Method for breeding all-female and super-male fish of pure-line yellow catfish to produce all-male fish on a large scale

Abstract

The invention discloses a method for breeding pure yellow catfish all-female fish and super-male fish and producing all-male fish in large scale. The method comprises the following steps: screening wild original yellow catfish with excellent characters from the Changjiang river system, and using an artificial gynogenesis technology and a hormonal reverse method to establish a pure yellow catfish all-female fish germplasm bank; then using pure yellow catfish as a foundation, applying a GMT technology and a transsexual and test-crossing method to breed pure yellow catfish all-female fish and super-male fish, and establishing a super-male yellow catfish germplasm bank; combining super-male yellow catfish with pure all-female yellow catfish, establishing a full-male yellow catfish breeding system, and producing pure full-male yellow catfish fries in a large scale for breeding commercial fish. The method effectively overcomes successive-generation degeneration of yellow catfish germplasm, so that the disadvantage for culture benefit is reduced. The yellow catfish produced according to the technical route is pure in germplasm, high in stress resistance and environment-friendly, and an efficient, stable, healthy, environment-friendly, energy-saving and income-increasing reliable channel is provided for yellow catfish breeding industry with sustainable development.

Description

technical field [0001] The invention belongs to the technical field of fish bioengineering and cell engineering genetic breeding, and specifically relates to a method for breeding all-female pure-line pelagic catfish and super-male fish for large-scale production of all-male fish. Background technique [0002] It has been 20 years since the yellow catfish has been transferred from purely wild to fully artificial breeding. During this period, most of the fast-growing and large adult fish were eaten by people. Only the slow-growing and small sub-grade fish ("mao mao") under the fish sieve were kept for breeding for one year and supplied to yellow catfish. The female fish used for breeding in the fish hatchery is used to produce ordinary or all-male fry of yellow catfish. In addition to inbreeding, year after year, the germplasm is not as good as one generation; Fish individuality and growth rate are 2-3 times that of female fish. Although all-male fish breeding has started i...

AI Technical Summary

Problems solved by technology

Although all-male fish breeding has started in China in the past five years, the supply of the super-male fish YY♂ used in the production of all-male fry is tight, expensive, and even not supplied externally. Only in the hands of a few people, it is difficult for ordinary seedling farms and farmers to test and identify the parent YY♂ and the whole male seedling XY♂

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