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Abundance and ecological observations of the Black-lip pearl oyster, Pinctada margaritifera (L.) (Bivalvia: Pteriidae), in Red Sea Egyptian Waters |
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Age, growth and mortality of saddled bream, Oblada melanura (linnaeus, 1758) in Abu Qir Bay, Egypt. |
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Alkyltin and Alkyllead compounds in Coastal Water of the Suez Gulf, Egypt |
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Annual cycle curves of heat storage for the Red Sea |
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Antiaflatoxigenic activity of chemical antioxidants (glutathione and glutathione enhancer) on Oreochromis niloticus |
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Antimicrobial characteristics of marine polychaetes collected from Alexandria beaches |
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Biological status and management of Diplodus vulgaris (Geoffroy Saint-Hilaire, 1817) in Abu Qir Bay, Egypt |
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Cage-Associated Wild Fish Assemblages at Tuna Fish Farms in the Gulf of Antalya (Turkey’s Western Mediterranean coast) |
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Catch effort Analysis in Lake Manzalah (Egypt) with reference to Trammel and Seine Net-Operating Boats. |
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Comparative study of the antibacterial activity of Ulva lactuca and Pterocladia capillacea extracts before and after encapsulation in Ca-alginate beads |
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Concentration Level of some Dissolved Trace metals in Mediterranean Coastal water N-W- Egypt. |
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Developmental toxicity of nonylphenol in zebrafish (Danio rerio) embryos |
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Distribution and status of seagrass beds around Hurghada area, Red sea, Egypt |
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Distribution of copper and zinc in Aswan dam reservoir and River Nile water at Aswan, Egypt |
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Distribution patterns of hard and soft corals along the Egyptian Red Sea Coast |
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DNA fingerprinting of some tilapia fish in Suez Canal zone |
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Dynamics of carbohydrate translocation between the above- and underground organs of Phragmites australis (Cav.) Trin. ex Steudel in Lake Burullus, Egypt |
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Ecomicrobiological Study on River Nile at Kafr El-Zayat Industrial Area |
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Effect of exogenous hormonal treatment on growth, survival and mucous cell activity during larval development of Oreochromis niloticus |
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Enrichment of Zinc, Copper, Lead and Nickel in Bottom Sediments from three Environmentally Different Regions off Alexandria, Egypt |
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Estimating and Mapping Chlorophyll-a Concentration as a Function of Environmental Changes in Lake Manzala, Egypt using Landsat 7 ETM+ Image |
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Evaluation of the nutritional status of Nymphaea lotus L. and Pistia stratiotes L. shoots in relation to their utilization as fish and animal feed |
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Evaluation of Trace Metal Concentrations in Sediment Samples from Eastern Mediterranean Coast of Egypt |
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Fisheries biology and management of Diplodus Sargus Sargus (Linnaeus, 1758) in Abu Qir Bay, Egypt |
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Geological and geochemical studies on the underground water characteristics in the area between Marsa Alam and BaraneesRed Sea- Egypt |
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Geophysical seismic investigation using high resolution sub-bottom Profiler in the Eastern Harbour, of Alexandria Egypt |
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Histological and ultrastructural alterations in mullet fries exposed to industrial effluents |
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Human health risk assessment associated with current Egyptian dietary intakes of fish |
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Improving Androgenesis by optimizing conditions of ultraviolet treatment in Nile tilapia, Oreochromis niloticus (L.) Zaki Sharawy1 & 2 1 National institute of Oceanography and Fisheries, P. O. Box 182, Suez, Egypt 2 Institute for Hydrobiology and Fisheries Science, Hamburg University, Olbersweg 24, D-22767 Hamburg, Germany E-mail: [email protected] Received 8th March 2010, Accepted 20th October 2010 Abstract The objectives of the present study were to produce homozygous male in Nile tilapia (Oreochromis. niloticus), where the male is heterogametic, by using UV-irradiation and heat shock treatments. Nile tilapia, O. niloticus brood stock was collected from the Lake Manzala population, Egypt and send to the Institute for Animal Breeding and Genetics, Goettingen, Germany, where this experiment was carried out. Fertilization of ultraviolet (UV) irradiated eggs was carried out by using a dosage of 254 nm at a fixed intensity of 58 mJ/cm2 for different distances between UV-lamp and eggs via a heat-shock (41°C for 5 min started at 4.5 min post-fertilization) of Nile tilapia, O. niloticus with sperm from homozygous O. niloticus males induced by mitotic gynogenesis from the second and the third generations of low and high temperature sensitive