Method for reproducing snakehead fishes by using artificial insemination and hatching barrel

Abstract

The invention belongs to the technical field of fish reproduction and discloses a method for reproducing snakehead fishes by using artificial insemination and a hatching barrel. The method comprises the following steps: temporarily rearing selected parent fishes in a cement pond at the water temperature of 25-26 DEG C and performing spawning induction; in the cement pond at the water temperature of 28-29 DEG C, after the effect time, carrying out inspection and ore squeezing once every 2 h, three times in total; temporarily rearing parent fishes after ore squeezing, preventing inflammation with a penicillin agent to keep the survival rate of female parent fishes at 75% or above; taking testes from male fishes, and grinding the testes in a sperm preservation solution in a separated manner with a metal net; and before fertilization, activating sperm in the sperm preservation solution, then pouring ores for fertilization, hatching the ores in the hatching barrel after leaving the ores tostand for more than 2 h, and inflating the hatching barrel; taking out fertilized ores after hatching the ores in the barrel for 2 days, and performing fry culture after yolk sacs are absorbed 1-2 days later. The method significantly the utilization rate of female parent fishes and the survival rate of the female parent fishes after spawning, reduces field occupation and increases the fry hatchingsuccess rate.

Description

technical field [0001] The invention belongs to the technical field of fish reproduction, and in particular relates to a method for breeding snakehead fish by using artificial insemination and hatching barrels. Background technique [0002] At present, snakehead is a high-quality freshwater economic fish, which has the characteristics of less bone spurs, fresh and tender meat, and rich nutrition. [0003] The seed propagation of Channa is mainly through the natural spawning method of 1:1 pairing after induced spawning. It is necessary to use a foam box or cement to produce ovaries. Because the male fish of the snakehead will chase and bite the female fish and slap the female fish with its tail during the natural spawning process, which will prompt the female fish to go into estrus and spawn. Many postpartum female fish will be scarred and the postpartum survival rate is not high. This is also the reason why most broodstock can only be used for one year. Moreover, natural s...

AI Technical Summary

Problems solved by technology

When paired to lay eggs, the postnatal survival rate of the female broodstock is less than 10%, and there is no value for continued breeding, resulting in the broodstock can only be used for one year

[0005] (2) Existing mating spawning and hydrostatic hatching technologies cannot reduce the area occupied by the breeding farm or increase the production scale in the same field

[0006] (3) Existing static water hatching technology cannot avoid the damage of saprolegniasis to normal developing eggs produced by dead eggs

Through experiments, the present invention finds that the fertilized eggs of snakeheads can be hatched in the hatching bucket after standing for a period of time, but the low hatching rate in the previous test is mainly because they are put into the hatching bucket immediately after fertilization, and the development stops after the eggs roll over.

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