Studies on the influence of heavy metals on antioxidant system in the tissues of freshwater fish Cyprinus carpio

After the determination of LC50 96 hr values of zinc, cadmium and lead to C.carpio (1.0%, 1.5% and 1.5% respectively). Group of ten fishes were reared in sublethal concentrations of indidual metals (0.5%, 0.1%, 0.15%, 0.20% and 0.25%) for 30 days. Tissues like liver, kidney and muscle were used to estimate the antioxidant enzymes (SOD, CAT, GPx and GST) from the metal treated fishes. The heavy metals were found to cause oxidative stress so that the defensive enzymes were begin to rise the activity levels of the enzymes to neutralize the reactive oxygen species (ROS) under metal toxicity in the fishes.