@article { author = {Abdel-Monem, Ahmed and Kanswa, Adel}, title = {SOME BIOTIC AND ABIOTIC VARIABLES CONTROLLING PRIMARY PRODUCTIVITY IN HYPERTROPHIC LAKE (LAKE QARUN-EGYPT)}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {1-16}, 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.2001.1686}, abstract = {  Primary productivity was measured monthly in Lake Qarun during 1993 using C technique and the annual average value was 105.5 mg Cm" h" . The study revealed that both biotic and abiotic variables have affected the primary productivity. Phytoplankton biomass, as biotic factor, was represented by total Chlorophyll a (annual average of 26 mg m"3). Chlorophyll a was fractionated into two major groups based on their availability to herbivorous zooplankton; nanoplankton (<20p.) or edible algae and netplankton (> 20fi) or inedible algae. Nanoplankton was dominated and represented by about 69,4% of total phytoplankton, while netplankton was about 30.6%. Size fraction ratio was controlled by their relative size-specific growth rates not by herbivorous zooplankton. There was a linear relationship between the relative contribution of nanoplankton and total algal biomass (r=0.96, p>95). Primary productivity has been affected by nanoplankton more than any other biotic variable.Abiotic parameters (physical and chemical) were also studied and discussed in relation to its effect on primary productivity. The statistical analysis cleared that water temperature and NO3-N were the main factors regulating primary productivity among all ecological parameters tested.}, keywords = {missed}, url = {https://ejabf.journals.ekb.eg/article_1686.html}, eprint = {https://ejabf.journals.ekb.eg/article_1686_6e8d4584426a8d8a3920e7b4a6b8f498.pdf} } @article { author = {Abdel - Satar, Amaal}, title = {ENVIRONMENTAL STUDIES ON THE IMPACT OF THE DRAINS EFFLUENT UPON THE SOUTHERN SECTOR OF LAKE MANZALAH, EGYPT}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {17-30}, 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.2001.1687}, abstract = {W, ffect of the drains effluent on the variations of trace metals and inorganic anions and cations of water were studied in the southern sector of Lake Manzalah during four successive seasons (1999-2000). The study revealed that an obvious depletion of dissolved oxygen has occurred in addition to a high increase in COD and BOD in the area which received the urban and agricultural wastes from Bahr El-Bagar drain. The concentrations of the nutrient salts showed a wide fluctuation and abrupt changes due to irregular influx of different wastes. Also, high and abnormal concentrations of ammonia, nitrate and orthophosphate were recorded. The levels of trace metals in lake water were high in areas received domestic and agricultural effluents.}, keywords = {missed}, url = {https://ejabf.journals.ekb.eg/article_1687.html}, eprint = {https://ejabf.journals.ekb.eg/article_1687_421e348dfd65aac20b2641ca315cf8c1.pdf} } @article { author = {Mehanna, Saha}, title = {GROWTH, MORTALITY AND YIELD PER RECRUIT OF RHABDOSARGUS HAFFARA (SPARIDAE) FROM THE SUEZ BAY}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {31-46}, 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.2001.1688}, abstract = {An estimate of the age and growth of Rhabdosargus hqffara collected from the Suez Bay is made by examining the growth increment of their scales. The growth rings showed that R. hqffara rarely attain more than four years. The Bertalanffy growth parameters were estimated as K= 0.47 , L^ = 26.79cm and to = -0.36 . The mean total mortality coefficient HZM estimated by two different methods was found to be 1.19 .Natural mortality coefficient "M" was estimated to be 0.29. Exploitation rate "E" was computed as 0.76. The yield per recruit was estimated using the model of Beverton and Holt (1957). The results indicatid that the stock of R~ haffara in the Suez Bay was overexploited and the fishing mortality coefficient must be reduced by about 40 % to obtain the maximum yield per recruit.