@article { author = {Ibrahim, Abdalla and Ibrahim, Wafaa and Abou-Aouf, Noran}, title = {ULTRASTRUCTURAL STUDY ON THE EFFECT OF A PLANT MOLLUSCICIDE (SOLANUM HERMAPHRODITE GLANDS OF BIOMPHALARIA ALEXANDRINA}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {10}, number = {3}, pages = {1-22}, year = {2006}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2006.1859}, abstract = {Ultrastructure examination was applied to study the effect of short' (4 days) and long (10 days) exposures to sublethal concentration (1 ppm ) of ethanol extract of Solarium elaeagnifolium seeds (S. etaeag. ) (Family: Solanecae) on the digestive gland and hermaphrodite gland of infected and uninfected the pulmonate snail Biomphalaria alexandrina.Ultrastructural studies of the above two glands of infected snails illustrated remarkable cytologicai changes due to the infection with marked increase in the cytoplasmic vacuolation that almost occupied the whole cell of the digestive gland,The ultrastructural changes in the digestive and hermaphrodite gland cells due to exposure of snails to ethanol extract of the candidate plant showed degeneration in the nucleus, nucleolus and mitochondria with abnormal Golgi complex as well as in glycogen digestion.}, keywords = {Ultrastructure,Solarium,Digestive gland,Hermaphrodite gland,Biomphalaria alexartdrina}, url = {https://ejabf.journals.ekb.eg/article_1859.html}, eprint = {https://ejabf.journals.ekb.eg/article_1859_d7d5e43846b3560f0584cb6be21d0743.pdf} } @article { author = {EI-Gamal, Amin and Elsayed, Manal}, title = {GENETIC AND PHENOTYPIC PARAMETERS OF WEIGHT AND LENGTH TRAITS OF THE NILE TILAPIA OREOCHROMIS NILOTICXJS (LINNAEUS)}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {10}, number = {3}, pages = {23-32}, year = {2006}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2006.1860}, abstract = {Heritability of and genetic correlation of two traits, weight and length,. measured in Oreochromis niloiicus (1150 records) were estimated using MTDFREML programme. The model included fixed effect of line (four lines: Giza (G)} Fouky (F), Mariut (M) and Nag Hamady (N)). Besides, the model included the effects of individual (fish), sire and dam as random effects. The results of h2 for the two traits were 0,99, 0,87, respectively. The genetic correlation between the two tested traits was 0.91. Ignoring line effect, the same previous model was used to estimate heritability and genetic correlation for the two studied traits for each line. Line N recorded the best estimate of h2 for weight (1.0), whilst line M had the highest estimate of/^ for length (0.97). The estimated genetic correlation (0.98) for line M was higher than that of the other experimental lines.}, keywords = {Oreochromis nilotiats> Nile tilapia,genetic correlations,phenotypic parameters,weight,length,MTDFREML programme}, url = {https://ejabf.journals.ekb.eg/article_1860.html}, eprint = {https://ejabf.journals.ekb.eg/article_1860_d2059a24aa08768e6f0d7d49cbfc254e.pdf} } @article { author = {EL-GAMAL, Amin}, title = {TIMING OF HYPOPHYSATION PROCESSES IN THE SILVER CARP HYPOPHTHALMICHTHYS MOLITRIX (VALENCIENNES) AND AN ATTEMPT TO EMPLOY THE CONCEPT OF LATENCY TIME}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {10}, number = {3}, pages = {33-54}, year = {2006}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2006.1861}, abstract = {The objectives of the present work were to study the ovulatory response of silver carp when induced to breed using carp pituitary powder as an ovulation stimulator at various hours of the day. Furthermore, an attempt was carried out to determine the natural latency time, i.e. degree-hours hoping that it would be possible to employ it in carp hatchery procedures. Therefore, two experiments were carried out; in the first, the response to hormonal stimulation and the reproductive performance of female carps received a decisive injection with a spawning stimulator at different day times: 04.00 p.m., 08.00 p.m. and 11.00 p.m. was evaluated. In the second experiment, an estimate for the latency time in terms of degree hours was determined by placing pre-ovulating females with fertilizing males and measuring the time elapsed till the natural spawning occurred. The relevance of this measured time was then tested in artificially induced spawning females groups.The results revealed that percentage of ovulated females was higher (100%) in the group received the decisive pituitary injection at 04.00 p.m.