Experience in Artificial Propagation of Koi Carp

1. The time of artificial induction of brocade carp is about 25 ℃. The second pectoral fin injection method can be used, and the effective drugs for promoting estrus are chorionic gonadotropin, luteinizing hormone-releasing hormone analogues, diosterone and so on.

2. Artificial insemination in the breeding season, put the male and female parent fish in the same pool, put an appropriate amount of fish nest, add some new water, and then pay attention to observation. When the male is found to be chasing the female fiercely. It shows that the female and male parent fish are about to spawn and ejaculate, at this time, the female and male parent fish are scooped up in a washbasin and put on a white enamel plate to gently press the abdomen of the female and male parent fish. If mature eggs or milky white semen flow out of the reproductive pores respectively, it shows that they are mature. After the male and female parent fish are ready, artificial insemination can be carried out. First take the female fish, dry the fish body with a towel or gauze, one person gently grips the tail handle with his left hand, so that it cannot swing left and right, hold the fish head lightly with the right hand, and the other gently presses the female fish's abdomen with the right thumb from the front of the ovary at the pectoral fin, that is, eggs flow from the reproductive hole into the white enamel basin that is disinfected and washed in advance, and are squeezed several times until they are basically emptied. Then use the same method to treat the male fish, quickly squeeze the semen into the egg basin and add a certain amount of isothermal fresh water. Then gently mix the sperm and eggs with clean feathers, mix them fully and fertilize quickly. 3. Hatching will disinfect, wash and inject hatching water, that is, pollution-free river water, well water, tap water and so on. Put into the sterilized fish nest when the water temperature is close to that of the spawning water. Generally, there are 6 fish nests per square meter with a water depth of 25 centimeters. If the hatched larvae are cultivated in this container before the larvae are young, the nest density should be reduced to 3 fish nests. The incubation time is closely related to the water temperature. It takes 5-7 days when the water temperature is 18 ℃, 3-4 days when the water temperature is 22 ℃, and 2-3 days when the water temperature is 25%. The water temperature is generally controlled within the optimum range of 18-24 ℃, the hatching time is controlled within 3-4 days, the hatching rate is more than 90%, the hatched larvae are in the best physique, and the number of high-quality fish is the largest.