reduction rates of 23.5%, 35.1% and 66.9% for snails exposed to LCo, LCjo and LCis, respectively. Prepatent period of exposed snails to LCo, LC10 and LC25 of Zygophyllum was prolonged to be 30.2 ± 2.4, 32.4 + 2.1 and 34.6 ±3.1 days compared to 28.6 ±3.6 days for the control group. Meanwhile, the duration of cercarial shedding was significantly shortened, being 22.8 ± 4.4, 18.3 ±4.9 and 10.5 ± 3.8 days for LCof LQo and LC25 respectively, compared with 44.2 ±4.8 days for the control snails. Highly significant reductions of total cercarial production per snails and per stimulant were also detected in experimental snails in comparison with the control group.}, keywords = {molluscicides,Zygophyllum,Biomphalaria alexandrina,Bulinus truncatus}, url = {https://ejabf.journals.ekb.eg/article_1713.html}, eprint = {https://ejabf.journals.ekb.eg/article_1713_74eaca374448e0ff2151ef8814c3243d.pdf} } @article { author = {Al-Khayat, Jassim and Ibrahim, Ibrahim i}, title = {FOULING IN THE PEARL OYSTER BEDS OF THE QATARI WATERS, ARABIAN GULF}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {145-163}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1714}, abstract = {Foulmg organisms at twelve different pearl oyster beds in the Qatari waters of the Arabian Gulf have been examined and their degree of abundance was assessed. The majority of fouling organisms were algae, sponges, bryozoans* polychaetes, crustaceans, gastropods, bivalves, amphineurans, stelleroida, actinozoans, hydrozoans and ascidians. The list of fouling species identified included a total of 111 species. The highest number recorded of fouling species was at Akraiyash site with the highest diversity index, while the least number was reported in Um Al-Cheteb with the lowest diversity index.}, keywords = {Macrofouling,Pearl oyster,Community structure,Arabian Gulf. Qatar}, url = {https://ejabf.journals.ekb.eg/article_1714.html}, eprint = {https://ejabf.journals.ekb.eg/article_1714_1a9baff936d52992ef30fb0ccd9e3097.pdf} } @article { author = {Kotb, Mohammed}, title = {GROWTH RATES OF THREE REEF-BUILDING CORAL SPECIES IN THE NORTHERN RED SEA, EGYPT}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {165-185}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1715}, abstract = {Growth rates as linear extensions were measured for three species of reef-building corals in four different seasons and at three different depths (5m, 15m, and 30m) in Na'ama Bay, south of Sinai, northern Red Sea, Egypt. Alizarine-Red-S-stain was used as skeletal marker to stain the colonies alive in-situ. Comparison with similar studies elsewhere in the tropical regions shows consistency in growth patterns of the studied species regardless of depth and season, while they were different than others. The estimated annual rates of linear growth for the three corals considered at the different depths (5m, 15m, and 30m) were 9,24, 7.48, and 6.51mm/y for S. pistillata; 6.34, 9.24, and 5.90mm/y for A. granulosa; and 7.40 and 6.6mm/y for P. damicornis, respectively; P. damicornis was not found at 30m depth. Analysis of the data shows that it is not simple to detect the effect of either temperature or light level on the coral growth and they are simultaneously controlling the coral growth beside other factors, which could interfere as well. The present work could serve as a database for the future environmental monitoring of the marine life in Na'ama Bay, which is one of the tourist destinations in the Egyptian Gulf of Aqaba Protectorates.}, keywords = {Linear growth,Coral reefs,Red Sea,Egypt}, url = {https://ejabf.journals.ekb.eg/article_1715.html}, eprint = {https://ejabf.journals.ekb.eg/article_1715_695abd3ab0a776c3063bb60e2d54f4a9.pdf} } @article { author = {Abdcl-Aziz, Nagwa and Dorgham, Mohamcd}, title = {ROTIFERS AS INDICATORS OF LAND-BASED EFFLUENTS IN THE MEDITERRANEAN COASTAL WATERS OF EGYPT.