}, keywords = {missed}, url = {https://ejabf.journals.ekb.eg/article_1688.html}, eprint = {https://ejabf.journals.ekb.eg/article_1688_ecbf86502878f882fc40924518b56d09.pdf} } @article { author = {Mohammed, Ragab}, title = {GROWTH AND PRODUCTION OF CLARIAS GARIEPINUS REARED IN CONCRETE PONDS AT DIFFERENT SIZES AND STOCKING RATES}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {47-60}, 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.2001.1689}, abstract = {Clarias gariepinus as one of the main freshwater fishes was reared in concrete ponds at three initial sizes and three stocking rates. In the first experiment, three concrete ponds were stocked with the same initial fish size of about 189 g at three stocking densities of 5, 8 and 10 fish/m , while in the second experiment, three size groups ranging from 90 to 120 g, from 170 to 200 g and larger than 200 g of Clarias gariepinus were reared in three ponds (one pond for each size) at stocking rate of 5 fish/m for 95 days. Ponds were supplied with underground water which was partially drained every day. Fishes were fed with supplementary feed containing 32% protein at 3% of body weight 6 times a week. Results showed that C. gariepinus weight increased from about 189g to 427.3, 352.4 and 295.03g in ponds stocked with 5, 8 and 10 fish/m respectively. Present results showed also that weight gain (g), average daily gain (g/fish/day) and the specific growth rate decreased with increasing stocking density. Gain in body weight and the average daily gain of C. gariepinus increased with increasing initial weight, while specific growth rate decreased with the increase in initial body weight. Economically, results indicated that C gariepinus weighed 170 to 200g at stocking rate of 5 fish/in3 could be considered as the best size and stocking rate for rearing them intensively in concrete ponds.}, keywords = {missede}, url = {https://ejabf.journals.ekb.eg/article_1689.html}, eprint = {https://ejabf.journals.ekb.eg/article_1689_846e2dba3ed19361eac2fb8cd857b967.pdf} } @article { author = {Abu S mak, Ola}, title = {ON THE COPULATORY ORGAN MUSCULATURE OF THE MONOGENEAN GILL PARASITE CALCEOSTOMA POLYORCHIS (VALA-AND EUZET, 1977) ABU SAMAK, 200 1}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {61-68}, 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.2001.1690}, abstract = {T he muscular system associated with the copulatory organ of the monogenean gill parasite, Calceostoma polyorchis consists of three groups of muscle fibers. The first group forms a sleeve around the longitudinal axis of the copulatory organ that help protrudes the copulatory tube from the male genital opening during copulation. The second group is short, attaches with the base of the copulatory organ and acts in the withdrawal of the copulatory tube inside the body ofthe parasite after copulation. The third group connects the terminal ends of both the sclerotized piece and the copulatory tube. It help inserts the anterior region of the copulatory tube inside the vaginal opening and maintains this position during copulation.}, keywords = {musculature,Copulatory organ,Monogenea,Calceostoma polyorchis}, url = {https://ejabf.journals.ekb.eg/article_1690.html}, eprint = {https://ejabf.journals.ekb.eg/article_1690_3239d5d72977d9c90325d06da2cced39.pdf} } @article { author = {Al -Amoudi, Mohamed and El-Ghobashy2, Ahamed}, title = {THE USE OF LOCAL PALM KERNEL MEAL (LPKM) AS APROTEIN SOURCE IN DIETS OF TILAPIA (OREOCHROMIS SP/LURUS GJ CULTURED IN RED SEA WATER}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {69-82}, 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.2001.1691}, abstract = {In Saudi Arabia, local Palm Kernel Meal (LPKM) was tested as a partial or a total replacement offish meal in the different diets of the studied fish. The experiment was carried out on tilapia (Oreochromis spllurm) reared in fiber glass tank filled with water pumped from the Red Sea. Six diets were formulated, diet I without LPKM and its contents of protein was 35%, Diets, (11,111,1V and V) contained an increasing levels of LPKM which corresponded to 30%, 25%, 20% and 15% of proteins respectively* Diet VI consisted only of LPKM without the addition of any other ingredients and contained 5.83% protein.The lowest increase in weight was observed with fish fed on diet VI, while the highest increase was observed with diet I. The best food conversion rate (FCR) was noticed with fish fed on diet I (1.73). while the worst FCR (4.4) was with diet VI.Ash, dry materials, water, protein and fat contents in 0. spilurm carcass muscles, showed no differences among experimental diets I to V. On the contrary, fat and protein contents were significantly lower in muscles of fish fed on diet VI, and their moisture and ash contents were relatively high compared to other diets tested.