selection induced. Treatment of eggs at 5 cm distance before fertilization proved to be sufficient to inactivate egg DNA. The present results showed that for the values of a sex ratio of gynogenetic males was mated with normal females (one male x one female) for control group with a lowest percentage of males (14%) and the highest percentage was 44%. For the experimental treatment groups, the results obtained that, at hatching stage (4 days post-fertilization), survival ranged from 0.57% to 3.50%. Although high survival rates were obtained at the hatching stage, they sharply decreased by the yolk-sac absorption stage and dropped by the swim-up stage (30-150 day post-fertilization). Sex ratio of all the progeny (treated groups) significantly differed from 1:1 while their respective controls did not significantly differ from the expected 1:1 ratio (P>0.05), with exception of one male which produced 14% male progeny. After testing the homozygous of fishes, they will be used to produce subsequent generation of androgenetic strains. This study may indicate successfully inactivated the maternal genome (nuclear DNA) in Nile tilapia eggs at 5 cm distance using UV-irradiation. Keywords: Oreochromis niloticus, monosex, sex ratio, androgenesis, haploidy, diploidy |
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Incorporation of fluoride and boron into surface sediments along the Egyptian Mediterranean coast |
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Level of some major constituents of the Egyptian Mediterranean Coastal waters |
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Light and electron microscopical studies on the development of the neural complex of Ascidia mentula ( müller, 1776) (urochordata – ascidiacea) |
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Modeling of adsorption isotherms of Methylene Blue onto rice husk activated carbon |
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Mothocya Taurıca (Czernıavsky, 1868) Female Redescrıptıon Parasıtızıng on Alosa Fallax from the Black Sea Coasts of Turkey |
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Natural resources, bottom facies, impacts, management plan and recommendations on some islands of the Red Sea, Egypt |
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On some exogonines (polychaeta, syllidae, exogoninae) from the north coast of Egypt |
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Optimum dietary protein level in supplementary feed for Oreochromis niloticus fry reared in net enclosures |
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Optimum growth conditions of three isolated diatom species; Skelatonema costatum, Chaetoceros calcitrans and Detonulla confervacea and their utilization as feed for marine penaeid shrimp larvae |
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Organochlorine pesticides and trace metals contamination in some marketable fish in Egypt |
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Organotin compounds in Egyptian Mediterranean sediments |
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Overview on the effect of tourism development on the coastal zone, of Red Sea, Egypt |
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Pathogenic characteristics and molecular identification of Aeromonas hydrophila isolated from some naturally infected cultured fishes |
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Phytoplankton Community Structure at Some Sites of Marine Origin Fish Fry collection, with special reference to Mugilidae along Mediterranean Coast, Egypt |
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Phytoplankton distribution in the southeastern Mediterranean Sea (Egyptian waters) in summer and winter 2005 |
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Population structure and catch per unit effort (CPUE) in the main stream, Damietta and Rosetta branches of the River Nile, Egypt |
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Radioisotope levels in some recent corals of the northern Red Sea, Egypt |
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Reproductive biology and histological features of female thread fin bream Nemipterus japonicus in Gulf of Suez, Egypt |
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Reproductive strategy of the black lip pearl oyster, Pinctada margaritifera (Linnaeus, 1758) in Red Sea, Egyptian Waters |
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Sedimentological and mineralogical characteristics of khors sediments, Lake Nasser, Egypt |
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Surfactant Concentrations and Physicochemical Characteristics of Alexandria Coastal Water |
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Teratogenic effect of phenolic metabolites on zebrafish (Danio rerio) embryos |
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The biological pump of carbon dioxide in El-Mex bay, Alexandria, Egypt |
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The hydrogeologic connection between Lake Nasser and the Nubian Sandstone aquifer in Toshka area, South Western Desert, Egypt |
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The occurrence and distribution of humic substances and nutrient salts in Alexandria Eastern Harbour (Spring 2004) |
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The role of sediment pore waters in the fertility of Abu Qir Bay, Egypt |
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Ultrastructure features of spermiogenesis and spermatozoa in Diplodus vulgaris (Geoffroy saint-hilaire, 1817) ‘Egypt’. |
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Use of steel slag as a substrate for coral transplantation |
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