Toxicity of the heavy metal in the fish, cyprinus carpio on exposed to municipal sewage water

This investigation examines uptake of heavy metals, Zinc and Nickel in the tissues of the fish, Cyprinus carpio exposed to lethal and sublethal concentrations of Singanallur waste water for 3,10 & 20 days. The concentration of zinc varied from 0.29mg / gm to 0.72mg / gm (Liver), 0.56mg / gm to 0.58mg / gm (Kidney), 0.33mg / gm to 0.52mg / gm (Muscle) and Nickel concentration was varied from 0.54mg / gm to 1.60mg / gm (Liver), 10.81mg / gm to 3.63mg / gm (Kidney) and 0.75mg / gm to 1.31mg / gm (Muscle). Accumulation of Zinc was increased progressively on 3,10 & 20 days in the following order: Muscle> Kidney>Liver. In the case of nickel the order was: Liver>Muscle>Kidney. Zinc and Nickel were found to be toxic to the fish, which will biomagnify up the foodchain and will ultimately be toxic to human beings.