* than those received it at 08.00 p.m. and 11.00 p.m. (87.5% and 93.8%, respectively). Injection time, however, had no effect on weight and quality of the obtained eggs when assessed in terms of percentages of fertilization, survival rates and percentage of deformed larvae, Nevertheless, combining results from ovulation and incubation success (spawning effectiveness coefficient) showed that injection time affected egg quality. The present results showed that the best overall quality of the sexual products was produced when female silver carps received the decisive injection at 04.00 p.m. when compared to those received it at either 08.00 p.m. or 11.00 p.m. The measured natural latency time was approximately 7.4 h which is equivalent to 188.4 ±1.99 degree hours at a constant water temperature of 25.5 °C, although the latency time of artificially spawned females was 199±1.74 degree hours under the same conditions. The presence of males with the spawning female groups significantly (PO.05) increased the percentage of ovulated females from 92-2% to 100% and decreased the average latency time of the spawning females by approximately 24 minutes.}, keywords = {Silver carp,hypophysation,induced breeding,latency time,reproductive traits}, url = {https://ejabf.journals.ekb.eg/article_1861.html}, eprint = {https://ejabf.journals.ekb.eg/article_1861_13dea376b1afd75360caf87f53d37132.pdf} } @article { author = {El-Shebly, Abdalla}, title = {EVALUATION OF GROWTH PERFORMANCE,PRODUCTION AND NUTRITIVE VALUE OF THF AFRICAN CATFISH, CLARIAS GARIEPINUS.CULTURED IN EARTHEN PONDS.}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {10}, number = {3}, pages = {55-67}, year = {2006}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2006.1862}, abstract = {^mall African catfish, Clarias gariepinus collected from the ^neighbouring harvested farms with 21.67 cm and 88.24g average individual length and weight respectively. Fish were stocked in a freshwater earthen pond, with an area of 2 feddans and a bout 2 meters, at a rate of 22600 fish/ feddan (2000 kg/ feddan). Growth performance, production, nutritive value and net return were evaluated for 8 months. The fish attained an average final length of 47.4 cm/fish and an average final weight of 846 g/fish. The final total biomass was 18500 kg/feddan. The biochemical analysis of Clarias gariepinus flesh revealed high nutritive value, where total protein was 15.65 % and total lipid was 3.13 % on wet weight basis. The economic evaluation revealed high net return of 68500 L. E. /feddan during the rearing period (8 months) with investmental return of 3.85 L. E. /1 L. E. Cost.}, keywords = {African catfish,Growth performance,production,nutritive value,Economic Evaluation}, url = {https://ejabf.journals.ekb.eg/article_1862.html}, eprint = {https://ejabf.journals.ekb.eg/article_1862_80525275f4e79b691a8efa3be577e3bc.pdf} } @article { author = {Abou-Seif, Ramadan}, title = {EFFECTS OF STOCKING DENSITY AND PROTEIN LEVEL IN DIET ON GROWTH PERFORMANCE, SURVIVAL RATE AND FEED EFFICIENCY OF NILE TILAPIA (OREOCHROMIS NILOTICUS L.) FRY MONOSEX DURING THE NURSERY PERIOD.}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {10}, number = {3}, pages = {69-84}, year = {2006}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2006.1863}, abstract = {The effects of stocking density and dietary protein levels on growth performance, larval survival and feed utilization efficiency of Nile tilapia (O. niloticus L.) fiy monosex (0.014 g average initial body weight) were investigated in a single-stage nursery-rearing system using 1389 and 2778 hatchlings/ m3 as stocking densities within each density 29.71, 34.43 and 39.11% dietary protein levels. Twelve fiberglass tanks (180 liter volume for each) on a flow- through system (100%/day)were used to represent the two stocking densities and the three protein levels in replicates. The dietary treatments were fed 7 days/week (twice daily) at a rate of 15% of the total biomass during the 1st 45-days then reduced to 10% of total biomass from days 46 to 75, after that it was reduced to 5% of total biomass till the end of the experiment (105 days).The results revealed that there was significant increase (P< 0,01) in growth rate with decreasing stocking density and increasing dietary protein level during all experimental periods. The same trend was also observed