@article { author = {Abd El-Hakim, Nabil and Fahim, Ahmed and Al-desoki,, Mohamed}, title = {Effect of dietary replacement of yellow corn energy with culled sweet potato (as non traditional energy source) on growth performance,nutrients utilization and carcass traits of growing Nile Tilapia (Oreochromis niloticus)}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {14}, number = {2}, pages = {1-17}, year = {2010}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2010.2057}, abstract = {The present study aimed to evaluate the effect of incorporation of culled inedible sweet potato root (as non-traditional energy source) to replace yellow corn energy in growing mono-sex Nile tilapia (Oreochromis niloticus)diets on the fish performance, nutrients utilization, whole body composition and carcass traits. The study was carried out in concrete ponds (7.5m length × 2.25m width × 0.70m water depth). Each pond was divided by fine nets into three equal parts (2.5 × 2.25 × 0.70m each) to represent four treatments; the control (CSP0); the 25 (CSP25); 50 (CSP50) and 100% (CSP100) culled sweet potato, respectively. Each dietary treatment was carried out in triplicates and thetreatments were stocked with Nile tilapia fry (0.31 g initial weight) at a rate of 20 fish / m3 i.e. 80 fish in each replicate. The experimental diets were formulated to be iso nitrogenus and iso caloric and contained about 33% crude protein and4500 kcal GE/kg. The experimental diets were fed at daily rates of 30; 10; 6 and 4 % of the fish biomass for fish weight from start to 1g; 1-5g; 5-20g and 20g respectively till the end of the experiment after 22 weeks. The experimental dietswere offered in equal portions at 9am; 11am; 1 pm and 3pm respectively. Results obtained are summarized in the following: 1- Culled sweet potato contained 92.5; 6.1; 1.0; 4.6; 3.87 and 76.93 % dry mater;crude protein; crude fat; ash; crude fiber and NFE, respectively. It contained3671 kcal growth energy / kg.2- Incorporation of culled sweet potato to replace 100% of yellow corn energyimproved significantly final weight and weight gain compared to the 25 CSP andthe control group. Replacement of yellow corn energy with CSP at all testedlevels released no significant effects on condition factor and survival rate.3- Incorporation of CSP at 50 and 100 % levels to replace yellow corn energy inNile tilapia diets showed similar insignificant feed conversion ratio compared tothe control group, however both levels improved significantly the proteinefficiency ratio compared to the 25% replacement level. CSP at all tested levelshad no significant effects on energy utilization compared to the control group. 4- Incorporation of CSP released significant effects on dressing; head; byproductsand flesh percentages compared to the control group.5- Replacement of yellow corn energy with CSP at 25; 50 and 100% levels hadno significant effects on whole body chemical composition.6- Replacement of yellow corn energy with CSP energy reduced the costs of onekg gain in weight by 4.67 and 1.24% for the CSP50 and CSP100 compared tothe control group, respectively; while CSP at 25% level increased the productioncosts of one kg gain in weight by 5.72 % compared to the control group.Based on the obtained results, it could be concluded that culled sweetpotato can replace 50 to 100% of yellow corn energy without adverse effects ongrowth performance, feed utilization parameters with the advantage of reducingthe costs of 1000 Kg gross energy.}, keywords = {Nile tilapia,Oreochromis niloticus,yellow corn,Sweet potato,Nutrients,Growth}, url = {https://ejabf.journals.ekb.eg/article_2057.html}, eprint = {https://ejabf.journals.ekb.eg/article_2057_1c0c37707255d52828ea045c7be8b59d.pdf} } @article { author = {Abdel-Hakim, Nabil and Lashin, Mohamed and Ashry, Ahmed and Al-Azab, AL-Desoki}, title = {Effect of fresh or dried garlic as a natural feed supplement on growth performance and nutrients utilization of the Nile Tilapia (Oreochromis niloticas)}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {14}, number = {2}, pages = {19-38}, year = {2010}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2010.2058}, abstract = {he present investigation aimed to study the effect of dietary fresh or dried garlic (Allium sativum) supplementation in the Nile tilapia (Oreochromis niloticus) diets at different levels, on growth performance, nutrients utilization,carcass traits and whole bodies' chemical composition. The study was performed in four concrete ponds (7.5 × 2.25 × 0.70 m). All experimental ponds were divided into four partitions with a water volume of each partition of 3 m3 (1.875 × 2.25 × 0.70 m). The experiment included five dietary treatments i.e the control (C); treatment 2 fed on the basal diet supplemented with 5g. fresh garlic/kg diet (FG5); treatment 3 supplemented with fresh garlic at 3g/kg (FG3) and treatments 4 and 5 supplemented with dried garlic at levels of 5 and 3g/kg (DG5) and (DG3), respectively. Fresh and dried