@article { author = {Siliem, Nagat}, title = {Rearing studies on Oreochromis niloticus to evavaluate bacillus subtilis potential in growth performance and some physiological parameters}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {1-11}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2001}, abstract = { The present study was carried out to clarify the effect of adding Bacillus subtilis as a probiotic and growth promoter, to evaluate its potential for Oreochromis niloticus fingerlings growth performance. Used fish were divided into two groups according to their initial body weight; small size fish with average initial body weight 3.5 g. and length 3.7 cm. and big size fish with aver. IBW 15.3 g. and length 13.5 cm. Each fish group, was divided to four subgroups; T1 was the control that offered the basal diet only, while the other three subgroups ; T2 , T3 and T4 were fed on basal diets that contained B. subtilis solution with three different levels 5,10 and 15.0 ml /l00 g diet, contained 108 CFU ml- 1 respetively. Experimental period was 90 days in a three replicates. The results show that growth performance in small size O. niloticus (FBW), (WG), ADG and SGR values increased significantly with increasing B. subtilis levels. Differences, were observed with significantly higher values,recorded from the highest B. subtilis level, comparina to the control. Feedconversion rate showed decreases with the increasing B. subtilis level. Survival had best values for fish groups offered diets with adding B. subtilis. Serum analysis, total protein, albumin and globulin had the same pattern. Maximum values were recorded from T4 in contrast to the control (T1). Big size fish showed same results of growth performance, with significant differences between fish groups offered diets with B. subtilis and the control diet groups. Differences were significantly higher from treatment (4) compared to the control. F.C.R showed the lowest value from T4, while T1 recorded the highest value. Big size fish showed the same results in FBW, WG, ADG and S.G.R. Differences were observed with significantly higher values from fish groups offered diet contained high B. subtilis level. Compared to the control, F.C.R. showed the best and lowest value from treatment (4), in contrast to the control which recorded the highest value.Serum analysis (T.P.C), (A) albumen and (G) globulin increased significantly with the increase in B. subtilis level. Treatment (4) had the best values in contrast to the control. In both small and big size fish. A: G ratedecreased with the increasing B. subtilis level, best value was recorded from treat. (4), while T1 recorded the highest value. Small size fish had the best results and were more benefited from adding B. subtilis to their diets than those in big size fish. These results indicted that B. subtilis can be used effectively as a commercial product for enlrancing growth performance in aquaculture.}, keywords = {probiotic,Bacillus subtilis,Growth performance,Oreochromis niloticus,Aquaculture}, url = {https://ejabf.journals.ekb.eg/article_2001.html}, eprint = {https://ejabf.journals.ekb.eg/article_2001_8fcf2fc3f818a52ec7e1d4011fa9e65e.pdf} } @article { author = {El-Hammady, Ahmed and Attalla, Raky and Wassef, Elham and Wafa, Mohammed}, title = {Nutritional and feeding management Studies on hybrid Nile tilapia (Oreochromis niloticus x O. aureus)}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {13-25}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2002}, abstract = {Two experiments were performed in two or three way factorial design on Nile tilapia hybrid (O. niloticus x O. aureus) at the El kanater El khairyia Experimental Fish Research Station belonging to NIOF. The three experimentswere carried out in outdoor concrete tanks, each of 10m3 total water volume.Both experiments lasted 20 weeks after start and fish initial weights for the first and second experiments were 30.24 and 31.76 g, respectively.The first trial aimed to test the interaction between protein (25 or 30 % p25 or p30) and dietary energy levels (15.70; 16.74 or 18.84 Kj g-1 dry diet) on growth performance of hybrid tilapia. In the second experiment, three feedingrates (2, 4 or 6% biomass of fish R2 ;R4 or R6) within each rate two feeding frequencies (2 or 3 times /day F2 or F3 ) within each two stocking densities (25 or 50 fish /m3 D25 or D50) were tested for their effects on growth performanceof hybrid tilapia. Results of the first experiment revealed that the maximum growth performance of hybrid tilapia was obtained using the diet P25% E16.74KJ, which is recommended for hybrid tilapia. Results of the second trial recommended the feeding rate; frequency and stocking density of 4%; two times feeding at 25 fish/ mi density, respectively for best growth performance of hybrid tilapia.