In this paper the Mechanical gushing containing substantial metals, on entering oceanic climate causes biochemical unsettling influences in the fish. Hefty metals furthermore, their salts comprise a significant gathering of ecological contaminations since they are powerful metabolic inhibitors. The inalienable harmfulness of a metal relies on its ability to upset the dynamic life measures in natural framework by consolidating with cell organelles, macromolecules and metabolites. The perseverance and pervasive nature of these poison mixes combined with their inclination to collect in living beings eventually produce harmful response in oceanic biota particularly, fish. The persistence and ubiquitous nature of pollutant compound coupled with their tendency to accumulate in organisms ultimately procedure toxic reaction in aquatic biota especially, Fish. In this paper the effects of heavy metal on the gills of clarias batrachus is demonstrated, clarias batrachus, a freshwater teleost were exposed to copper sulphate for 24, 48 72 are 96h at 0.25, 0.30 and 0.40ppm to determine the LC₅₀ values as well as any histopathological to the Gills.