الفهرس 
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Abstract
ABSTRACT The present study was conducted to evaluate the effect of antioxidants (vitamin C, vitamin E and Selenium) added to the basal diet on some blood parameters and growth performance of Nile tilapia (Oreochromis niloticus). Basal diet (25% protein) was formulated as control. The experiment design included 8 treatments in duplicates Antioxidants were added to the basal diet as follow (1- control (basal diet), 2-basal diet+ vit C, 3-basal diet+ Vit E, 4-basal diet + Se, 5-basal diet + vitamins C& E, 6-basal diet +vitamins C &Se, 7-basal diet +vitamins E& Se and 8-basal diet + vitamins C, E &Se). A number of480 adult male tilapia with an average initial weight of 164.78±13gm were randomly raised in 16 fiberglass tanks (5m3 each) in 8 treatments as duplicate ( 30 fish /tank) under laboratory conditions and fed the experimental diets daily at 3% body weight. After 4 months of the experiment, the fish fed vitamins C, E and C&E supplemented diets had significantly (p<0.05) higher final weight, daily gain in weight, specific growth rate and condition factor than other feeds, whereas the diet 4 (supplemented with Se) showed the poorest performance WG and SGR. Results of the present study suggest that diet supplemented with antioxidants produce the best growth response in Oreochromis niloticus .Hematological indices (red blood cells count, Hb, Hematocrit, , white blood cell count) showed a significant increase (p< 0.05) with dietary vitamins C and E. The results showed that vitamin E is limiting factor in improving fish growth and blood parameters.