Selection method of new cold-resistant species of tilapia

Abstract

The invention provides a selection method of new cold-resistant species of tilapia. The invention is characterized by determining the cold resistance of tilapia of different geographical population and screening the tilapia of different geographical population by adopting the technology such as colony continuous progeny selection, family selection, specialized line selection and the like and using natural screening and artificial low-temperature stress selection as the means, selecting the cold-resistant tilapia of specialized line and creating the selection method of new cold-resistant species of tilapia. The technology has the characteristics of strong pertinency, obvious effect and the like. The overwintering survival rate of the cold-resistant tilapia fries is over 80% and the low-temperature mortality of the tilapia is reduced by more than 15% than that of the common tilapia. The selection method opens up a new technical approach for breeding of cold-resistant species of fish, is suitable for being popularized and applied in fish selection and has great significance and application value in safe overwintering of the cultivated fish.

Description

technical field [0001] The invention relates to a method for breeding a new cold-resistant variety of tilapia, in particular to a method for selecting a new cold-resistant variety that can be used in the breeding of improved fish varieties. Background technique [0002] Tilapia is currently the second largest farmed fish in the world, and it is also the leading breed and export advantage in my country. my country's tilapia farming production, output value and export volume all rank first in the world, accounting for nearly half of the global total, making a significant contribution to world fishery production. Among them, in 2008 and 2009, the output value of my country's tilapia reached 950,000 tons, 1.15 million tons, 9.50 billion yuan, and 9.20 billion yuan respectively, accounting for more than 50% of the world's total output; in the past two years, my country's tilapia exports The volume and export value are 730 million US dollars and 710 million US dollars respectively...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of the lack of cold-resistant tilapia species in the subtropical aquaculture industry, and the poor ability of the tilapia aquaculture industry to resist cold damage, etc., to use different geographical populations of tilapia species for low-temperature screening, and to construct a basic group of cold-resistant species breeding and the core group; use the group subculture method, implement genetic evaluation, and select cold-resistant tilapia specialized strains; conduct specialized strain screening, and obtain new cold-resistant tilapia varieties, in order to adjust the winter culture of tilapia in my country Variety structure, improve the tilapia industry's ability to resist cold disasters, prolong the effective breeding cycle of tilapia throughout the year, reduce the mortality rate during winter and early spring stocking, reduce the risk of aquaculture, and ensure the continuity and stability of the tilapia industry , healthy development, promoting the construction of new countryside and increasing farmers' income, etc. all have a huge role

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