Pseudo-male and full-female nile tilapia fingerling production method

Abstract

The invention discloses a pseudo-male and full-female nile tilapia fingerling production method. The method includes the following steps that the step 1, fodder including methyltestosterone is fed continuously for 15 days after nile tilapia opens mouth, and phenotype full-male tilapia is obtained and bred to be sexually mature; the step 2, the phenotype full-male tilapia is used as male parents, common female nile tilapia is used as female parents, and compatriot families are established in the ratio of 1:1; the step 3, 100 fries are selected randomly from each family for methyltestosterone treatment, in addition, 100 fries commonly bred are selected randomly as a comparison set, the ratio of female tilapia and male tilapia in the comparison set is counted, medication treatment set male tilapia corresponding to the full-female comparison set is the pseudo-male tilapia with sex chromosome XX, and the pseudo-male tilapia is selected and remains and is bred to be sexually mature; the step 4, the sex chromosome of offspring bred through the pseudo-male tilapia and the common tilapia is XX, large-scale fingerling production of the full-female tilapia can be achieved through common breeding, and mass production of the pseudo-male tilapia can be achieved through methyltestosterone treatment. According to the method, the quality of fingerling of the tilapia can be improved, the fingerling production efficiency can be improved, and fingerling production cost can be reduced.

Description

technical field [0001] The invention belongs to the field of aquatic animal breeding. Specifically, it is a seed production method of pseudo-male and all-female Nile tilapia. Background technique [0002] Gifu strain Nile tilapia (hereinafter referred to as Gifu tilapia) and Oni tilapia are the most important species of tilapia cultured in my country. The female parents of these two species of tilapia fry are female Nile tilapia Non-fish, due to the low fecundity of tilapia and the harsh screening conditions for seedlings, the preparation of tilapia seedlings requires a lot of manpower and financial resources, and the preparation of female Nile tilapia seedlings is the key factor affecting the input. [0003] Breeding of tilapia fingerlings is generally based on growth, shape, body color, stripes, etc., and is generally completed after three stages of screening. The number of multiplication fry of Gifu tilapia is more than 7 times the number of fishes that are planned to be...

AI Technical Summary

Problems solved by technology

At present, in tilapia breeding farms, there are generally problems such as large investment in tilapia female parent seed production