الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
This study was carried out during 2004/2005 on Nile tilapia fish. Fats or vitamins were added to the brooders diet. BioBuds was added in graded levels to the fingerlings diet to overcome cold stress. This work was evaluated via fish weight, mortality, egg production, economic efficiency, fish body composition and blood analysis. From the obtained results, it could be concluded that Nile tilapia brooders used in hatching could be fed before spawning season a diet containg 25% crude protein and supplemented with 5% of a mixture 1:1 of fish oil and sunflowers oil. This dietary treatment was the best concerning % laying brooders, fry production, profitability, economic efficiency and immunity (high WBCs and % lymphocytes). For overwintering the Nile tilapia fingerlings in tanks, it could not recommend the dietary addition of BioBuds2X for its negative effects on the fish. So, another methods for overwintering must be experimented.