}, keywords = {hybrid tilapia,growth energy,protein,feeding ratio,feeding frequency,stocking denity}, url = {https://ejabf.journals.ekb.eg/article_2002.html}, eprint = {https://ejabf.journals.ekb.eg/article_2002_406d2c98621b395a0b685673897a6661.pdf} } @article { author = {Siliem, Nagat}, title = {Studies on growth performance and body composition of Nile tilapia (Oreochromis niloticus) and common carp (Cyprinus carpio) as affected by dietary supplemented biogen®}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {27-39}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2003}, abstract = {Three months feeding experiments were carried out in concrete ponds, filled with fresh water, in order to evaluate the probiotic (Biogen) potential, and assess its effect on growth and net returns of both O. niloticus in average initialbody weight 13.8±1.02 g. and body length 13.5±0.9 cm and Cyprinus carpio at mean initial body weight 15.3±0.05g and body length 13.5±0.05 cm Fish were fed basal diet that containd 30% crude protein, and Biogen® at four levels ( 0, 2,3 and 4g./kg. diet). O. niloticus and C. carprio were divided into (4) treatment groups . T1 was the control fed on basal diet without adding Biogen® , T2 , T3 and T4 fed on basal diet and Biogen® at levels 2, 3 and 4 g. /kg diet.The results show that: (FBW), (WG), (ADG) (S.G.R) and nutrient utilization (P.P.V), protein efficiency rate (PER) values were significantly (p<0.0l), higher in the treatments receiving probiotic than those offered thecontrol diet in both O. niloticus and C. carprio. Concerning the influence of different dietary Biogen® levels on the chemical proximate analysis of whole carcass ash was significantly (p<0.0l) higher for fish offered the control diet,while protein has a significant difference (p<0.0l) for fish offered basal diet contained Biogen® , than those offered the control diet, but results showed no clear trend. Differences were observed in carcass lipid and gross-energy contentwith significantly (p<0.01) higher values recorded in fish offered the control diets compared to fish fed a diet containing 3. g /kg. diet Biogen®.The production and subsequent cost - benefit analysis clearly indicated that the diets containing 3.g / kg. diet recorded the highest return. In comparison between O. niloticus and C. carpio, the results showed that the former recorded the highest significant values than C. carpio in all growth parameters and the netreturn. At the end of this research, results indicated that fish offered diets containing Biogen® exhibited greater growth than control. The observed improvement in fish growth, survival and net return by using probiotic bacteriacan open a new scope for intensive use in aquaculture.}, keywords = {Oreochromis niloticus,Cyprinus carpio,Biogen®,Growth performance,net return,body composition}, url = {https://ejabf.journals.ekb.eg/article_2003.html}, eprint = {https://ejabf.journals.ekb.eg/article_2003_98eb95c1e2b2ade198a3ce04e4572db5.pdf} } @article { author = {Attalla, Raky and Mikhail, Samia}, title = {Effect of replacement of fish meal protein with boiled full fat soybean seeds and dried algae on growth performance, nutrient utilization and some blood parameters of Nile tilapia (Oreochromis niloticus)}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {41-61}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2004}, abstract = {Mixture of boiled full fat soybean seeds and dried algae (Dunaliella spp.) at mixing level of 1:1 was tested to replace fish meal protein at 50% (soybean); 50% mixture ; 75% mixture ; 100% mixture and 100% soybean, onNile tilapia fry of initial weight 1.2 ± 0.05 g. Results obtained are summarized as follows : 1- Incorporation of the mixture of soybean seeds with dried algae in diets of Nile tilapia fry at 50 and 75% levels released no significant effects on final weight average weight gain, daily gain and survival rates, compared to the control groups, while the same parameters were decreased significantly in the other treatment groups.2- Replacing fish meal protein with the mixture of soybean seeds plus dried algae (1:1) at 50% level had insignificant effects on feed conversion and proteinefficiency ratios compared to the control groups, while the same parameters were negatively affected in the other group.