Method for breeding low-temperature-tolerant strain of Argopecten irradias hybrid-backcrossed scallops

Abstract

The invention relates to a method for breeding low-temperature-tolerant strain of Argopecten irradias hybrid-backcrossed scallops, characterized by including: selecting individuals that are high in growth speed and tolerance to low temperatures from Argopecten irradias and Argopecten purpuratus hybrid first-generation family line or population as breed scallops; backcrossing the individuals having high tolerance to low temperatures in the hybrid first generation with semen of Argopecten irradias to establish a backcrossed family line or population; finally, performing breeding of low-temperature-tolerant breeding core population at least three times to develop a low-temperature-tolerant strain. The Argopecten irradias and Argopecten purpuratus hybrid first-generation high in growth speed and significant in hybridization advantage is used as a female parent that is backcrossed with Argopecten irradias (male parent) to gather cold-tolerant genes of Argopecten irradias to the Argopecten irradias hybrid backcrossed first-generation, the individuals having high tolerance to low temperatures in the Argopecten irradias hybrid backcrossed first-generation are used as a breeding core population, the breed core population is subjected to continuous three generations of low-temperature-tolerant breeding, and the strain can tolerate a low temperature down to 0 DEG C and grows 15% higher than Argopecten irradias. It is apparent that the method is simple and convenient to perform and is widely applicable to the breeding of low-temperature-tolerant strains of hybrid scallops.

Description

technical field [0001] The invention belongs to the breeding technology of shellfish aquaculture, and in particular relates to a method for cultivating low-temperature resistant strains of sea hybrid backcross scallops. Background technique [0002] The bay scallop (Argopecten irradians irradians) is native to the Atlantic coast of the United States and was introduced to my country in 1982. Due to its fast growth, short breeding cycle and wide temperature tolerance range (-1-31°C), the scallop has become the main cultured species in northern my country (Zhang Fusui, 2000), and its output once reached more than 800,000 tons in 2005. However, due to its own small commodity size (about 5-6 cm), short life span (about 13 months) (Dall., 1909; Minchin., 2003), and long-term sterility after introduction, resulting in breeding quality degradation, resulting in smaller and smaller commercial shellfish (Zhang Guofan et al., 2003), high mortality rate in the breeding process, for exa...

AI Technical Summary

Problems solved by technology

However, due to its own small commodity size (about 5-6 cm), short life span (about 13 months) (Dall., 1909; Minchin., 2003), and long-term sterility after introduction, resulting in breeding quality degradation, resulting in smaller and smaller commercial shellfish (Zhang Guofan et al., 2003), high mortality rate in the breeding process, for example, in 2007, the bay scallop mortality rate was as high as about 70%, which has seriously restricted the development of the bay scallop aquaculture industry in our province. develop

In response to this phenomenon, domestic shellfish breeders have improved the germplasm of bay scallops through introduction and rejuvenation, and achieved some results, but failed to fundamentally solve the problem of germplasm degradation.