Question

For induced breeding, the fish are kept in:
A. Culture pond
B. Stocking pond
C. Breeding hapa
D. Hatching hapa

Answer 1

By looking at the term ‘induced breeding’, we know that the fish undergoing the process should be kept in a place that is ideal for breeding only. This is generally done in a rectangular enclosure that is held by poles and has fine netting. This helps in maintaining good circulation of water and the fine net prevents the eggs from escaping through the gaps.

Complete answer:
- For induced breeding, the fish are kept in a breeding hapa.
- Induced breeding is a process by which fish are bred through artificial stimulation. Through this process, certain modifications are induced in the fish that eventually yield economic benefits.
- The fish are injected with pituitary hormone or some other synthetic hormone that triggers the release of sperms and eggs.
- Once the fish are injected with the hormone, they are released into breeding hapas.

Breeding hapas are rectangular shaped, box-like enclosures that are supported by bamboo poles on all four corners and contain a mosquito net. They are placed in such a way that 0.3 m of it is above the surface of the water and 0.3 m of it is above the floor of the water body. The hapa is held together by tying the four poles at the top and bottom. The roof of the hapa can either be open or closed with the help of a cloth.

Hence, the correct answer is option (C).

Note: Fish cannot be bred in captivity due to environmental disturbances that can affect the hormones, thereby affecting the timely release of eggs and sperms. Induced breeding provides pure spawns and this method can fulfill the demand of any quantity required. The cost of induced breeding is less than the cost associated with collecting natural spawns.