for mean body weight (g), specific growth rate (SGR%/day), condition factor (k) and survival rate (SR %). The best final mean body weight (g), SGR, K and (SR %) were recorded in groups of fish stocked in 1389 hatchlings /m3 and fed on the diet containing 39.11% CP)(T3SR1).The effects of stocking density and dietary protein levels on growth performance, larval survival and feed utilization efficiency of Nile tilapia (O. niloticus L.) fiy monosex (0.014 g average initial body weight) were investigated in a single-stage nursery-rearing system using 1389 and 2778 hatchlings/ m3 as stocking densities within each density 29.71, 34.43 and 39.11% dietary protein levels. Twelve fiberglass tanks (180 liter volume for each) on a flow- through system (100%/day)were used to represent the two stocking densities and the three protein levels in replicates. The dietary treatments were fed 7 days/week (twice daily) at a rate of 15% of the total biomass during the 1st 45-days then reduced to 10% of total biomass from days 46 to 75, after that it was reduced to 5% of total biomass till the end of the experiment (105 days).The results revealed that there was significant increase (P< 0,01) in growth rate with decreasing stocking density and increasing dietary protein level during all experimental periods. The same trend was also observed for mean body weight (g), specific growth rate (SGR%/day), condition factor (k) and survival rate (SR %). The best final mean body weight (g), SGR, K and (SR %) were recorded in groups of fish stocked in 1389 hatchlings /m3 and fed on the diet containing 39.11% CP)(T3SR1).  }, keywords = {Nile tilapia,stocking density,protein level nursery,rearing period}, url = {https://ejabf.journals.ekb.eg/article_1863.html}, eprint = {https://ejabf.journals.ekb.eg/article_1863_63464e8681954a1ff1af0812500b0c89.pdf} } @article { author = {Kanial, Salah}, title = {AQUAPONIC PRODUCTION OF NILE TILAPIA(OREOCHROMIS NILOTICUS) AND BELL PEPPER (CAPSICUM ANNUUML.) IN RECIRCULATING WATER SYSTEM}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {10}, number = {3}, pages = {85-79}, year = {2006}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2006.1864}, abstract = {Aquaponics is the combined culture of fish and hydroponic plants in recirculating systems. An integrated fish and hydroponics bell pepper system was evaluated for application in Central Laboratory for Aquaculture Research at Abassa, Sharkia Governorate, The system was constructed from readily available materials, and designed to minimize capital costs, energy, water use, and the technological skills needed for operation. Nile tilapia (Oreochromis niloiicus) and bell pepper (Capsicum annuum L. 'Godeon') were cultured for 180 days in a closed system containing 1160 L of water for each unit. Six units were used with three treatments (all three treatments were in duplicated) to determine the effect of the integration between plant number /m2 to fish density (100 fish /m3) on fish performance. Each unit consists of 500 L fish rearing tank, hydroponic tank (2 m2), filter and sump. Treatments were Ti (fish culture with 10 plant/m2), T2 (fish culture with 15 plant/m2) and T3 fish culture without plant (control). Water quality suitable for fish production was maintained by aeration, mechanical and biological filtration, hydroponics vegetable production unit and the addition of make-up water. Fish metabolites, and wasted feed served as nutrient sources for pepper production. The results showed that Ti (fish culture with 10 plants /m2) gave the best significant (P<0.05) fish production 20.1 kg / m , followed by T2 (fish culture with 15 plants /m2) 17.95 kg / m and the lowest (P<0.05) was T3 fish culture without plant (control) 16.3 kg / m3. Also Ti (fish culture with 10 plants /m2) was higher in average yield of marketable bell pepper 11.34 kgfai2 (P>0.05) than T2 (fish culture with 15 plants /m2) which produced 9.43 kg/m2. Under the condition of the present study, results show in general that units integrated with hydroponic pepper T] and T2 resulted in best economic efficiency, and Ti was better than T2.