What is breeding hapa?

It is enclosed like a box made of meshed mosquito net material and erected through bamboo poles fixed in the pond or pool. Generally, the hapa are covered with plain cloth over the top, but breeding hapa has an open top for inserting and removing brood fish. The minimum dimensions of a breeding hapa are 2 x 1.5 x 1 m. The breeding hapa is filled such that there are two male fish for one female fish. Once the eggs get hardened and embryo twitches, the brood fish are removed from that place without harming the eggs.