الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
3 experiments were designed on 310 tilapia nilotica fingerling with average body weight 25 ± 5 gm / fish to study the influence of environmental changes as different level of salinity , different degree of temperature and different stocking density on the care of tilapia nilotica and effects on the health and growth was investigated result obtained under experiment condition mentioned could be summarized in the following :3 ‰ salinity was most favorable for survival and growth of tilapia nilotica Tilapia nilotica showed high survival rate (97 % ) when temperature was 20°C while Influence of fish density on livability of tilapia nilotica under surface and forced aeration. There was cooperation between D.O. level and fish density in case of surface aeration .result obtained revealed that Aquarian supplied with at least 1.5 mg / liter D.O The best growth rate and higher food conversion efficiency (0.71, 21.94) respectively were achieved at lowest density eaten 10 fish / m3 and these parameters were gradually decreased as density rat increase to 30 fish/m3.