}, keywords = {Nile tilapia,Growth performance,algae,survival rates,fish protein}, url = {https://ejabf.journals.ekb.eg/article_2004.html}, eprint = {https://ejabf.journals.ekb.eg/article_2004_8b61acc93472b3f95583c697617ca8f6.pdf} } @article { author = {Wally, Naglaa and Abdel-Hakeem, Nabil and Eldimiri, Ahmed}, title = {Economic Efficiency for Egyptian Marine Fishing Fleet Exploitation}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {63-71}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2005}, abstract = {The Egyptian fishing fleet on Mediterranean Sea and the Red Sea has an excessive size, which means that there are number of fishing vessels that could have been working else where or the investments that were allocated for these excessive fishing vessels could have been allocated for other economically viable projects. In 2006, it was estimatedin the Mediterranean Sea fishing fleet has about 825 standardized mechanized fishing boats worth of 181,68 that can be allocated else where.In respect to the Red Sea fishing fleet, the excessive number of standardized mechanized fishing boats are 648 units worth of LE 142,7 ml. Reduction programmes in Egyptian fishing fleet-size to tackleovercapacity to reduce the number of fishing vessels by 1473 standardized units worth of LE 324.3 ml. These measures will protect the fishery resources and make fishing economically viable for the remaining fishing vessels in business. Having these programmes implemented will increase the average annual production per standardized fishing vessels inthe Mediterranean Sea by 28% and in the Red Sea by 66.6%.}, keywords = {fishing fleet,Egypt,economic efficiency,Exploitation,Red Sea,Mediterranean Sea}, url = {https://ejabf.journals.ekb.eg/article_2005.html}, eprint = {https://ejabf.journals.ekb.eg/article_2005_30747bc715f1287cdbdc6fb59ef3d157.pdf} } @article { author = {Siliem, Nagat}, title = {On survival growth and some physiological parameters of Oreochromis niloticus as afftected by dietary ascorbic acid supplementation}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {73-83}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2006}, abstract = {The present study was carried out to evaluate the effect of adding ascorbic acid to Tilapia fish diets on survival, growth, physiological parameters and total production. O. niloticus at average initial body weight 20.3+0.9g and length13.5+0.6cm, were stocked in concrete ponds at a rate of 5 fish/ m3, and offered a diet of 5% of body weight, six days weekly , twice daily . The basal diet contained 30% crude protein divided into five tested diets. Ascorbic acid wasadded to the basal diet at different levels, 0 , 300, 600, 900 and 1200 mg AA /kgdiet.The results show that tilapia growth performance indices (FBW, A.DG,SGR, GR and FCR) were increased with increasing ascorbic acid (AA) levels.Diet contained 900mg/kg recorded the best value, compared to the control diet.recorded from diet (4) compared to the control diet. Survival and production were increased with the increase of ascorbic acid level until 900mg/kg dietwhich recorded the best results.Similar results were obtained in blood properties (Erythrocyte,hematocrit and hemoglobin) as values showed the same pattern;, fish groups offered diet contained 900mg AA/kg had the best results comparing to the control diet; muscles, serum lipid values decreased with increasing A.A level.Protein content showed best values in fish fed A A up to 900mg/kg diet.The observation on fish growth and health showed that Ascorbic Acid  can be used as a commercial compound to reduce production costs and toincrease total final profit.}, keywords = {Oreochromis niloticus,ascorbic acid,growth parameters,physiological,properties}, url = {https://ejabf.journals.ekb.eg/article_2006.html}, eprint = {https://ejabf.journals.ekb.eg/article_2006_aa5fdcbb3da73a6a177d21dbe09ac3ad.pdf} } @article { author = {Shams El Din, Nihal and Abel Halim, Ahmed}, title = {Changes in phytoplankton community structure at three touristic sites at western Alexandria Beach.