High-reproduction type Nile tilapia and blue tilapia cross-breeding line selection method

Abstract

The invention discloses a selection method capable of improving the reproductive performance of a Nile tilapia and blue tilapia cross-breeding line and relates to the technical field of improved variety selection in the field of aquaculture. The method aims to solve the problem that the fry yield of a Nile tilapia and blue tilapia cross-breeding line in the prior art is low, and the problem is solved through population hybridization screening, individual hybridization screening, breeding of the line and continuing of selection. Selection is directly conducted according to cross-breeding properties of male parents and female parents in the Nile tilapia and blue tilapia cross-breeding line, individuals in which cross-breeding is most likely to happen are selected from populations to form parent groups for conducting reproduction and continuing selection, favorable genes related to cross-breeding properties are polymerized, cross-breeding fry output performance of the line is remarkably improved through a plurality of generations of selection, the technical problem about selection of the high-reproduction type Nile tilapia and blue tilapia cross-breeding line is broken through, the selection method is greatly simplified, the selection cost is reduced, development of Nile tilapia and blue tilapia large-scale breeding is promoted, and economic benefits are improved.

Description

technical field [0001] The invention relates to a technique for breeding fine species in the field of aquaculture, in particular to a method for breeding a high-propanity neotilapia hybrid line. Background technique [0002] Neo tilapia is the offspring produced by the hybridization of Nile tilapia (♀) and Olia tilapia (♂). It has the characteristics of high male rate, cold resistance and strong disease resistance. Under the background that the current tilapia aquaculture industry is increasingly threatened by freezing cold and streptococcal disease, the advantages of its promotion and aquaculture are becoming more and more prominent, and the demand for seed is increasing year by year. However, the seed yield of existing hybrid tilapia lines is generally low, only 10% to 30% of the seed yield of Gifu tilapia under the same conditions, resulting in a serious shortage of seed supply and rising prices. It has greatly increased the culture cost of Oni tilapia, which is unfavora...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for breeding high-propagation neo-tilapia hybrid mating lines, which is used to solve the problem that the seedling yield of neo-tilapia hybrid mating lines in the prior art is generally low, and only Jifu 10%~30% of the tilapia seed production, resulting in a serious shortage of seed supply and rising prices, which greatly increased the cost of aquaculture of tilapia, which is not conducive to the development of the industry

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