SEASONAL VARIATIONS OF ANTIOXIDANT ENZYME ACTIVITIES IN T.ZILLII FISH CAUGHT FROM LAKEQARUN.

Lake Qarunis exposed to high inputs of agricultural drainage water, sewage and industrial wastewater through a system of twelve drains which influence the living organisms like fish. In the present study, antioxidant enzymes were chosen as bioindicators for pollution in lakeQarun. Fish samples, T.zillii were collected from Lake Qarun seasonally during (August 2014 to May 2015) to determine the changes in the activities of antioxidant defense enzymes (SOD and CAT) in the liver as well as performing meat quality of the collected fish through analysis of total proteins and total lipids in muscles. The present results showed that SOD activity in the liver of T. zilliifish collected from eastern and middle part of the lake was increased significantly (p?0.05) compared to the control value seasonallywhile, samples of the western part of the lake increased insignificantly in summer, autumn and winter season. Catalase activity in the liver of T. zilliifish collectedfrom the eastern and middle part of the lake increased significantly compared with control value (p?0.05) in summer, autumn and spring. The levels of total protein in the muscle decreased significantly (p?0.05) reaching its minimum value in the muscle of fish from the eastern part of the lake. Total lipid content in the muscle was increased significantly (p?0.05) reaching its maximum value in the muscle of fish from the eastern part of the lake. It was concluded that pollution of the lake adversely affect enzymatic activities, physiological functions and meat quality of fish.