Examples include Catlas (surface feeders), Rohus (middle-zone feeders), Mrigals and Common Carps (bottom feeders), and Grass Carps (weed eaters).

By selecting species such as surface feeders, middle-zone feeders, bottom feeders, and weed eaters, all available food resources in different parts of the pond are efficiently utilized.

The principle is to select fish species with different food habits so that they utilize various parts of the pond and do not compete for food among themselves.

Composite fish culture systems involve the cultivation of multiple fish species in the same environment, often combining local and imported species. This method optimizes resource utilization and increases overall productivity within the fish farming system.

Fish culture is sometimes integrated with rice cultivation by growing fish in the water within paddy fields, providing a symbiotic relationship where fish waste fertilizes the rice plants and the rice field provides habitat and food for the fish.