الفهرس 
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Abstract
The influence of sub lethal concentrations of Zinc (4.8 and 9.6 mg/l)and the experimental organochlorine pesticide Tak (1.5 and 3mg/l) individually and in mixture on Nile tilapia (Oreochromis niloticus) for seven and fifteen days were investigated. The results revealed a significant increase ((P 0.05) in liver residual Zinc and Tak than muscle tissue of the studied fish Oreochromis niloticus , accompanied by a disturbance in fish physiological status with significant increase in serum glucose level , cortisol hormone ,cholesterol , triglycerides , urea , creatinine, AST and ALT activities. The results also demonstrated synergistic effect of Zinc and Tak on Oreochromis niloticus fish exposed to the different studied sub lethal concentrations for 15 days.