}, keywords = {Aquaponics,Integrated,Hydroponic,Nile tilapia,pepper}, url = {https://ejabf.journals.ekb.eg/article_1864.html}, eprint = {https://ejabf.journals.ekb.eg/article_1864_47c2277f7680621e637465f14dcc43e5.pdf} } @article { author = {Lotfy, Ibrahim}, title = {TRACE METALS ACCUMULATION IN MOLLUSCAN SHELLS FROM DAMIETTA NILE BRANCH SEDIMENTS, EGYPT}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {10}, number = {3}, pages = {99-116}, year = {2006}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2006.1866}, abstract = {The dissolved heavy metals (As, Ba, Cd, Cr,Co, Cu, Fe, Mn. Mo, Ni, Pb3 Se, Sr, V and Zn) in molluscan shells from Damietta Nile branch sediments were estimated in three zones during April - June 2004.The average values (ppm*10"3) were 0.63, 0.3, 0.01, 0.05, 0.13, 2.32, 3.33, 1,97, 0.19, 0.22, 0.26, 0.5,2.51, 0.051 and 2.21, respectively,Results indicate that levels of heavy metals increased northwards and in nepionic (recent) stages and were positively correlated with salinity, chlorisity, alkalinity, dissolved oxygen and calcite mineral and negatively correlated with pH values and aragonite mineral Certain heavy metals such as As, Co, Cu, Fe, Mn. Mo and Pb were more abundant in bivalve shells(i.e. high aragonite), while Ba, Cd, Cr, Ni, Pb, Sr, V and Zn were more abundant in gastropod shells (i.e. high calcite).}, keywords = {trace metals,bivalves,gastropods,Environmental factors,DamiettaNiie branch}, url = {https://ejabf.journals.ekb.eg/article_1866.html}, eprint = {https://ejabf.journals.ekb.eg/article_1866_41c9f0d555e8cdf65c2c9c8ce24c9cc0.pdf} } @article { author = {Lofty, Ibrahim}, title = {TRACE METAL POLLUTION OF RECENT MOLLUSCAN SHELLS FROM LAKE QARUN SEDIMENTS, EGYPT}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {10}, number = {3}, pages = {117-136}, year = {2006}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2006.1867}, abstract = {This paper aims to present a complete picture on the trace metals distribution in the recent mollusk an shells from Lake Qarun sediments. The mollusk an shells were collected during August 2003 and analyzed for the trace metals viz: As, Ba, Cd, Cr, Co, Cu, Fe, Mn. Mo, Ni, Pb, Se, Sr, V and Zn. Their relative order abundance in bivalve shells was: Fe> Cu> Sr> Zn> Mn> Pb> Ni> Se> As> Ba> Cr> Mo> Co>V >Cd, while in gastropod shells was: : Fe> Zn> Mn> Sr> Cu > As > Pb> Se> Ba> Ni>Cr> Mo> Go> V> Cd. The elements were more abundant in gastropod shells. Most elements were associated with aragonite( i.e. nepionic stage) in eastern and middle zone close to the source of the elements and with increasing age( i.e. in adult stage) associated with calcite in western sector. This is due to the mineralogy of shells, secondary alteration, location, environmental parameters, activity of organisms and source of sediments.}, keywords = {Environmental factors,trace metals,mollusc shells,Lake Qarun}, url = {https://ejabf.journals.ekb.eg/article_1867.html}, eprint = {https://ejabf.journals.ekb.eg/article_1867_587141e7a44a430aade4584c3a4d9346.pdf} } @article { author = {Hamed, Mohamed and Okbah, Mohamed}, title = {TRACE METALS SPECIATION IN SEDIMENTS OF LAKE MANZALA, EGYPT}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {10}, number = {3}, pages = {137-146}, year = {2006}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2006.1868}, abstract = {Vediment samples were collected during summer, 2004 from Lake Manzala to determine the chemical association of trace metals (Fe, Mn, Cu, Zn, Pb, Cd, Co, Ni and Cr) in the lake sediments. Five fractions were extracted using sequential extraction techniques, which represent the major sedimentary phases including the exchangeable, carbonate, Fe-Mnoxides, organic fraction and residual metal. The results of metals speciation indicated that, the high proportion of trace metals were presented in the residual fraction which represents 50% of the total metals for Mn, Cu, Pb and reached to 73% of the total for Zn. The geochemical analysis of metal forms reflected the lithogenic origin of these metals inthe study area.The results also showed high percentage of Fe, Co, Ni and Cr in the organic fractions (40% of the total metal). High percentage of Cd was found in the carbonate fraction (32%). However, few percentages wererecorded in the exchangeable fraction of Fe, Cu and Zn (< 1% of total content), while increased from 2 to 6% of total Mn, Cr, Co, Ni and reached to 6% for Pb and 12% for Cd. It is evident from the results that the sediments of Lake Manzala are highly polluted with Cd, Cr, Ni and Co, and the greater amount of these were found in the non-lithogeousorigin (exchangeable, carbonate, oxides and organic materials).Multivariate techniques of statistical analysis have been applied to a set of chemical forms of metals obtained by the analysis of Lake Manzala sediments. The correlation matrix and principal component analysis were performed to show the behavior of the nine metals in eachfraction.