Breeding method for excellent new strain of stichopus japonicus

Abstract

The invention discloses a breeding method for new strain of stichopus japonicus, comprising the following steps of: 1) selecting excellent individuals in a wild stichopus japonicus population as parents, breeding at random, and selecting and remaining at high selection intensity, thereby establishing a base population; 2) carrying out blocked breeding to obtain single-character selected first filial generation, and continuing to select and remain at high selection pressure, and selecting stichopus japonicus individuals having excellent characters as parents for next generation; and 3) carrying out continuous progeny selection of the single-character population, and then carrying out a plurality of generations until the stichopus japonicus selected new strain having heritable excellent characters is obtained. The breeding method for excellent new strain of stichopus japonicus is high in strain selection teleonomy and most effective for quality characters; the scale of subculture blocked breeding of the population is large, the efficiency is high, the level of genetic polymorphism is kept well, the growth advantage and the volume increase effects are obvious, and the growth speed of stichopus japonicus is increased; and the obtained stichopus japonicus individuals are less in difference and have high stress resistance and disease resisting ability, and thereby having excellent economic benefit and wide breeding prospect.

Description

technical field [0001] The invention belongs to the field of aquatic genetics and breeding, and in particular relates to a method for breeding new strains of sea cucumbers. Background technique [0002] In the past ten years, the sea cucumber breeding industry in northern my country has developed rapidly, with a scale of several million mu, an output value of nearly 20 billion yuan, and a huge demand for seedlings. However, the artificial breeding of sea cucumbers in my country has always been based on natural wild populations as ginseng. Because the genetic background of the parents is unclear and has not been genetically improved, the quality of the breeding seedlings is uneven, and the stability of production traits is poor. During the process, there are often adverse symptoms such as slow growth, large individual differences, poor stress resistance, and frequent occurrence of diseases. The main reason is the mixed quality of natural population germplasm. The germplasm pro...

AI Technical Summary

Problems solved by technology

However, the artificial breeding of sea cucumbers in my country has always been based on natural wild populations as ginseng. Because the genetic background of the parents is unclear and has not been genetically improved, the quality of the breeding seedlings is uneven, and the stability of production traits is poor. During the process, there are often adverse symptoms such as slow growth, large individual differences, poor stress resistance, and frequent occurrence of diseases. The main reason is the mixture of good and bad germplasm in natural populations. The germplasm problem has become one of the important bottlenecks restricting the development of sea cucumber industry.