Source: RIVER, Hilsha (ilish) any of the members of the genus Tenualosa of the family Clupeidae, order Clupeiformes. Locally known as Ilish, the fish has been designated as the national fish of Bangladesh. The body is strongly compressed and moderately deep with dorsal and ventral profiles equally convex. In the Barishal & Vola, Chandpur area, the best quality Hilsha fish is available.