}, keywords = {speciation,trace metals,sediments,Lake Manzala}, url = {https://ejabf.journals.ekb.eg/article_1868.html}, eprint = {https://ejabf.journals.ekb.eg/article_1868_2010908a337d81813fd2dffcbf4f7497.pdf} } @article { author = {Sweilum, Mohamed}, title = {EFFECT OF CHRONIC EXPOSURE TO SUBLETHAL LEVELS OF MERCURY ON TOTAL PRODUCTION, PHYSIOLOGICAL FUNCTIONS AND ECONOMICAL EFFICIENCY OF TILAPIA FISH, WITH REGARD TO PROPERTIES OF PONDS WATER}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {10}, number = {3}, pages = {165-183}, year = {2006}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2006.1869}, abstract = {The effects of chronic exposure to sublethal doses of mercuric chloride (0.310, 0.155 and 0.078 mg L"1) on growth rate, physiological parameters, chemical composition of tilapia species and properties of ponds water were studied for 180 days. Tilapia species (Oreockromis niloticus, Saroiherodon galilaeus and Oreochromis aureits) with an average initial size of 13 cm for total length and 50 g for body weight were stocked in fiberglass tanks (6 m2 area of each) at a rate of 15 fish m*2 (1:1:1) and fed on artificial diet containing 30 % protein. The physico-chemical properties of ponds water were slightly varied with different mercury levels. The plankton organisms (phyto - and zooplankton) were gradually decreased with increasing the mercury concentration in fish ponds. The final body weight, daily weight gain and production of tilapia fish were significantly decreased with increasing the mercury level. The lowest values of these parameters (17L5g, 0.67g, 1.518 ton feddan"1 for O. niloticus; 144g, 0.52g, L053 ton feddan"1 for 5. galilaeus and 153.5 g, 0.56 g and 0.995 ton feddan * for O. aureus) were observed in the pond containing highest mercury level (0.310 mg/L). The other growth performance (specific growth rate, percentage weight gain and normalized biomass index), feed utilization (feed conversion ratio, protein efficiency ratio and protein productive value) and survival efficiency of tilapia were also affected with sublethal levels of mercury. The net returns and profitability of the reared fish were also decreased with increasing mercury concentration in ponds water. The lowest hematocrit (28.5, 29.0 and 30 %) and hemoglobin (5.5, 5.0 and 52 g/100 ml blood) of the three fish species were obtained from the pond containing 0.310 mg/L HgCh. At the same mercury levels, the serum protein of the three fishes decreased to 7.0, 6.6 and 6-5 g/100 ml serum, while serum glucose increased to 8L0, 79-0 and 78.5 mg/100 ml serum. The biochemical composition of fish muscles was also influenced with different sublethal levels of mercury, where the muscle protein and glycogen were slightly decreased and lipid increased with increasing the mercury level. The mercury residues in liver, gills and muscles of the reared fish were increased with increasing the mercury concentration in ponds water and its value in liver was higher than that in gills and muscles.}, keywords = {tilapia,Growth,production,feed utilization,mortality,Blood,serum,Biochemical composition,mercury residues,water quality}, url = {https://ejabf.journals.ekb.eg/article_1869.html}, eprint = {https://ejabf.journals.ekb.eg/article_1869_553248ffcce96c50fa1a6f48cb949b70.pdf} } @article { author = {Hanafy, Mohamed}, title = {EFFECT OF REPLACEMENT OF SOYBEAN MEAL BY LINSEED MEAL ON GROWTH PERFOR MANCE,AND BODY COMPOSITION OF THE NILE TILAPIA,OREOCHROMIS NILOTICUS (L) CULTURED INCONCRETE PONDS.}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {10}, number = {3}, pages = {185-200}, year = {2006}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2006.1870}, abstract = {Afive-month feeding trial was conducted to evaluate the effect of eplacement of soybean meal by linseed meal and adding Yucca schidigera powder extract ,methionine and lysine on growth performance and body composition of Nile tilapia, Oreochromis niloticus (L) with an average initial weight of 30.8± 13 g/fish. The experimental* fish were divided into 18 groups and fed on pelleted feed containing each of the plant protein meal- supplemented with Yucca schidigera powder extract at 750 