}, keywords = {missed}, url = {https://ejabf.journals.ekb.eg/article_1691.html}, eprint = {https://ejabf.journals.ekb.eg/article_1691_6ed318f8db11b160a032a6d6cd589193.pdf} } @article { author = {Hassanine, Reda}, title = {DKJENEAN TREMATODES OF MARINE TELEOST FISHES : THE GENUS HELICOMETRA ODHNER, 1902 (OPECOELIDAE) :ON THE VALIDITY OF TWO KNOWN SPECIES FROM THE RED SEA}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {83-96}, 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.2001.1692}, abstract = {The genus Helicometra Odhner, 1902 (Trematoda : Digenea : Opecoelidae) was briefly reviewed. The digeneans now referred to H. marmoratae Nagaty and Abdel-Aal, 1962 and H. nasae Nagaty and Abdel-Aal, 1962 were collected from their original fish hosts at Hurgada, Red sea, Egypt. These species are redescribed in details and figured. The given redescriptions are broadened and revealed that H. marmoratae is actually a synonym ofH. pulcheHa (Rudolphi, 1819) Odhner, 1902 (the type species of the genus), while H. nasae is actually a synonym of H. equilala (Manter. 1933) Siddiqi and Cable, I960. However, the misidentification of these species was discussed.}, keywords = {missed}, url = {https://ejabf.journals.ekb.eg/article_1692.html}, eprint = {https://ejabf.journals.ekb.eg/article_1692_95388d7e828bd30c184bdb8fa5bbc69c.pdf} } @article { author = {Ahdel-Mosits, Mohamed and Nour EL-DIN, Nehad}, title = {CHEMICAL COMPOSITION OF THE ZOOPLANKTON COMMUNITY SUBJECTED TO LANDBASED ACTIVITIES ALONG ALEXANDRIA COASTAL WATERS}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {97-109}, 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.2001.1693}, abstract = {The chemical composition of zooplankton has been studied during I QV^^OOO along the coastal waters of Alexandria from 8 stations representing different areas subjected to different types and quantities of landbased activities. The annual averages of carbon- nitrogen and phosphorus contents during the period of study were 45-3%, 5.84% and 0.42%, respectively. The N:P ratio for zooplankton was 13.9 while that of C:N ratio was. 7.75> i.exemarkably higher than that reported for marine organisms. Organisms collected opposite to sewage discharge were characterized by high chemical components while opposite to industrial discharge, the zooplankton chemical components were minimum. The chemical composition of zooplankton is mostly affected by the variations of available food represented by chlorophyll a concentrations.}, keywords = {Zooplankton,Chemical composition,coastal pollution. Alexandria}, url = {https://ejabf.journals.ekb.eg/article_1693.html}, eprint = {https://ejabf.journals.ekb.eg/article_1693_2cde32511f2a2d6e91e65c1814d332cb.pdf} } @article { author = {Hassanine, Reda}, title = {PARASITIC CASTRATION OF TRIDACNA MAXIMA (MOLLUSCArBIVALVIA) BY BUCEPHALID LARVAE (TREMATODA: DIGENEA) IN THE NORTHERN RED SEA}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {111-122}, 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.2001.1694}, abstract = {In late winter 2000, 160 mature individuals of the hermaphroditic giant clam Tridacna maxima (Bivalvia: Tridacnidae) were collected as a random sample from a wild bed inhabiting the coasts of Sharm El-Sheikh, Northern Red Sea, Egypt. Examination revealed that the gonads of 36 individuals (22.5%) were castrated by the sporocysts and cercariaeof a bucephalid trematode species (Digenea: Bucephalidae). Although the prevalence was moderate, its effect on the reproductive capacity of these clams was significant, since the gonads of 21 individuals (13.13%) were heavily infected and completely castrated, while those of 15 individuals (9.37%) were slightly infected and partially castrated. Sporocysts and cercariae were described and figured, and the mechanism of parasitic castration was discussed. It was concluded that such parasitic castration may harmly affect the overall fecundity of the whole population of T, maxima inhabiting the coasts of Sharm El-Sheikh; and possibly other areas the Northern Red Sea.