Whats is composite culture? How is …

Composite Fish Culture System:
Sometimes fish culture is done in combination with rice crops so that fish grow along with paddy in the standing water. Both local & imported varieties of fish can be used in such systems.
In such a system, 5/6 species of fish are selected & reared in a single fish pond. The species are selected on the basis of their feeding habits and  they should not compete for food & should not kill each other in the pond.
Three different varieties are
Surface feeders- Catla
Middle zone- Rohu
Bottom feeders- Mrigals & Carps
Advantages:-

1. Fish do not compete for food.
2. Food available in different zones is utilized.
3. Carps consume only aquatic weeds.
4. Very high yield is obtained.

Disadvantages:-

1. Many fish breed only in the rainy season so hormonal stimulation has to be given.
2. Good quality seeds  are not available.