Breeding techniques of grass carp

Grass carp reproduce in a manner similar to that of several other domestic fish, so grass carp are often mixed with silver carp, bighead carp and herring. The breeding techniques of grass carp mainly include: spawning site, breeding period and spawning mode.

Spawning site

Because grass carp can not spawn in still water, the spawning site is generally chosen in the confluence of the main stream of the river, the deep trough on the side of the river bend, and the section of the river that suddenly tightens on both sides.

Breeding period

The breeding period of grass carp is similar to that of silver carp and earlier than that of herring and bighead carp. The reproductive period is from April to July, mostly in May. When the water temperature is stable at about 18 ℃, grass carp will spawn on a large scale.

Spawning mode

Grass carp usually spawn in the water layer, and the fish body does not surface, which is commonly known as "stifling", but when there are good reproductive ecological conditions, such as a sharp rise in water level and thunderstorm, female and male fish chase in the upper layer of the water. there is a "floating row" phenomenon of abdominal shivering. After fertilization, due to the swelling of the egg membrane, the diameter of the egg can reach about 5 mm, drift along the water, develop best at about 20 ℃, and hatch fish fry in about 30-40 hours.