}, keywords = {Digenean trematodes,Bucephalidae,parasitic castration-Mo 11 usca,Bivalvia,Tridacna maxima,Red}, url = {https://ejabf.journals.ekb.eg/article_1694.html}, eprint = {https://ejabf.journals.ekb.eg/article_1694_3d305d622eead460c85369161c148e45.pdf} } @article { author = {Al -Amoudi1, Mohamcd and El-Ghobashy, Ahamed and B.M., El-Nouman1}, title = {EFFECT OF GOAT MANURE INCORPORATION AS A SUBSTITUTION TO DIETARY FISH MEAL ON THE PERFORMANCE OF TILAPIA (OREOCHROMIS SPJLURUS Gunther) REARED IN TANKS,}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {123-135}, 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.2001.1695}, abstract = {  This study was conducted to determine the suitability of dried Goat Manure Meal (GMM) as an ingredient for tilapia (Oreochromis spilurus) feed. Five experimental diets (I, 11, 111, IV and V) were formulated to contain 35%, 30%,25%,20% and 15% crude protein respectively. Diet I without GMM and contained fish meal, minerals, vitamins, lipids, dextrin, a-ce!lulose and carboxymethylcellulose (binder). Diets 11,111,IV and V contained GMM as a substitution to part of the fish meal. Diet VI contained 100% GMM and it had 19.4% crude protein. The 56-day feeding trial was conducted in triplicates treatment in 200 L circular fiber glass tanks with sea water which was changed every 4 hours. The maximum growth rate was obtained with diet I (control). There was a trend of reduced growth performance and FCR with increase in GMM level for all treatments. Significant decreases (P70.05) of lipid levels and increases of carbohydrates and ash levels of the fish muscles were recorded. However, the maximum saving of fish meal with good weight gain and FCR were obtained with the diet containing 19.8 GMM. Because of the low price of tilapia, it is not economical to feed them with high protein, expensive feed. Therefore, it can be concluded that low inclusion of GMM in tilapias diet is recommended.}, keywords = {manure meal,Nile tilapia,Growth performance}, url = {https://ejabf.journals.ekb.eg/article_1695.html}, eprint = {https://ejabf.journals.ekb.eg/article_1695_25bc57d4be6aa1f9630e484997d52b07.pdf} } @article { author = {A. Wassef, Elhani and Sweilum, Mohamed and Attalla, Raky}, title = {GROWTH PERFORMANCE OF NILE TILAPIA (OREOCHROMIS NILOTICUS ) AS AFFECTED WITH DIETARY INCORPORATION OF FERMENTED FISH SILAGE OR BOILED FULL FAT SOYBEANS AS PROTEIN REPLACERS}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {137-150}, 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.2001.1696}, abstract = {Two experiments were performed in order to evaluate two feed stuffs, namely fermented fish silage (FFS) and boiled full-fat soybeans (BFS) as alternative protein sources for fish meal (FM) or fish meal replacers in Nile tilapia feeds. Both FFS and BFS performed well up to 50% substitution of FM without a significant loss in performance reared fish. These results also indicated that FFS is a promising feed ingredients for substituting fish meal at 25-50% dietary protein in Nile tilapia diets.When different levels of boiled full-fat soybeans (BFS) were tested in the next experiment, similar results were obtained. Among this tested levels, substitution of fish meal with 25% dietary BFS was possible without any significant reduction in performance parameters The utilization of FFS or BFS as the only dietary protein source (100%) significantly reduced growth performance of the tested fish.}, keywords = {Fish culture,Oreochromis niloticus,growth rate,fish meal replacers,feed and protein utilization,Fish production}, url = {https://ejabf.journals.ekb.eg/article_1696.html}, eprint = {https://ejabf.journals.ekb.eg/article_1696_3616757e5a32ff622b71a004b8cc0ddf.pdf} } @article { author = {Mohammed, Ragab}, title = {EFFECT OF DIETARY PROTEIN SOURCE ON GROWTH OF OREOCHROMIS NILOT/CUS}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {151-163}, 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.2001.1697}, abstract = {Oreochromis niloiicus fingeriings with initial body weight and length ranging from 20 to 39.5g and from 10 to 13.5cm., respectively .were reared in two cement ponds at a density of 4 fish/m". The two cement ponds were divided into five equal divisions (partitions) by nets. Fishes in each partition were fed on one of the experimental diets at 3% of