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:

  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.

Ans c) Disadvantage is as follows: Good quality seeds are not available.
 


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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.

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