A method to quickly obtain functional males of grouper by controlling the number of groups

Abstract

The invention discloses a method of quickly acquiring functional male groupers by controlling population size; the method comprises the steps of (1) selecting parent fishes, to be specific, selecting healthy adult groupers at the age of 3-4 in breeding season of groupers; (2) adding one male fish and 3-6 female fishes into a rearing pond, and constructing a breeding population for rearing in the breeding season of groupers, wherein the male fish has largest size, and the female fishes are unequal in size; (3) removing the male fish from the population 1 week after rearing, rearing continuously for 2-3 weeks, inspecting the sexual gland of the largest groupers in the population, reversing the largest female fishes sexually into functional male fishes to obtain functional male fishes. The method has the advantages that the period is short, operating is simple, determinacy is good, semen yield of male fishes is stable, and semen quality is good.

Description

technical field [0001] The invention relates to a method for quickly obtaining functional male fish of grouper, in particular to a method for obtaining functional male fish of oblique banded grouper. Background technique [0002] Grouper is a typical hermaphroditic fish, and the female is precocious, that is, it is all female when it reaches sexual maturity for the first time, and it can only be transformed into a male at an advanced age. For grouper artificial reproduction, the acquisition of male fish is a key issue. [0003] In natural sea areas, the natural sex reversal of most species of grouper generally occurs in older and larger individuals. Because of this characteristic of grouper, it takes a long time to obtain male broodstock in the breeding process and it is difficult to breed, which directly increases the difficulty of grouper breeding. Therefore, how to quickly obtain functional male grouper has become a key issue in grouper breeding. [0004] At present, m...

AI Technical Summary

Problems solved by technology

[0006] The advantage of hormone induction is that the time is short and the risk is small, and grouper males can be obtained after a period of induction. The disadvantage is that the operation is more troublesome and the cost is higher

The sex reversal of young grouper induced by hormones requires about 2 to 3 months of continuous treatment, and the workload is relatively large, and the obtained male fish may degenerate back to female after stopping the hormone induction, and the sperm production of male fish can be sustainable. Poor sex

In addition, there are still problems with the safety of exogenous hormones

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