body weight 6 times a week for a period of 130 days.This research was carried out at Al-Kanater AL-Khayria Fish Research Station to study the effect of dietary protein sources on growth of O. niloticus. Growth rate, average daily gain, specific growth rate and feed conversion ratio were determined. The results indicated that the highest growth rate (0.86), highest specific growth rate (0.96), maximum weight gain percentage (250.6%) and the lowest feed conversion ratio (2.37) were obtained for fish fed the formulated diet containing 25% protein, whereas the opposite was found for fish fed wheat bran alone. Results also showed that animal protein diet was better than plant protein diet for tilapia feeding. From the economical point of view,the results indicated that the balanced diet containing 20% protein was the most suitable diet for fish feeding in the cement ponds.}, keywords = {missed}, url = {https://ejabf.journals.ekb.eg/article_1697.html}, eprint = {https://ejabf.journals.ekb.eg/article_1697_fada6991db8cfd1bdd8d41be506e6dc8.pdf} } @article { author = {Nour El-Din, Nehad}, title = {ECOLOGICAL INVESTIGATION OF THE TINTINNID COMMUNITY ALONG THE COASTAL WATERS OF ALEXANDRIA, EGYPT}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {165-177}, 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.2001.1698}, abstract = {The distribution of the tintinnid assemblages was studied in samples collected from 2 areas subjected to primary treated sewage flow and agricultural/industrial mixed discharge along the coastal water of Alexandria during summer 1999 and winter 2000. During the entire investigation, the protozoopiankton were numerically dominated by tintinnids with densities ranging between 26 and 9464 Ind./m .Distinct differences that appeared in the patterns of occurrence andnumbers of the tintinnids in those locations, were attributed to different physical and chemical conditions.Tintinnid assemblages were represented by 19 species, the most dominant of which were: Tintinnopsis beroidea, Favellaehrenbergii, Eutintinnus macilentus and Tintinnopsis campanula. Two freshwater tintinnids appeared at the near-shore locations of El-Mex Bay during high flow when salinity reached 9 psu.}, keywords = {Ecology,tintinnids,protozoopiankton,coastal waters,alexandria}, url = {https://ejabf.journals.ekb.eg/article_1698.html}, eprint = {https://ejabf.journals.ekb.eg/article_1698_dcf6ad7ef870e2e5ec148a8e0f098c06.pdf} } @article { author = {Mehanna, Sahar}, title = {DYNAMICS AND MANAGEMENT OF THE INDIAN MACKEREL RASTRELLIGER KANAGURTA (CUVIER, 1816) IN THE GULF OF SUEZ, EGYPT}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {179-194}, 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.2001.1699}, abstract = {Based on the otolith's readings of 678 specimens collected during the fishing season 1998/1999, age, growth, mortality and yield per recruit of Rastrelliger kanagurta from the Gulf of Suez were studied. Age composition showed no variation between the two sexes. The oldest males and females were four years old. The values of the von Bertalanffy growth parameters were K = 0.66 year"1 and L^ = 29.48 cm for males and K = 0.60 year"1 and Loo = 32.04 cm for females. The mean total mortality coefficient "Z" was found to be 1.12 year"1 for males and 1.00 year"1 for females. The natural mortality coefficient "M" was 0.26 year"1 for males and 0.25 year"1 for females. The yield per recruit was estimated using the parameters obtained for the combined sexes. The results suggest that the present level of fishing mortality (F= 0,82) is much higher than that which gives the maximum yield per recruit.}, keywords = {Rastrelliger kanagurta,Scombridae,Gulf of Suez,age and growth,mortality%,yield per recruit}, url = {https://ejabf.journals.ekb.eg/article_1699.html}, eprint = {https://ejabf.journals.ekb.eg/article_1699_3f30a45c3c21d5658bd4f9a854dc84d5.pdf} } @article { author = {Khattab, Yassir and Abdel-Tawwab, Mohsen and H. Ahmad, Mohammad}, title = {EFFECT OF PROTEIN LEVEL AND STOCKING DENSITY ON GROWTH PERFORMANCE, SURVIVAL RATE, FEED UTILIZATION AND BODY COMPOSITION OF NILE TILAPIA FRY (OREOCHROMIS NILOTICUS L.)