Histopathological effect of acute concentrations of heavy metals such as copper, ferroussulphate were studied. Results revealed extensive histopathological abnormalities in the internal structure of gill and brain of Catlacatla exposed to copper and ferrous sulphate in contrast to that of control fish, showing the severity of heavy metal toxicity.

the present study is related to the histochemical investigations on the changes in the intensity of reactions of axons, acid and neutral mucopolysaccharides, biologically active macromolecules, particularly glycogen and protein component as well as alkaline phosphatase (alpase) and adenosine triphosphatase (atpase) in the cells lining the olfactory epithelium of catla catla . the intense reacti...