The present work deals the histopathological study of fresh water fish Channa striatus infected with cestode parasite Senga sp. The study reveals the mechanical damage cause by the parasite to the intestinal tissue of the fish which which includes shortening and damaging villi, thickening of the muscle layer, destruction of the villi, hold fast penetration of the mucosa and the damage of both the mucous and submucous membranes as compared with the normal intestinal tissue.