}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {195-212}, 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.2001.1700}, abstract = {This study was carried out to evaluate the growth response of Nile tilapia; O.niloticus L. to dietary protein levels at two stocking densities. This study was bifactorial designed (3 protein levels x 2 stocking densities). Fish (1.8-2.5 g/fish) was randomly distributed into the aquaria at a rate of 15 or 30 fish/100 L. The temperature was adjusted at 27±1 °C. Fish of each density were fed either a diet containing 25%, 35% or 45% CP with a feeding rate of 4% of body weight twice daily for 5 days a week for 70 days,The obtained results showed that the final body weight, weight gain, weight gain %, specific growth rate (SGR)were positively affected by protein level and inversely affected by stocking density, but not affected by their interaction. Condition factor was significantly affected only with dietary protein levels (PO.05), while survival rate did not differ significantly by protein levels or stocking densities. The maximum growth was obtained with 45% CP at low density (10 J g/fish), whereas the lowest growth was obtained with 25% CP at high density (6.4 g/fish). On the other hand, the reduced growth at high density could be recovered by increasing the protein levelFeed intake increased significantly with increasing dietary protein level only (PO.01). Feed conversion ratio (FCR), protein efficiency ratio (PER) and protein productive value (PPV) were significantly affected by protein level and stocking density (PO.01), The best FCR was obtained with 45% protein diet at low density (1.72) and with 35% under low density (1.8.1) with insignificant: (1.72) and with 35% under low density (1.81) with insignificant difference (P>0.05). The highest values of PER and PPV were obtained with 25% CP at low (1.913 and 30.54%, respectively) and high density (1.720 and 26.64%, respectively) with significant difference (PO.01).Moisture was significantly affected by protein level only (PO.05), while crude protein, total lipids and ash were significantly affected by protein level and stocking density. The highest protein content in fish body was obtained with 45% CP at low and high densities (58.0% and 57.9%, respectively; P>0.05). The highest content of body lipids was observed in fish fed 25% protein diet at low and high densities (32,8 and 31.0%, respectively; P>0.05). The highest content of carcass ash was noticed in fish fed 45% protein diet at low and high densities with significant difference (15.6% and 16.8%, respectively; P<0,05).}, keywords = {protein level,stocking density,fish growth,Nile tilapia,feed utilization and body composition}, url = {https://ejabf.journals.ekb.eg/article_1700.html}, eprint = {https://ejabf.journals.ekb.eg/article_1700_1f99b093c73d0ce0041ed7f1c81bdffc.pdf} } @article { author = {EL Aly, Reda}, title = {MORPHOLOGICAL STUDIES ON THE FRESHWATER SNAIL CLEOPATRA BULIMOIDES (OLIVIER) ( PROSOBRANCHIA - THIARIDAE ) 2- THE NERVOUS SYSTEM}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {213-225}, 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.2001.1701}, abstract = { Investigations of the pattern of neurosecretion in the prosobranch snail Cleopatra bulimoides were carried out. The nervous system consists of four paired and three unpaired ganglia. They are connected to each other by commissures and connectives. Although neurosecretory cells are present in all the ganglia examined, they are lacking in both connectives and commissures. The neurosecretory cells are classified into three types; two of them (A and B) are distributed all over the nervous system, while the third type (C) is localized only within the cerebral ganglia. Cleopatra bulimoides acts as an intermediate host for the digenetic trematode Gastrodiscus aegypticus, a parasite of cattle.