garlic were supplemented to the basal diet and mixed with the basal diet thoroughly. Each dietary treatment was applied in triplicates and stocked with healthy mono-sex Nile tilapia fry (0.26g initial weight) at a rate of 60 fry each replicate i.e 20 fry / m3. The basal diet was formulated to contain about 33% crud protein and 4500 kcal gross energy. The experimental diets were fed at daily rates of 30; 10; 6 and 4% of the fish biomassfor fish weights from 0.26 to 1g; 1-5g; 5-20g and 20g till the end of the experiment after 22 weeks, respectively. The experimental diets were offered daily in equal parts at 9am; 11am; 1pm and 3pm, respectively.Results obtained are summarized in the following:1- The highest (P<0.05) final weights (90.02g); total weight gain (89.76g); dailyweight gain (0.58g); specific growth rate (3.81) and survival rate 93.89% wererecorded with the group fed on the basal diet supplemented with fresh garlic at3g/kg level, while the lowest value (P<0.05) was recorded by the control unsupplementedgroup. All garlic supplemented groups recorded significantlyhigher condition factor compared to the control group.2- The group fed on the diet supplemented with dried garlic (5g/kg) recordedsignificantly the best feed conversion ratio; protein efficiency ratio and proteinproductive value; while the control group recorded the worst value of the testedfeed utilization parameters.3- Garlic supplementation of Nile tilapia diets released significant effects ondressing percentages for the favor of dried garlic at levels 5 and 3g/kg while the  control group recorded the lowest (P<0.05) value, garlic supplementationshowed significant effects on by-products; flesh percentages and hepato somaticindex.4- Supplementation of Nile tilapia diets with fresh or dried garlic had nosignificant effects on moisture; dry matter and ash contents of fish whole bodies,while it released significant effects on the whole body protein and fat comparedto the control group.5- Dietary fresh or dried garlic supplementation showed significant effects ontilapia serum total protein; total albumen; total globulin and total lipids.6- Supplementing Nile tilapia diets with fresh garlic at levels of 5 or 3g/kg anddried garlic at levels of 5 or 3g/kg reduced the costs of production one kg of fishgain by 6.39; 6.02; 9.72 and 6.05% compared to the control group, respectively.Based on the present results, supplementation of growing Nile tilapia dietswith dried garlic at 5g/kg diet level is recommended to achieve better growthperformance; feed utilization and to reduce the costs of production of onekg/gain in weight.}, keywords = {Nile tilapia,Natural feed additives,tank culture,Garlic}, url = {https://ejabf.journals.ekb.eg/article_2058.html}, eprint = {https://ejabf.journals.ekb.eg/article_2058_e494df2cf92fac3276adc7fa7cd18e0a.pdf} } @article { author = {Sallam, Wafaa and Gab-Alla, Ali}, title = {Some biological aspects of the portunid crab Charybdis natator from the Gulf of Suez, Red sea}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {14}, number = {2}, pages = {39-51}, year = {2010}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2010.2059}, abstract = {The population of the portunid crab Charybdis natator in the Gulf of Suez,Red Sea was studied by monthly sampling from September 2007 to May 2008. Crabs were sexed, measured and berried females recorded. A total of 498individuals were obtained, of which 232 (46.6%) were males, 212 non-ovigerous females (42.5%), and 54 (10.9%) ovigerous females. The overall sex ratio (M:F) was (1:1.1) and females outnumbered females during September-November. The population showed sex differences in the size frequency distributions, with males reaching larger size than females (70-148.4mm and 47.5-130.5mm CW, respectively). Ovigerous females existed all year round and ranged in size between 83-118.4mm CW. Fecundity ranged from 45230 to 335529 eggs per female and was positively correlated with body size. The effectiveness of the closed season that runs in the Gulf of Suez on the population of C. natator wasdiscussed.}, keywords = {Charybdis natator,portunid crab,Red Sea}, url = {https://ejabf.journals.ekb.eg/article_2059.html}, eprint = {https://ejabf.journals.ekb.eg/article_2059_aedf6f3e899bf012ac8bc06de27feb8d.pdf} } @article { author = {Goda, Ashraf and Mohamed, Wafaa and Hebalah, Shaimaa and El-Bermawey, Nagy}, title = {Influence of different dietary protein levels and feeding frequencies on growth performance and feed utilization of the Giant freshwater prawn, Macrobrachium rosenbergii with the Nile tilapia, Oreochromus niloticus in polyculture}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {14}, number = {2}, pages = {53-67}, year = {2010}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2010.2061}, abstract = {An 84-day experiment was conducted to investigate the effects of two dietary protein levels 30 & 35% CP & three feeding frequencies 2, 3 & 4 times a day (8:0 and 11.0 h), (8.0, 11.0 and 14.0 