}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {85-118}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2007}, abstract = {he phytoplankton abundance, chlorophyll-a and diversity cycle in the Mediterranean sea water, west of Alexandria (Naubaria, reference site), El Mohandessin, Marakia and Marabella tourism villages were studied during theperivd from March 2005 to Jan. 2006 and the results were discussed in relation to some environmental physico-chemical parameters. A total of 208 taxa were recorded in the study area and characterized by different ecological affinitiesextending from typical marine forms (107 taxa), to freshwater euryhaline forms (101 taxa). The Naubaria site was the most diversified community (176 taxa) followed by El Mohandessin village site (90 taxa), Marakia village site (83 taxa)and Marabella village site (54 taxa). Bacillariophyceae was the predominant group in the study area except in Marabella village site, where Chlorophyceae was predominant in September (99.53%). Few species were responsible forabundance peaks, namely: Cyclotella kütziginiana, Rhizosolenia fragellissima (July), Rhizosolenia setigera (September), Skeletonema costatum (November) in Naubaria site; Skeletonema costatum (November) in El Mohandessin site;Rhizosolenia setigera (September) in Mrakia site; Carteria sp. (September) in Marabella site. Chlorophyll-a varied greatly from an average of 0.77 μg/L at Marabella site to 2.66 μg/L at Naubaria site, classifying Naubaria and El-Mohandessin sites between mesotrophic to oligotrophic status and Marakia and Marabella sites as oligotrophic. Species diversity had a negative effect on phytoplankton abundance, ranging between 0.53 and 2.99 nats at Naubaria site,0.13 and 2.39 nats at El Mohandessin site, 0.56 and 2.54 nats at Marakia site,and between 0.03 and 2.79 nats at Marabella site. The blooms of few dominant species were accompanied with low diversity under the prevailing ecologicalconditions reflecting the effect of wastewater effluents discharged in Naubaria, El-Mohandessin and Marabella sites. Thus, they should be kept under investigation to control pollution, whereas the co-dominance of several species,accompanied with low nutrient concentrations at Marakia village site suggests free conditions.}, keywords = {phytoplankton,Community structure,biodiversity,tourism,alexandria}, url = {https://ejabf.journals.ekb.eg/article_2007.html}, eprint = {https://ejabf.journals.ekb.eg/article_2007_225a632087ebff457c8a44856c59b864.pdf} } @article { author = {Abd-Elnaby, Faiza}, title = {New recorded species of Magelonidae and Maldanidae (Annelida: Polychaeta) from EL-Tina Bay, Mediterranean coast of Egypt.}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {119-141}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2008}, abstract = {Sediment samples were collected from the eastern north coast of the Egyptian Mediterranean Sea, from El-Tina Bay, north Sinai, 31º 33´ 30″ N, 32º 45´22″ E, using Van Veen grab sampler, during June 2008. Twelve polychaetespecies were reported; eleven of them are new records for the first time in the Egyptian water. They affiliated to two families; Magelonidae and Maldanidae,including eight genera; Magelona, Praxillella, Micromaldane, Axiothella,Clymenura, Lumbriclymene, Johnstonia and Euclymene, and one species(Euclymene lumbircoides), that was recorded before by Fauvel (1937) in Alexandria.. A full description is provided for each with more details of thearrangement of setae as well as geographic distribution of the recorded species were discussed.}, keywords = {Annelida,Polychaeta,Maldanidae,Magelonidae,Mediterranean Sea}, url = {https://ejabf.journals.ekb.eg/article_2008.html}, eprint = {https://ejabf.journals.ekb.eg/article_2008_ce6d425e6b5b1653179b3c790d9b6abb.pdf} } @article { author = {Abdel-Hameid, Nassr-Allah}, title = {A protective effect of calcium carbonate against arsenic toxicity on the Nile catfish, larias gariepinus}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {143-163}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2009}, abstract = {The objective of the present study was to test the protective upshot of calcium carbonate against the gifted toxicity of arsenic to the Nile cat-fish (Clarias gariepinus). Enhanced hepatosomatic index (HSI) and reduced gonadosomaticindex (GSI) and intestinal index (ISI) as well as some of the tested blood parameters were recorded for fishes exposed to arsenic spotlight (1/10 & 1/20 LC50). The plasma levels of aspartate aminotransferase (AST), alanineaminotransferase (ALT), total bilirubin, direct bilirubin, total lipids, glucose and total protein were significantly increased in fishes exposed to arsenic toxicity. Likewise, the activities of AST, ALT and lactate dehydrogenase (LDH) in theliver and muscles were radically increased, whereas the total protein and glycogen contents in these organs were significantly abridged following arsenic exposure; this may be an indication of energy expenditure attributable to arsenictoxicity. The histological examinations of the liver and gills renewed arsenicinduceddegenerative changes of these organs. Furthermore, the addition of calcium carbonate as a limiting agent induces reversibility of most of these arsenic – induced changes, especially those of fishes subjected to 1/20 LC50 ofarsenic. Consequently, calcium carbonate could be feasible to be used for the fortification of C. gariepinus in opposition to arsenic toxicity.