Method for establishing nile tilapia merit female pure line

Abstract

The invention discloses a method for establishing a nile tilapia merit female pure line. Only XX female tilapia is generated through gynogenetic egg chromosome doubling, false male tilapia (XX) obtained after sex reversion can carry out fertilization normally with the female tilapia, so that fry of the later generation are all female tilapia, and in other words, the female pure line is achieved. The nile tilapia merit female pure line is established through the method of parent selecting, maturation accelerating of parents, gynogenesis, sex reversion and inbreeding, and the merits of nile tilapia as reproduction female parents are effectively maintained.

Description

technical field [0001] The invention belongs to the germplasm improvement technology of Nile tilapia. In particular, it is a method for establishing a pure line of female Nile tilapia through parental selection, ripening, gynogenesis, sex reversal of gynogenetic offspring, and male-female mating after reversal. Background technique [0002] Oni hybrid tilapia (the offspring of the male parent of Oria tilapia mated with the female parent of Nile tilapia) is one of the main species of tilapia cultured in my country. After nearly 20 to 30 years of breeding, especially the parent The over-utilization of the parental species increases the genetic diversity of the parents. It is difficult to obtain precise improvements in the genetic traits through the traditional phenotypic trait selection method, resulting in the reproductive rate of the female parent (Nile tilapia) and the produced Oni hybrid. The male rate, stress resistance and other traits of tilapia fry have different degree...

AI Technical Summary

Problems solved by technology

[0002] Oni hybrid tilapia (the offspring of the male parent of Oria tilapia mated with the female parent of Nile tilapia) is one of the main species of tilapia cultured in my country. After nearly 20 to 30 years of breeding, especially the parent The over-utilization of the parental species increases the genetic diversity of the parents. It is difficult to obtain precise improvements in the genetic traits through the traditional phenotypic trait selection method, resulting in the reproductive rate of the female parent (Nile tilapia) and the produced Oni hybrid. There are different degrees of differences and differentiation in the male rate and stress resistance of tilapia fry, and there is a decline trend in the excellent traits of the species