}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {187-203}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1716}, abstract = {The species composition, abundance, and distribution of rotifers were sudied in several parts along the Egyptian Mediterranean coast, particularly those exposed to variable sorts of discharged inland waters. These areas include from east to west the swash zone between El-Maadiya City and Rosetta mouth of the River Nile, BoughazEl-Maadiya, Abu Qir Bay, and both Western and Dekhaila Harbours of Alexandria.The results were discussed in relation to water circulation patterns in the areas of study. Significant regional variations were recorded in the species composition and density of the rotifer community, as well as their role in the total zooplankton. The distribution of rotifer species appeared to be tightly related to the variability in volume and dispersion of the discharged waters. Several species of fresh and low brackish water origins were found at high salinity (up to 39.2%°), referring them as hydrological or ecological indicators.Each of the studied areas was characterized by its own dominant species, but some of these species were observed as dominant in the whole region. Rotifers in the study region were most productive during the warm period from late spring to early autumn.}, keywords = {Rotifers,hydrological indicators,land-based effluents,coastal waters}, url = {https://ejabf.journals.ekb.eg/article_1716.html}, eprint = {https://ejabf.journals.ekb.eg/article_1716_3feb7a4e823a79a965fa5b64b552281a.pdf} } @article { author = {Khallaf, Elsayed and Hassab EInabi, Sobhy and Zaki, Zaki and Badr, Osama}, title = {THE PROTECTIVE EFFECT OF ASCORBIC ACID ON THE HISTOLOGICAL CHANGES CAUSED BY THE HERBICIDE (RONSTAR) IN NILOTIC CATFISH : CLARIAS LAZERA ( C GARIEPINUS)}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {205-217}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1717}, abstract = {Ronstar was applied at concentrations of 2.0,5.75 and 9.5 mg/L. Histological alterations were determined in liver and kidney of the catfish Clarias lazera.The histological changes in liver of catfish C lazera intoxicated with different doses of Ronstar, included dilation of the blood veins and sinusoids, vacuolation in the cytoplasm and pyknosis in the nuclei of the hepatocytes, haemorrhage is also noticed in the veins and sinusoids.The phagocytic Kupffer and endothelial cells are also abundant as an immunoresponse reaction. The vacuolation is the most frequent histological alteration observed at all tested doses of Ronstar.Ascorbic acid (lOmg/lkg of body *weight)was reported to reduce some of the histological damage occurred in the liver tissue. It alleviated the rate ofpyknosisand vacuolationThe rate of ascorbic acid healing effect depends on the Ronstar tested dose.Ronstar induced different histological alterations in the kidney of the catfish C lazera The glomeruli became expanded and their capillaries were extended, the subcapsular space enlarged or disappeared. The haemopoietic tissue exhibited some vaculation and the renal tubules were swollen or degenerated. Some of them took an irregular shape .The expanded glomeruli with extended capillaries  were the most frequent histological alteration observed in the different doses of Ronstar .Ascorbic acid induced some amelioration in the histological structure of kidney at all tested doses of Ronstar. It decreased the rate of glomerular expansion or caused a restoration to its normal shape, rate of the extending of the glomerular capillaries was also decreased.The subcapsular space restored its normal appearance. The rate of vacuolation was alleviated in the haemopoietic tissue, while some of the renal tubules tend to be normal.At higher doses of the Ronstar, the healing effect of ascorbic acid became less potent.}, keywords = {Herbicide Ronstar,Claria lazera,histologicl changes,Liver,kidney,ascorbic acid}, url = {https://ejabf.journals.ekb.eg/article_1717.html}, eprint = {https://ejabf.journals.ekb.eg/article_1717_944c6cc18635623a223a57a38d6f28d7.pdf} } @article { author = {ML Shoman, Hoda}, title = {ULTRASTRUCTURAL CHANGES ASSOCIATED WITH MOLLUSCICIDE HEPATOTOXICITY IN FISHES}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {219-236}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1718}, abstract = {Adult sexually mature male specimens of the mosquito fish, Gambusia ajfinis (Baird & Giard) were exposed to a low concentration (0.2 mg/1) of the molluscicide Bayluscide for 15 days. Semithin and ultra-thin sections of the liver, of both control and treated specimens, were examined by light and electron microscopes. The livers of the control fish showed that the typical hepatocyte has hexagonal shape and a large single euchromatic nucleus. Its cytoplasm contains rough endoplasmic reticulum, which is concentrated mainly around the nucleus and subjacent to the cell membrane. Many round, oval or rod-shaped mitochondria, a considerable amount of glycogen granules, in addition to rounded prominent fat globules are observed in the hepatocyte cytoplasm. The blood sinusoids are lined by endothelial cells, whereas