HISTOPATHOLOGICAL CHANGES IN THE GILL OF FRESHWATER TELEOST HETEROPNEUSTES FOSSILIS (BLOCH) EXPOSED TO METANIL YELLOW

The chronic toxic effect of Metanil Yellow on the gills of freshwater teleost Heteropneustes fossilis (Bloch) was studied. The ?shes were exposed for 45 days treatment in 2g/L of Metanil Yellow. However, after 45 days treatment, marked pathological changes in the gills were found. Necrosis found in the primary gill lamellae. Shortened and clubbing ends of the secondary gill lamellae. Buldging tip of primary gill ?laments and distortion was occurred in the shape of secondary ?lament. Pycnotic nuclei, vacuolization and degenerative epithelial cells were found