Please answer this question of biology
Solution:
Ans a) The farming practice shown above is that is that of Composite fish culture.
Ans b) Advantages are as follows:
- Fish do not compete for food
- Food available in different zones is utilized
- Carps consume only aquatic weeds
- Very high yield is obtained.
Ans c) Disadvantage is as follows: Good quality seeds are not available.
Composite Fish Culture System has been explained in detail below:
- 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:-
- Fish do not compete for food
- Food available in different zones is utilized
- Carps consume only aquatic weeds
- Very high yield is obtained
Disadvantages:-
- Many fish breed only in the rainy season so hormonal stimulation has to be given.
- Good quality seeds are not available.