}, keywords = {Arsenic toxicity,Clarias gariepinus,Calcium Carbonate}, url = {https://ejabf.journals.ekb.eg/article_2009.html}, eprint = {https://ejabf.journals.ekb.eg/article_2009_a0ddd55b53ef264ec3942179311e85ce.pdf} } @article { author = {Ibrahim, Abdalla and Taha, Hoda and El-Naggar, Marwa}, title = {Redescription of the cestode Polyonchobothrium Clarias and its histopathological impact on the stomach of Clarias gariepinus}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {165-174}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2010}, abstract = {This study was designed to redescribe the cestode Polyonchobothrium clarias that has been recovered from the stomach of Clarias gariepinus, in addition to the ultrastructure of the parasite and the histopathological changes of thestomach of Clarias gariepinus infected with this parasite. Samples of C.gariepinus were dissected and examined for parasites and prepared for SEM,while the stomach of the host was prepared for histological observations. Therewere significant differences between normal fish and infected ones, where the stomach of normal fish exhibited continuous mucosal layer with well developed tubules and ducts with little infiltration of lymphocytes, while a remarkabledamage was observed in the mucosal layer of the stomach of the infected fishwith excessive infiltration of lymphocytes in addition to excessive mucous secretion and subsequent fibrosis.This study has provided further information onPolyonchobothrium clarias that can reveal more information about host-parasite relationships, particularly its impact on the host fish.}, keywords = {redescription,ultrastucture,Polyonchobothrium clarias,Clarias gariepinus,histopathology,host-parasite relationship}, url = {https://ejabf.journals.ekb.eg/article_2010.html}, eprint = {https://ejabf.journals.ekb.eg/article_2010_cea59f4d5724c98acacf66cdc04ef2f2.pdf} } @article { author = {Sleem, Setaita and El-Hommossany2, Karem}, title = {Can the freshwater crayfish (Procambarus clarkii) help control schistosomiasis and fascioliasis in Egypt?}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {175-183}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2011}, abstract = {Lab experiments and field survey have been carried out to investigate the impact and the relationship between the exotic crayfish; Procambarus clarkii and Schistosoma and Fasciola vector snails in Egypt. In the Lab, severalspecies of freshwater snails, fish and aquatic plants were reported to serve as food for the freshwater crayfish. In the field, a survey for the crayfish and freshwater snails has been conducted at several irrigation channels in Qalyobiya,Ismailia and Behera governorates, which had been previously surveyed during 1990s. The results of the experimental Lab indicated that the vector snails; Biomphalaria alexandrina, Bulinus truncatus and limnaea natalensis were thepreys of first choice for the crayfish. The field surveys showed high reduction and sometimes complete disappearance of vector snails in irrigation channels, which have been invaded by Procambarus clarkii, while in water courses whichdo not harbor the crayfish, such as El Manayef drain and Fayed canal (West of Suez Canal), high densities of these vector snails were recorded. The present study is providing encouraging indication of the possibleovercoming schistosomiasis and fascioliasis in Egypt by the freshwater crayfish Procombarus clarkii.