Method for cultivating new variety of hybridized and backcrossed Argopecten purpuratus

Abstract

The invention relates to a method for cultivating a new variety of hybridized and backcrossed Argopecten purpuratus. The method is characterized by comprising the following steps of: selecting excellent individuals in a hybridized first filial generation family or group of Argopecten irradians and the Argopecten purpuratus; backcrossing the excellent individuals with the Argopecten purpuratus to establish a backcrossed family or group; selecting hermaphroditic excellent individuals with good representation in the backcrossed family or group; and continuously cultivating at least third generations of self-bred families to obtain the new variety of the hybridized and backcrossed Argopecten purpuratus having the advantages of steady heredity, rapid growth, large individuals and wide temperature tolerance range. According to the method provided by the invention, the new variety can be cultivated in sea areas in the north, such as Qingdao, Dalian and the like; and, compared with the Argopecten irradians, the yield at the same year is increased by more than 30%.

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 backcross 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 a...

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

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