Effect of Zinc on the Histopathology of Gill, Liver and Kidney of Fresh Water Catfish, Clarias batrachus (Linn.)

The aim of the present study was to assess the toxic effect of Zinc on the histology of gill, liver and kidney of Clarias batrachus was studied. The fish were exposed to sublethal concentration of 96h LC of zinc sulphate (37.22 mg/L) 50 i.e. 10, 20 and 30 of mg/L ZnSO for 30 and 45 days. The fish exposed to zinc sulphate showed fusion of secondary gill 4 lamellae, mucous secretion, and reduction in length, rupturing of secondary gill lamellae and vacuolization were observed in the gill, enlargement of hepatocytes, necrosis, ruptured hepatocytes, space formation and vacuolization were observed in liver, disintegration of tubules, swelling of glomerulus, tubular necrosis and vacuolization were observed in kidney of Clarias batrachus.