Four-strain mating pair-hybridization breeding method for litopenaeus vannamei

Abstract

The invention relates to a four-strain mating pair-hybridization breeding method for litopenaeus vannamei, and belongs to the field of genetic breeding for aquatic animals. The method specifically comprises the steps of collecting breeding materials, and constructing four specialized strains including a fast-growth strain (strain A), a high survival / high propagation strain (strain B), a high survival / fast growth strain (strain C) and a high propagation strain (strain D); conducting primary hybridization testing between the fast-growth strain (strain A) and the high survival / high propagation strain (strain B) to select an optimal hybridization combination (AB) with high growth speed; meanwhile, conducting primary hybridization testing between the high survival / fast growth strain (strain C)and the high propagation strain (strain D) to select an optimal hybridization combination (CD) with high fertility; conducting secondary hybridization testing between the optimal hybridization combination (AB) with high growth speed and the optimal hybridization combination (CD) with high fertility to screen out an optimal mating combination (ABCD) to serve as commercial young litopenaeus vannamei. The finally-cultivated strain has the advantages of being high in growth speed and survival rate, and shows obvious yield strengths in different breeding modes.

Description

technical field [0001] The invention relates to the field of genetic breeding of aquatic animals, in particular to a four-line matching double-hybrid breeding method of Litopenaeus vannamei. Background technique [0002] Litopenaeus vannamei, also known as white Pacific shrimp, is produced in Central and South America. The wild population is distributed in the Pacific coast waters from Mexico to Chile. The natural water temperature in this area is above 20 degrees all year round. my country's Litopenaeus vannamei aquaculture industry has experienced explosive growth since 2000, and has become the country with the highest aquaculture output of Litopenaeus vannamei in the world. In recent years, my country's annual aquaculture output has exceeded 1 million tons. [0003] With the expansion of the breeding scale, the demand for high-quality seedlings is becoming more and more urgent. my country's self-selected varieties have achieved good results, but the current varieties stil...

AI Technical Summary

Problems solved by technology

[0003] With the expansion of the breeding scale, the demand for high-quality seedlings is becoming more and more urgent. my country's self-selected varieties have achieved good results, but the current varieties still cannot meet the requirements of my country's Litopenaeus vannamei farming industry for new varieties and high-quality parent species. Shrimp demand, more than 300,000 pairs of broodstock still need to be imported every year

The excessive dependence on imports of broodstock has also brought about a series of problems: (1) The price of imported broodstock has been increasing year by year. Cutting off the supply of broodstock to the domestic market will seriously affect the entire downstream nursery, breeding, and processing industries