}, keywords = {Procambarus clarkii,Biomphalaria alexandrina,Bulinus truncatus,Limnaea natalensis,Crayfish,Schistosomiasis,Fascioliasis,Egypt}, url = {https://ejabf.journals.ekb.eg/article_2011.html}, eprint = {https://ejabf.journals.ekb.eg/article_2011_59a0cafddff37849bb1d2f86c985a178.pdf} } @article { author = {Mikhail, Samia and Gergis, Wagdy}, title = {Temperature, salinity and light duration dependence on the growth and cellular carbon and nitrogen contents of the epiphytic diatom,Achnanthes longipes Agardh}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {185-202}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2012}, abstract = {Achnanthes longipes Agardh cells were isolated from glass slides submerged in the Eastern Harbour of Alexandria. Addition of D-600 (10& 25 μM) and EDTA (10-3M) was sufficient to prevent adhesion and aggregation of A. longipes cells and get homogenous free cells inocula for culture experiments. The influence of 52 combinations of salinity (5-40 at 5intervals) and temperature (10o-25oC, at 5oC intervals) under continuous light and 12:12 light/dark cycle on chlorophyll a content, the maximum doubling time, cellular carbon and nitrogen of Achnanthes longipes was examined underconstant light intensity (70-80 μE m -2 S -1). No growth was detected at 5 salinity levels with all temperatures tested, and under the combination of 15oC-10 salinity. Maximum Chl. a content during the exponential phase was almost thesame at the two light regimes (about 1.2 μg ml-1). Based on Chl. a variations by days, A. longipes showed its maximum growth rate and doubling time (1.18 and 0.82 d-1, respectively) at 20oC-30 salinity (continuous light) and 1.6 and 1.11 d-1, respectively at 20oC-25 salinity (light/dark cycle). A rising in temperature from 15oC to 20oC caused about 1.8 fold increases in the doubling time of Chl. a at the two light regimes. The results indicated that Chl. a and carbon proceeded in parallel during the exponential phase under the light regimes, and the increasing in carbon content and Chl. a content accompanied an increasing in temperature. The carbon content was consistently lower in continuous light cultures than inthe corresponding light/dark cultures. No definite trend was found between nitrogen and changed temperature and salinity (continuous light), while nitrogen generally increased with increasing temperature under the light/dark cycle. Themaximum carbon/nitrogen was measured at 25oC with salinity range of 35 - 40,it was about two-fold higher at the light/dark (40.03). The carbon: chlorophyll ratio showed a steady increase by days, and varied considerably with changedtemperature. However, there was no characteristic relation between temperature,growth rate and carbon: chlorophyll.}, keywords = {Achnanthes longipes,diatom,salinity,Temperature,growth rate}, url = {https://ejabf.journals.ekb.eg/article_2012.html}, eprint = {https://ejabf.journals.ekb.eg/article_2012_d108e79fc93e31e608babe872147faf6.pdf} } @article { author = {Mustafa, Omaima and Yousef, Hany and Beltagi, Samir and Nicola, Victoria}, title = {Effect of environmental factors and sex difference on physiological responses of the exotic red swamp crayfish, Procambarus clarkii, in Egypt.}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {203-228}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2013}, abstract = {The current study was conducted to investigate the effect of environmental factors and sex difference on the physiological status of the exotic red swamp crayfish (Procambarus clarkii) in Egypt along four successive seasonsduring the period from 2005 to 2006. Animals were collected from El-Mansourya canal at Giza governorate . Water and sediments were collected from three different aquatic habitats in order to determine the least polluted water quality region for collecting specimens used in the current study . These sites were: El-Mansourya canal (site I), El-Mouhit drain (site II) and Bany Magdoul canal (site III). During the four seasons, measurements of physicochemical characteristics of water and sediments revealed elevated annual concentrations for ammonia, nitrates, nitrites, in addition to high chlorosity in site II and heavy contamination with iron, copper, manganese, zinc and aluminum in site III; whereas site I was the least polluted and possesses the most transparent water with lowest electrical conductivity than the other sites.Lowest water temperature was recorded during winter and the highest one was during summer; while at the same season no wide difference has been found among the three habitats. Biochemical analysis of the main edible parts ofcrayfish inhabiting El-Mansourya canal (site I) revealed that males showed little rise in their muscle water content but females exhibited significant higher lipid content almost the year round. No marked changes were observed in the proteincontent in both sexes. Females also showed more glycogen accumulation in their abdominal muscles but lack statistical significance except during spring . In both sexes, highest levels for water content were reported during winter and for lipid during spring while for glycogen were during autumn . The lowest content for lipid was during autumn and for glycogen during winter for both sexes. The results indicate that seasonal changes in biochemical composition of edibleparts of both sexes could reflect different physiological processes related to sex difference as an expression of animal adaptive response, an ecophysiological adaptation, to habitat quality and environmental conditions along the foursuccessive seasons in Egypt.