numerous microvilli extend from hepatocytes into the sub-endothelial space (space of Disse). The bile canaliculi are formed at the junction of the hepatocytes.Liver cells of treated fish showed detectable changes from that of controls. The changes include reduction of rough endoplasmic reticulum (RER) and glycogen granules, as well as mitochondrial degeneration. The primary and secondary lysosomcs increased in number and became variable in size and shape. The hepatocytes also showed vacuoles of variable sizes and shapes and prominent leached fat globules. In addition to the previous changes, the severely affected cells showed evidence of nucleus and cell membrane degeneration with large cytoplasmic vacuoles communicating with each other.}, keywords = {Mosquito fishr Gambusia qffinis,Bayluscide,Ultrastructure,Liver}, url = {https://ejabf.journals.ekb.eg/article_1718.html}, eprint = {https://ejabf.journals.ekb.eg/article_1718_309d5ea69fbd18bcf498e327edda78eb.pdf} } @article { author = {Konsowa, Adel}, title = {IMPACT OF TRACE METALS ON THE DISTRIBUTION OF PHYTOPLANKTON AND THEIR CONTENT IN OREOCHROMIS NILOTJCUS AT ROSETTA BRANCH}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {237-249}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1719}, abstract = {The data indicated that El-Rahawy, Sobel, Kafr El-Ziat and Edfina sectors represent the highly polluted area along Rosetta Stream. Phytoplankton crops recorded downstream the discharging point of El-Rahawy and Kafr El-Ziat Drains were higher than the corresponding values occurred at the upstream areas. At Edfina sector, the numerical density of phytoplankton was high upstream the barrage compared to its downstream sector (Estuarinc) and this phenomenon can be related to the negative impact of high salinity. Bacillariophyceae occupied the first predominant position followed by Chlorophyceae and Cyanophyceae. Diatoms, Green and Blue-green algae constituted about 99% of the total phytoplankton crop. Trace metal contents of Rosetta Branch can be arranged in descending order as follows: Fe > Mn > Ni > Pb > Co > Zn > Cd > Cu > Hg. The levels of Fe, Mn and Ni in Oreochromis mloticus flesh collected from El-Rahawy, Sobel, Kafir el-Ziat and Edfina were high compared to the samples caught from El-Kanater Sector.}, keywords = {trace metals,phytoplankton,Orcachromis,Rosetta Branch}, url = {https://ejabf.journals.ekb.eg/article_1719.html}, eprint = {https://ejabf.journals.ekb.eg/article_1719_49cc99974b79d647b45bb1d13136a6f0.pdf} } @article { author = {Elghobashy, Hussein and Zaghloul, Khalid and Metwally, Mahmoud}, title = {EFFECT OF SOME WATER POLLUTANTS ON THE NILE TILAPIA, OREOCHROMISNILOTICUS COLLECTED FROM THE RIVER NILE AND SOME EGYPTIAN LAKES}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {251-279}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1720}, abstract = {Pollution of surface water has increased due to the industrial effluents, waste municipal and agricultural drainage water that discharge directly into it. The present study measured the concentrations of some heavy metals (Fe, Cu, Zn> Pb and Cd) in water, sediment and Nile tilapia fish collected from certain Egyptian lakes (Maryut, Manzala, El-Burullus, Edku and Qarun), a polluted site of the River Nile (Shubra El-Khiema, Cairo sector), in addition to Ismalia canal (El-Abbassa region).The results revealed that fish collected from the polluted site of the River Nile and the studied lakes (Maryut, Manzala, El-Burullus and Edku) showed the lowest growth factor, hepalosomatic index, meat quality and disturbances in the studied physiological state as indicated by the increase in serum glucose, total protein, AST, ALT, alkaline phosphstase, creatinine, uric acid and a decrease in serum total lipids. In comparison, fish collected from lake Qarun exhibited higher levels of meat quality and growth indices than those collected from the other studied sites and showed normal levels in the different examined biochemical parameters as those of the control group collected from Ismalia canal.Chemical analyses of water samples suggested that high salinity, total alkalinity and total hardness in lake Qarun might have inhibited the bioaccumulation of any of the studied heavy metals (Fe*4, Cu**, Zn**, Pb** and Cd**) in the different studied organs of Oreochromis niloticus to be within permissible levels as those of fish collected from Ismailyia canal (Abbassa region). However, fish collected from the other studied lakes and the polluted site of the River Nile accumulated spatially the heavy metals in the different studied fish organs.