h) and (8.0, 11.0, 14.0 and 17.0 h) ongrowth performance and feed utilization of the freshwater prawn, Macrobrachium rosenbergii with the Nile tilapia, Oreochromuis niloticus fry in a polyculture system. The experiment was conducted in small-scale hapas, 3.75m-3 each in triplicates. Irrespective of polyculture system, prawn PL fed diet containing 35% CP 4 times a day had significant (P≤0.05) the highest final body weight (FBW), weight gain (WG), specific growth rate(SGR) and best feedconversion ratio (FCR) values among all treatments. Meanwhile, the Nile tilapia fed on diet containing 35% CP at 2 times/day recorded the highest significant FBW, WG, and best FCR among all treatments. The highest significant totalbiomass weight (kg hapa-1), and gain (kg hapa-1) and feed consumption (kg hapa- 1) were obtained for prawn and tilapia feed the diet containing 35% protein. No significant differences (P≤0.05) were observed for SGR, FCR and S among all experimental hapas. The same trend was recorded for the different feedingfrequencies. The highest values of the whole body CP, EE, ash and gross energy content were recorded for prawn fed on 30% diet at twice per day. No clear trend was observed for body composition of the Nile tilapia fry except for thehighest lipid content (P ≤ 0.05) recorded for the fish fed on 30% CP diet 2 times per day. The findings of the current trials revealed that, feeding frequency has a great effect on growth performance and feed utilization efficiency of thefreshwater prawn M. rosenbergii PL and the Nile tilapia fry. Feeding frequency 4 times per day for M. rosenbergii PL either 2 or 3 times per day for Nile tilapia fry is recommended under similar rearing condition to achieve best performance for both animals.}, keywords = {Dietary protein,feeding frequency,Macrobrachium rosenbergii,Oreochromus niloticus,fish performance,polyculture}, url = {https://ejabf.journals.ekb.eg/article_2061.html}, eprint = {https://ejabf.journals.ekb.eg/article_2061_9ba12d5d4a60c4aa64b9c778d4619b4e.pdf} } @article { author = {Yousif, Fouad and El Bardicy, Samia and Ibrahim, Abdalla and Sleem, Setaita}, title = {Impact of the freshwater operculate snail Melanoides tuberculata on Survival and Egg Production of the planorbid snail Bulinus truncates and on its transmission of Schistosoma haematobium Infection}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {14}, number = {2}, pages = {69-78}, year = {2010}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2010.2062}, abstract = {The biological control of vector snails is an essential component in the fight against schistosomiasis. Melanoides tuberculata (Thiaridae: Prosobranchia) was evaluated experimentally for its impact on the survival, egg production, ofBulinus truncatus, and its infection rate and cercarial production of Schistosoma haematobium. M. tuberculata has been proved to have a considerably negative effect on the survival and egg production of B. truncatus. The results show alsothat this suppressive effect becomes much higher as the relative density of Melanoides to Bulinus snails was increased. Besides, this was associated with considerable decline of Bulinus egg production.The rate of infection of Bulinus snails with S. haematobium was found to be significantly reduced by the presence of Melanoides during miracidial exposure of snails. The same was also observed if Melanoides was maintainedwith miracidially exposed Bulinus throughout its life span. The rate of infection of Bulinus with S. haematobium and the cercarial production was much reduced in comparison with the control group and therefore the total periodic cercarialproduction was reduced by 78.2%. The effects of Melanoides are additive and thus could lead to considerable depression in schistosomiasis transmission. This supports the utilization of Melanoides in the biocontrol of schistosomiasis inEgypt.}, keywords = {Melanoides tuberculata,Bulinus truncatus,Infection,Schistosoma,haematobium}, url = {https://ejabf.journals.ekb.eg/article_2062.html}, eprint = {https://ejabf.journals.ekb.eg/article_2062_25382ca8abf9d0abe940ace1574d4afc.pdf} } @article { author = {Gab-Alla, Ali and Fouda, Moustafa and Morsy, Waleed}, title = {Ecology of Avicennia marina mangals along Gulf of Aqaba, South Sinai, Red Sea}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {14}, number = {2}, pages = {79-93}, year = {2010}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2010.2063}, abstract = {This study was conducted on a naturally growing mangrove population at Ras Mohammed and Nabq protected areas, South Sinai, during the period 2005- 2006. Avicennia marina is the only growing mangrove species in South Sinai. Itsstructure, litterfall and seedling distribution were investigated. The total area ofmangrove stands is 99.1 hectares with 42% canopy coverage, average tree height is between 1.7 - 2.6 m, basal area up to 9.2 m2. ha-1. Ras Mohammed represents the densest stand (428 stems ha-1). An annual litterfall of 2036.7 Kg. ha-1. yr-1was recorded at Rowaiseya with a maximum peak during April. Mangroves at Nabq area have well distribution of seedlings over Abu Zabad site and a localized dense aggregation of seedlings in intertidal areas at Monqataa andGharqana sites with a seedling density up to 1848 ha-1.