What do you understand by composite fish culture?

(N/A) Composite fish culture is a method of farming five or six species of fish,both indigenous and exotic,together in a single fish pond.
These species are selected such that they do not compete for food among themselves because they have different food habits.
As a result,the food available in all parts of the pond is utilized efficiently.
For example,$Catlas$ are surface feeders,$Rohu$ are middle-zone feeders,and $Mrigals$ and common carps are bottom feeders.