After the mature male and female loach with better maturity is selected, artificial oxytocin production can be performed. The oxytocin drugs use human chorionic gonadotropin (HCG). The female dose is 20-40 international units per gram of body weight, and the male fish is halved. The injection method is a single injection of the dorsal fin base muscle. The ratio of male to female is generally 1:2 or 1:3. The injection time is usually chosen at 7-8 pm. After the injection, the fish is placed in a hatchery or cage in which a fish nest (made of water grass) is hung. When the water temperature is about 25°C, the fish can be estrus 12 hours after the injection. At this time, artificial eggs can be fertilized. First, the male fish are squeezed out of the broth, and then the eggs are squeezed into the vessel, and gently stirred with a feather. After washing with water, the fertilized eggs are lightly sprinkled on the fish nest. Do not move the fish easily. nest.

Incubation places nests of eggs with fish in the pool at a suitable density. If it is a still water pond, it needs to be inflated to ensure sufficient dissolved oxygen for hatching. The amount of aeration is related to the density of the ovum. For example, if the density of the nest is relatively thin, and the quality of the eggs is good, then the amount of aeration is small. On the contrary, the amount of aeration needs to be large. When the water temperature is around 25°C, the membrane can be hatched in about 30 hours. Under careful management, the hatching rate is generally about 80%. Three days after the larvae come out of the membrane, fish nests should be cleaned immediately, and the larvae should be raised in a well-conditioned pool for raising. When the larvae are raised, they should be fed with cooked egg yolks. Each 100,000 fish fry should be fed with one egg yolk. The egg yolk should be crushed by hand and then filtered through a sieve of 120 mesh before feeding. The residue should be removed before the second day of feeding, and the new water should be added before feeding. The larval rearing time is generally 5 days, and can be transferred later. Feed into the pond.

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