}, keywords = {Avicennia marina,grey mangrove,litterfall,sediment analysis,Seedling,density,South Sinai}, url = {https://ejabf.journals.ekb.eg/article_2063.html}, eprint = {https://ejabf.journals.ekb.eg/article_2063_ded9af4320d90289ac713d626ccd1e40.pdf} } @article { author = {Madkour, Fedekar and El-Sherbiny, Mohsen and Aamer, Maher}, title = {Phytoplankton population along certain Egyptian coastal regions of the Red Sea}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {14}, number = {2}, pages = {95-109}, year = {2010}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2010.2064}, abstract = {Surface phytoplankton samples were collected at eight sites along certain Egyptian coasts of the Red Sea located at the southern of Sinai Peninsula and the two gulfs (Gulf of Suez and Gulf of Aqaba). Qualitative and quantitativeestimation of phytoplankton species were conducted seasonally during the period from autumn 2007 to summer 2008. The phytoplankton population was fairly diversified (181 species) comprised mainly two groups; dinoflagellates(116 species) and diatoms (60 species). The dominant genera, in terms of the number of species, were Ceratium, Protoperidinium, Dinophysis and Gonyaulax for dinoflagellates, while Chaetoceros, Rhizosolenia and Nitzschia for diatoms.The phytoplankton standing crop was relatively low with and average seasonal density of 1.4-7.7×103 individual/l, reflecting the oligotrophic conditions of this area. The phytoplankton abundance showed one peak in summer whenHemiaulus hauckii (9×103 individual/l) from diatoms and Trichodesmium spp. (3×103 individual/l) from blue-green algae comprised the main bulk of the phytoplankton standing crop. Relatively high production of different speciesappeared at different sites during specific season, such as Nitzschia closterium,Pseudo-nitzschia delicatissima, Rhizosolenia alata and R. calcar-avis. On the other hand, there were relatively low variations in phytoplankton composition the along study area. Spatial distribution of phytoplankton showed that Gulf ofSuez differes in the dominant species and timing of abundance from both Gulf ofAqaba and the southern sites of Sinai Peninsula.}, keywords = {phytoplankton,species composition,Gulf of Suez,Gulf of Aqaba,Red Sea}, url = {https://ejabf.journals.ekb.eg/article_2064.html}, eprint = {https://ejabf.journals.ekb.eg/article_2064_dd1e7c6bcce3e940c99ef2cd569ef1bb.pdf} } @article { author = {Kilada, Raouf}, title = {Validated age and growth estimates of two clam species in a saltwater lake on the Suez Canal in Egypt}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {14}, number = {2}, pages = {111-126}, year = {2010}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2010.2066}, abstract = {This is the first time to document the validated age and growth estimates for two clam species; Ruditapes decussatus, and Gafrarium pectinatum in Lake Timsah, which is a salt water lake on the Suez Canal in Egypt. Age validationfor the two species was done to confirm the annual deposition of each growth increments on the shell surface and was conducted using the edge analysis method. Age validation of these two species showed that the period of the majorgrowth was summer, while the slower growth was documented in winter. The age of the two species was determined by counting the growth increments on the shell surface. Maximum age for R. decussatus (4 y) and G. pectinatum (3 y)were recorded in a 37.2 mm and 42.1 mm in the two species, respectively. Also, length frequency analysis using FiSAT was used to confirm the number of year classes (age) in the two species. The von Bertalanffy Growth Parameters; L∞, kand to, were 40.4 mm, 0.268 and -1.11y for R. decussatus and 36.3 mm, 0.81 and 0.05 y for G. pectinatum. Besides age, the morphometric characters of the two species were discussed. The results of this study will help in better fisheries and ecosystem management.}, keywords = {}, url = {https://ejabf.journals.ekb.eg/article_2066.html}, eprint = {https://ejabf.journals.ekb.eg/article_2066_abf7c0617e5cc6d7f779158c1278bcb0.pdf} } @article { author = {}, title = {أثر استبدال الذره الصفراء بناتج فرز جذور البطاطا کمصدر غير تقليدي للطاقه علي أداء النمو والکفاءه الغذائيه وکذلک الصفات العامه لأسماک البلطي النيلي}, journal = {Egyptian Journal of Aquatic Biology and Fisheries}, volume = {14}, number = {2}, pages = {1-7}, year = {2010}, publisher = {The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)}, issn = {1110-6131}, eissn = {2536-9814}, doi = {10.21608/ejabf.2010.2067}, abstract = {}, keywords = {}, url = {https://ejabf.journals.ekb.eg/article_2067.html}, eprint = {https://ejabf.journals.ekb.eg/article_2067_5543c515478841a7678f20eade606f43.pdf} }