mg kg"1. Methionine (0.5%) and lysine (0.5%) were added to each diet except the control diet (FMC) which was supplemented with yucca only to examine the effect of replacement soybean with linseed meal on growth rate, feed conversion ratio (FCR), protein efficiency ratio (PER) and body composition of reared fish . Three groups of fish were fed on each of six isonitrogenous (25.2% C.P) and isocaloric (4.3 kcal g"1) feed, where the soybean meal (SBM) was replaced with linseed meal (LSM) at a levels of 0%, 25%, 50%, 75% and 100%.The experiment was performed in three concrete ponds and the valume of each was ( 40m3 ) (4 x 10 x 1.0 m , long, width, and height respectively ) . Ponds were divided into six units (6m2) by nets. The experimental fish were stocked at a rate of 10 tilapia/m2 (60 tilapia/unite). After five months of feeding , results revealed that the fish fed on plant protein diets supplemented with Yucca exhibited growth performance not differing significantly from that fish fed on FMC. Linseed levels in the diets were significantly influenced the whole body composition of the Nile tilapia. It has been revealed that increasing level of linseed, increased body moisture content and fat content, while protein content decreased. It was concluded that soybean could be completely replaced by linseed in Nile tilapia diets without adverse effect on growth rate, when diets supplemented with Yucca schidigera.}, keywords = {replacement,Soybean,Linseed,Nile tilapia,growth rate nutrition}, url = {https://ejabf.journals.ekb.eg/article_1870.html}, eprint = {https://ejabf.journals.ekb.eg/article_1870_6e2aa51a5a20910207711422f85becb8.pdf} } @article { author = {Gharib, Samiha}, title = {PHYTOPLANKTON DYNAMICS IN ESTUARY OF ROSETTA BRANCH OF RIVER NILE, EGYPT}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {10}, number = {3}, pages = {201-232}, year = {2006}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2006.1871}, abstract = {Phytoplankton biomass and species composition in Rosetta Estuary was analyzed at seven stations based on a programme of monthly sampling from February 2004 to January 2005 and supported by measurements of limnologicar parameters* Variations in water salinity appeared to be the key to all changes in water quality and phytoplankton biomass in Rosetta Estuary. Salinity ranged between 2.8 and 38.0 PSU. Water transparency showed a relatively low values with Secchi disc readings varying from 20 to 100 cm- The pH values are ranging between 7.3 and 9.3. Dissolved oxygen levels indicated good aeration conditions (4.0 - 13.2 mg f1). Nutrient salts varied widely, often occurring in high concentrations, with ranges of 0.2-19.9 \xg at.1"1 for nitrate, 0.1-8.0 ng at.l" 1 for nitrite, 0.0-4.9 ug at.l*1 for ammonia, 0.08-3.2 \ig at.l"1 for phosphate and L2-46.0 tig at.l for silicate.The phytoplankton community consisted of 152 species; Bacillariophyceae comprised the highest number of species (67) followed by Chlorophyceae (41), Cyanophyceae (18), Dinophyceae (16), Euglenophyceae (8), while Rhodophyceae and Dictyochophyceae were represented by only one species each. Chlorophyceae was the dominant group, forming 36.2% of the total phytoplankton biomass followed by Dinophyceae and Bacillariophyceae which ranked, respectively, 31.9% and 20.8% of the total phytoplankton biomass. The phytoplankton biomass ranged between 0.05 and 5.73 mg l"1, with an annual average of 2.06 mg l"1 .Highest biomasses were recorded in May and January due to the prevailing of freshvyater species Scenedesmus quadricauda, Selenastrum gracile, Actinastrum hantzchii, Schroederia sp., AnUstrodesmus setigera and Pediastrum simplex.}, keywords = {Phytoplankton biomass,physico-chemical parameters,River Nile Rosetta Estuary*}, url = {https://ejabf.journals.ekb.eg/article_1871.html}, eprint = {https://ejabf.journals.ekb.eg/article_1871_3232513683204e8a0af17c8187b09669.pdf} } @article { author = {}, title = {دراسه تأثير مبيد قواقع نباتي (سولانم إليجنيوفوليوم )علي الترکيب الدقيق لکل من الغده الهاضمه والغده التناسليه في قوقع بيومفلاريا الکسندرينا}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {10}, number = {3}, pages = {1-11}, year = {2006}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2006.1874}, abstract = {}, keywords = {}, url = {https://ejabf.journals.ekb.eg/article_1874.html}, eprint = {https://ejabf.journals.ekb.eg/article_1874_170ec3bec2952736dc1b8f746d916f83.pdf} }