Method for breeding novel hybrid scallop variety of Argopecten purpuratus and Argopecten irradians irradians

Abstract

The invention relates to a method for breeding a novel hybrid scallop variety of Argopecten purpuratus and Argopecten irradians irradians. The method comprises the following steps of: establishing a plurality of Argopecten purpuratus and Argopecten irradians irradians hybrid first filial generation families by utilizing the fertilization of eggs of the Argopecten purpuratus and sperms of the Argopecten irradians irradians, selecting excellent hybrid families according to phenotypes of the hybrid families, selecting excellent androgynous individuals from the excellent hybrid families, accelerating maturity, and self-fertilizing respectively to establish a plurality of self-fertilization families; selecting excellent families from the self-fertilization families in the next year, further selecting excellent androgynous individuals from the excellent families and self-fertilizing, and selecting; and continuously self-fertilizing more than three generations by the same method so as to obtain the novel hybrid scallop variety of the Argopecten purpuratus and the Argopecten irradians irradians which has stable inheritance, is large in individuals and wide in a temperature tolerance rangeand can grow quickly. The novel variety can also be realized by a population breeding method. The novel hybrid scallop variety of the Argopecten purpuratus and the Argopecten irradians irradians synchronously has excellent characteristics of the Argopecten irradians irradians and the Argopecten purpuratus, so the novel variety can be cultivated in northern sea areas such as Tsingtao, Dalian and the like; and the yield is improved by over 30 percent compared with that of the Argopecten irradians irradians.

Description

technical field [0001] The invention belongs to the breeding technology of shellfish aquaculture, in particular to a method for cultivating a new variety of purple sea hybrid scallop. 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. The bay scallop grows fast, has a wide range of temperature adaptability, and has strong stress resistance. It is very suitable for farming in the northern seas of my country. At present, the output and farming area account for more than 50% of the scallop farming in my country. Due to the long-term inbreeding after the introduction, the germplasm of bay scallops has been severely degraded during the breeding process, showing that the size of commercial shellfish is getting smaller and smaller, and the mortality rate in the breeding process is high. For example, in 2007, the mortality rate of bay scallop broodstock reached ...

AI Technical Summary

Problems solved by technology

1) Due to the genetic instability of the first generation of hybrids and the separation of growth traits in the offspring, it is necessary to use purple scallops and bay scallops for seed production every year, which is relatively cumbersome; Summer and winter, and grow slowly in my country's sea areas, so it is quite difficult to obtain purple scallop broodstock for breeding the first generation of hybrids

3) Since bay scallops and purple scallops are both hermaphroditic scallops, sperm and eggs are released at the same time, and the sperm or eggs are easily polluted by eggs or sperm of the same species, and it is difficult to perform interspecific hybridization, resulting in the true The proportion of hybrid offspring is greatly reduced, which greatly limits the increase in yield

[0005] Obviously, there are great difficulties in popularization because of the need to breed two kinds of broodstock at the same time and it is difficult to realize the hybridization between two hermaphroditic scallops