}, keywords = {Crayfish,Procambarus clarkii,habitat quality,sex difference,seasonalvariations,biochemical parameters}, url = {https://ejabf.journals.ekb.eg/article_2013.html}, eprint = {https://ejabf.journals.ekb.eg/article_2013_de61f4c8e302947a019040b55e6ad9e7.pdf} } @article { author = {Mikhail, Samia}, title = {Dynamics of estuarine phytoplankton assemblages in Mex Bay,Alexandria (Egypt): Influence of salinity gradients}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {231-251}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2014}, abstract = {Mex Bay, west of Alexandria (Egypt) is a large, shallow and turbid coastal plain estuary of socio-economic importance. Along its salinity gradient (3.30 to 39.64), seven sampling stations were chosen to cover the differenthabitats. Regionally, four water masses could be defined; the Mediterranean water mass of salinity >38.5, mixed Mediterranean of 30 to 38.5, diluted of 10 to 30 and drain water mass of salinity <10. Phytoplankton species were grouped into three major types: freshwater, coastal low salinity and euryhaline species. A massive spring bloom characterized the annual production cycle and attributed to Skeletonema costatum. Salinity shares in shaping the structure of diatomdominated communities, and its levels between 30 and 35 seem suitable ecological condition for their growth. A boundary of salinity 3.3-5.1 identified as a critical region for certain freshwater species, mostly cyanophytes.Dinoflagellates existed with salinity above 14.8. Chlorophyll a (average 14.39 μg l-1) reached its maximum in mid summer. Chlorophyll a for cells <20 μm contributed over 65% of the biomass. During the phytoplankton blooms, the >20 μm cells dominated (62.73% of total Chl. a) in May, both fraction size (50.1% and 49.9%, respectively) in July, and the <20 μm cells in September (67.52 %). No significant correlation was found between any chlorophyll a sizefraction and abundances of diatoms, euglenophytes, chlorophytes, and cyanophytes, except for the >20 μm size with dinoflagellate abundances. The distribution patterns of biomass showed relatively high Chl. a (average 15.68 μgl-1, 83.73% <20 μm) at salinity <10; 26.24 μg l-1, 58.76 % <20 μm at salinity 10-30; and decreased values (6.16 μg l-1, 58.5 % <20 μm) and 0.99 μg l-1, 66.06%  <20 μm at salinity between 30-38.5, and > 38.5, respectively.Values of the diversity index fluctuated between 0.34 nats (May) and 2.24 nats (September), linked with species diversity and blooming.}, keywords = {Mex Estuary,phytoplankton,salinity gradients,fractionated chlorophyll a}, url = {https://ejabf.journals.ekb.eg/article_2014.html}, eprint = {https://ejabf.journals.ekb.eg/article_2014_41c99108a07afacde393c5a39febf131.pdf} } @article { author = {Khafagy, Omaima and Sallam, Hawanem and Zelenin, Inessa and Zelenin, Alxander}, title = {Gene Expression of GFP from jellyfish into fish.}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {253-264}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2015}, abstract = {The green-fluorescent protein (GFP) of the jellyfish Aequorea victoria has recently been used as a universal reporter in a broad range of heterologous living cells and organisms. Fertilized eggs of the Carp (Cyprinus carpio) in theperiod of blastodisc formation and up to the fourth division of the cleavage were injected with two plasmids expressing the natural jellyfish GFP and synthetic engineered jellyfish (sGFP) using Microinjection method. Reverse transcriptionPCR products, cloning, sequencing, were analysed. Using universal transcription and translation enhancers with strong promoters, has been showed that GFP signals are detectable in transient expression systems of fish. The engineeredGFP gene sequence gave higher GFP expression in fish than the natural jellyfish GFP sequence. This new tool can be used for studies of gene regulation, signal transduction, development and cell biology in animals and plants.