Polyculture is a practice of culturing more than one species of aquatic organism in the same pond. The concept of Polyculture of fish is based on the concept of total utilization of different trophic and spatial niches of a pond in order to obtain maximum fish production per unit area. Combinations of exotic and Chinese carps (bighead, silver and grass carp, common carp) are most common in Polyculture. But in India, IMC (Indian Major Carps) along with exotic & minor carps are also used in case of Polyculture fish farming.