The advantage of mixed/composite fish culture is that many types of fish can be found in the same pond. Each type of fish obtains its diet from a certain place. When catla comes to the surface of the water and chooses her diet, Rohu takes food from the middle of the pond. Mrigal and common work takes food from the bottom of the pond. There is a fish called gross carp, which eats grass and weeds. In this way, by raising many types of fish with less food. i.e. more profit is obtained from mixed fish farming.