An intensive way of farming fishes is the composite fish culture system . In such a system, five or six different species of fishes are grown together in a single fish pond. Fishes with different food habits are chosen, so that they do not compete for food amongst themselves.
For example, Catla feeds on the surface of water, Rohu are middle-zone feeders, Mrigal and Common carp are bottom feeders and Grass carp feeds on weeds. This ensures complete utilization of food resources in the pond. Such a system increases the fish yield.