الفهرس 
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Abstract
The goals of this study was to determine the effects of different water salinity levels and feed additive supplementation on growth rate, survival rate and blood components of juvenile of Nile tilapia, Oreochromis niloticus fry. The results indicate that the interaction between water different salinity and dietary feed additives supplementation was significantly (P<0.001) affected live body weight at the all of the experimental periods. Within each water salinity levels, feed additives supplementation significantly increased live body weight. Survival rate of fish group reared at 10 and 15 ppt were 90.48 and 92.38%, respectively. Survival rate not affected with feed additives. Fish group fed diets supplemented with 3% NaCl recorded the best survival rate.. Serum total protein and its fractions insignificantly affected with the interaction between water salinity and feed additives, while serum glucose concentration significantly (P<0.001) affects. Red blood cells, monocytes cells, neutrophil cells, and lymphocytes insignificantly affected with the interaction between water salinity and feed additives. On the other hand, white blood cells affected significantly (P<0.05). Feed cost, income from body gain and net return increased with feed additives supplemented in fish diets The obtained results indicated that salinity is a key factor in controlling growth of Nile tilapia.