}, keywords = {Gene expression,GFP,jellyfish,Cyprinus carpio,transgenic fish,fluorescent proteins}, url = {https://ejabf.journals.ekb.eg/article_2015.html}, eprint = {https://ejabf.journals.ekb.eg/article_2015_0a25038f56b47c32aa25983f75e34356.pdf} } @article { author = {Mohammad, Samya and El-Shoubaky, Gihan and Madkour, Fedekar}, title = {On the use of dry seaweeds and condensed phytoplankton as diets for the clam Venerupis aurea, Egypt}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {265-273}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2016}, abstract = {One of the most commercially important species of the marine clam Venerupis aurea was fed on dry preparations of seaweeds (Enteromorpha intestinalis and Ulva lactuca) and condensed preparation of phytoplankton.Daily growth rate (DGR) of clams as live wet weight increase was calculated to determine the effect of different diets. Comparing DGR of feeding bivalves with that of control, some variations were recorded. Higher growth over control wasobtained for juvenile Venerupis aurea (3-6 mm) fed on phytoplankton and Enteromorpha intestinalis. For the clam size 6.1-9 mm, the bivalves fed on Enteromorpha intestinalis and Ulva lactuca showed higher growth. The largestclam size (9.1-12 mm) which was fed on the previous diets, failed to attain the same growth as control. So, the differentiation in growth was related to size of clam and also to type of the diet.}, keywords = {bivalves,Venerupis aurea,Enteromorpha intestinalis,Ulva lactuca,phytoplankton}, url = {https://ejabf.journals.ekb.eg/article_2016.html}, eprint = {https://ejabf.journals.ekb.eg/article_2016_d5ad4b83102414683076e07059d78f42.pdf} } @article { author = {Amer, Fawzy and Naguib, Suzan and Abd El-Rahman, Fawzia}, title = {Comparative study on the intestine of Schilbe mystus and Labeo niloticus in correlation with their feeding habits}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {275-309}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2017}, abstract = {The present investigation aims to illustrate the morphological, histological and ultrastructural differences in the intestine of a carnivorous fish, Schilbe mystus and a herbivorous fish, Labeo niloticus, in correlation with their feedinghabits. The histological examination of the mucosa of the intestine of both studied species revealed that it is built up of a simple columnar epithelium that contains goblet cells. Though these, are generally more numerous in the intestineof Schilbe mystus than in that of Labeo niloticus. The ultrastructural investigation of the mucosa of the duodenum and ileum of Schilbe mystus revealed that the enterocytes are tall columnar cells and possess well-developedmicrovilli, numerous mitochondria, microtubules and numerous lipid droplets. The ultrastructural examination of the mucosa of the ileum of Labeo niloticus revealed that the enterocytes are tall columnar and possess well-developedmicrovilli, numerous mitochondria, microtubules, a few endocytotic channels and aggregated chylomicrons. The enterocytes of the rectum of both studied species are tall columnar and are characterized by the presence of short and wellspaced microvilli, a well-developed vesiculotubular system, numerousmicrotubules and mitochondria. In addition, the rectal enterocytes of Schilbe mystus contain endocytotic vesicles. The intestinal muscularis of both studiedspecies is well-developed and built up of unstriated muscle fibres, which are arranged into two layers: an inner circular layer and an outer longitudinal one.The rectal muscularis of both studied species is thicker than that of the rest of theintestine.}, keywords = {Schilbe mystus,Labeo niloticus,Feeding habits,intestine light and,Ultrastructure}, url = {https://ejabf.journals.ekb.eg/article_2017.html}, eprint = {https://ejabf.journals.ekb.eg/article_2017_8de09372842957434d0b92de7ffd2f3b.pdf} } @article { author = {}, title = {دراسات علي تربيه أسماک البلطي النيلي لتقييم تأثير إضافه المنشط الحيوي باسيلس سبتلس علي أداء النمو وبعض المعاملات الفسيولوجيه}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {12}, number = {4}, pages = {1-17}, year = {2008}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2008.2018}, abstract = {}, keywords = {}, url = {https://ejabf.journals.ekb.eg/article_2018.html}, eprint = {https://ejabf.journals.ekb.eg/article_2018_1e0c692117043618245e3a21f71cbfd6.pdf} }