EFFECT OF POLLUTION ON ANTIOXIDANT DEFENSE IN VARIOUS TISSUES OF SCALE CARP,

This study was carried out to assess the status of oxidative stress and antioxidant defense in various tissues of fresh water scale carp, Cyprinus carpio communis (Lin.) living in a hyper-eutrophic urban Edulabad water reservoir system, which is being polluted from industrial, domestic and sewage effluents. The seasonal effects of environmental pollution on antioxidant responses in liver, kidney and gills of the fish were studied. The results obtained in present study indicated the increase in oxidative stress in gills, liver and kidney when compared to that of Bibi Nagar water reservoir, which is fresh water reservoir system with lesser contaminants. Further, increased reactive oxygen species and lipid peroxidation with sequence of liver gill kidney was observed. However, the decreased GSH and GSH/GSSG with sequence of gill liver kidney. The decreased GSH/GSSG in all tissues indicated the oxidized thiol status in fish living in polluted water. All these changes were in the order of pre-monsoon monsoon post-monsoon season. The present study indicates that the presence of pollutants in Edulabad water reservoir might be affecting aquatic life through enhancing the oxidative stress in the fish. Further, the tissue specific responses in fish adaptation are seasonally variable by environmental pollution