}, keywords = {Cleopatra,Prosobranchia,anatomy,neurosecretion,nervous system}, url = {https://ejabf.journals.ekb.eg/article_1701.html}, eprint = {https://ejabf.journals.ekb.eg/article_1701_c65f60ea3a1bc454808f313f84a9d1b8.pdf} } @article { author = {El-Fiky, Nabil}, title = {TOXIC AND TERATOGENIC EFFECTS OF COPPER SULPHATE ON THE DEVELOPING EMBRYOS AND LARVAE OF SILVER CARP, HYPOPHTHALM1CHTHYS MOLITRIXVAh. AT TWO TEMPERATURES}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {227-261}, 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.2001.1702}, abstract = {iualitative, quantitative, morphological, histopathological and scanning electron microscopy studies were combined to evaluate the effect of three different concentrations of copper sulphate (CUSO4) (0.15, 0.2 and 0.3 mg/1) on the embryonic development and newly hatched larvae of silver carp, Hypophthalmichthys molitrix (Valenciennes, 1844).) The general development was described briefly. The tail bud stage becomes visible after 32 hours of fertilization, while pharyngula stage becomes visible after about 40 hours. Severe defects during embryonic development arise in theexperimental groups. The rate of embryonic development was shorter at higher temperature in both control and metal exposed groups. Hatching started almost 15 hours earlier at 26° C than at 20° C. At both temperatures, as the concentration of copper in water increased the percentage of deformed larvae increased, comparing to that of thecontrol. At both temperatures, all normal larvae from copper sulphate exposure began dying gradually from the beginning of rearing. The survival rate of the deformed larvae was considerably lower. Copper sulphate that caused growth inhibition might have been related to under-developed swimbladder which impaired fish activity and feeding. The neurotoxic effect of copper sulphate on silver carp involves a retardation of neurological development of the superficiallylocated neuromasts on the head. The neuromasts which are segmentally arranged exhibits bi-directional polarity. Copper sulphate also caused inhibition of skeletal ossification which might have resulted from disturbance of ionic regulation. The malformations of the deformed larvae (vertebral curvature & locomotion) caused impairment of swimming and feeding. Copper sulphate becomes a strong toxicant in excessive concentrations (from 0.15 mg/1). Copper sulphate less than 0.3 mg/7 is considered to be suitable for the control of algae (algicide), in lakes, reservoirs and fish cultures (Stominska and Jezierska, 2000). We could also safely use this substance for killing bacteria and parasites in fish culture (Roberts and Beitinger, 1974).}, keywords = {toxicity,teratogenicity,copper,sulphate,embryonic-ievelopment,Silver carp,Hypophthalmichthys,temperature?}, url = {https://ejabf.journals.ekb.eg/article_1702.html}, eprint = {https://ejabf.journals.ekb.eg/article_1702_8f6e060644cf9f5a60543d99a131f393.pdf} } @article { author = {Rabeh, Saleh}, title = {ECOLOGICAL STUDIES ON NITROGEN CYCLE BACTERIA IN LAKE MANZALA, EGYPT}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {263-282}, 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.2001.1703}, abstract = {Six stations were chosen to represent the different micro-habitats along the southern part of Lake Manzala. In addition, two main drains, Bahr El-Baqar and Hadous were represented. Water and Bottom sediments were collected through four successive seasons (Autumn 1999 - Summer 2000) for physico-chemical and bacteriological analyses. The results showed that water temperature recorded the lowest value during Winter, while it recorded the highest during Summer with an annual amplitude 14.8°C. The Lake is shallow with a depth ranging from 0.85 - L31 m. The pH values were in the alkaline side. The water transparency fluctuated from 19.5 - 325 cm . The organic matter and organic carbon ranged from 5.28 - 8.71% and 3.06 - 5.06%, respectively. Bacteriological analysis showed that the highest counts of the studied bacteria were recorded in Bahr El-Baqar and Hadous Drains compared with Lake Manzala' stations.Conversly , the lowest counts of nitrifying bacteria were recorded in Bahr El-Baqar Drain and its discharge points.}, keywords = {Lake Manzala,nitrogen cycle bacteria}, url = {https://ejabf.journals.ekb.eg/article_1703.html}, eprint = {https://ejabf.journals.ekb.eg/article_1703_909c7d5e91ac1e331a72dbaa89c50c82.pdf} } @article { author = {}, title = {(بعض المتغيرات الحيه وغير الحيه المؤثره في الانتاجيه الأوليه لبحيره عاليه الخصوبه (بحيره قارون مصر}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {5}, number = {3}, pages = {1-18}, 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.2001.1704}, abstract = {}, keywords = {}, url = {https://ejabf.journals.ekb.eg/article_1704.html}, eprint = {https://ejabf.journals.ekb.eg/article_1704_b4f28c8ed93a5200600045b6f5494479.pdf} }