}, keywords = {Water pollutants,Nile tilapia,River Nile,Egyption lakes}, url = {https://ejabf.journals.ekb.eg/article_1720.html}, eprint = {https://ejabf.journals.ekb.eg/article_1720_05cdd1b1c648e000ee4caeb7d50b1e4c.pdf} } @article { author = {Aiwvad, Mohammed and Morsy, Gazaa}, title = {SMALL-SUBUNIT RIBOSOMAL RNA GENE IDENTIFICATION OF THE HUMAN PATHOGEN SCHISTOSOMA SP. IN EGYPT}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {281-294}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1721}, abstract = {The polymerase chain reaction and restriction fragment length polymorphism (RFLP) of the 18S rRNA gene, utilizing the enzyme BspMI, were used for the molecular identification of the two species of Schistosoma (haematobium and mansoni). The RFLP profiles extracted using this enzyme were highly characteristic of the two species and exhibited low levels of intraspecific polymorphism among samples from different regions of Egypt. However, 5. haematobium and S. mansoni showed very simitar profiles that complicated their identification at the molecular level and promised a very close genetic similarity between the two species. Other enzymes including AccI, Avail and SnaBI were tested for their ability to differentiate between these species. The study pointed out that the 18S rRNA gene contains effective genetic markers for the identification of these Schistosoma spp..}, keywords = {identification,Schistosoma,nsrDNA,rRNA gene}, url = {https://ejabf.journals.ekb.eg/article_1721.html}, eprint = {https://ejabf.journals.ekb.eg/article_1721_eae55f6cb0dc33f119eb0a6899b2dc86.pdf} } @article { author = {El-Nady, Mohamcd and Kamar, Mohamcd and Hafez, Fatma and Abu-Scif, Ramadan}, title = {EFFECT OF DIFFERENT HUSBANDRY METHODS ON FRESHWATER FISHES}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {295-318}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1722}, abstract = {This study was conducted jointly at the Central Laboratory for Aquaculture Research (CLAR) and Faculty of Agriculture, Cairo University. The experiment included six treatments. The first treatment included the application of supplemental diet (17% CP), The second treatment included the application of complete diet (25% CP). Both diets were administrated at a rate of 3% of fish body weight per day. The third treatment included a biweekly application of nitrate and triple super phosphate(ammonium nitrate 33% N and TSP 37% P205) at high dose at a rate of 10.61 and 4.72 kg/pond, respectively. The fourth treatment included a biweekly application at a medium dose at a rate of 53 and 2.36 kg/pond. The fifth treatment included a biweekly application at a low dose at rate of 2.65 and 1.18 kg/pond. The sixth treatment was considered as a control treatment with no addition of nutritional or fertilizer inputs.Water temperature in the experimental ponds was below the thermal requirements offish for optimal growth during winter season and of medium magnitude during fall and spring and close to the optimal thermal range for growth during summer season.Water in experimental ponds was characterized by high alkalinity (263.11 - 490.0 mg/1), high hardness (180.79 -339.16 mg/1) and high pH values (8.58-9.8) among treatments during the course of the experiment.}, keywords = {fish,tilapia,Common Carp,Silver carp,water quality,growth chemical fertilizer}, url = {https://ejabf.journals.ekb.eg/article_1722.html}, eprint = {https://ejabf.journals.ekb.eg/article_1722_a596e5bfbf95a4415cf3f89da17496ae.pdf} } @article { author = {}, title = {EFFECT OF METHIDATHION ON THE CYTOCHROME P-450 ENZYMES IN THE NILE TILAPIA OREOCHROMIS NILOTICVS}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {4}, pages = {319-329}, year = {2001}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2001.1723}, abstract = {An experiment was conduced on adult male and female Nile tilapia to investigate the effect of Methidathion (MD,is one of the more toxic organophosphates) MD at doses 3 \xg l"1 '10 jig l"1,20 jag r'on the microsomal of ethoxy-resrufin o-deethylase activity (EROD). The experimental fish was obtained from Manzala Lake from the areas suffering from pollution. Result revealed that activity of EROD in female livers jig/kg/ fresh liver was (3,33,25,17,12) for MD concentrations 3|igl_i; 1 Opgl"1 ;20jigl*!, Control and IC groups, respectively. Analysis of variance indicated that differences among the tested groups were not significant P