Breeding method of a new strain of Kumamoto oyster resistant to low temperature in the north

Abstract

The present invention provides a method for cultivating a new strain of low temperature resistant Crassostrea sikamea in the North, wherein Crassostrea sikamea and Crassostrea gigas that belong to Crassostrea are selected; by use of Crassostrea sikamea and Crassostrea gigas with different temperature tolerance and salt tolerance, through hybridization and then selfing, purification, hybridization,and selfing for multiple generations of breeding, finally the new strain of low temperature resistant Crassostrea sikamea is obtained. Practice has proved that the outstanding advantages of the low temperature resistant Crassostrea sikamea obtained by the use of the method in farming are improved low temperature resistance, high survival rate, and greatly increased growth rate, and compared withordinary varieties of Crassostrea sikamea, the growth rate can be increased by 30%, the survival rate is increased by 50%, and the low temperature resistance is increased by 5-6DEG C. The new strain of Crassostrea sikamea obtained by the use of the method can overcome the winter death problem of Crassostrea sikamea in the North and ensure the sustainable development of Crassostrea sikamea farmingindustry.

Description

technical field [0001] The invention relates to a Kumamoto oyster breeding technology, in particular to a method for cultivating a low temperature-resistant Kumamoto oyster new variety in the north by using low temperature and hybridization and self-breeding. Background technique [0002] Kumamoto Oysters ( Crassostrea sikamea ), belonging to the Oyster family ( Ostridae ) giant oyster ( Crassostrea ), mainly distributed in the Ariake Sea in Japan, and there are also wild Kumamoto oyster subspecies distributed in coastal areas such as Jiangsu, Guangdong, and Fujian in my country, but the individual individuals are small, the meat tastes poor, and basically has no edible value. The Kumamoto oyster colony cultivated in the United States was formed in the 1950s by Japan's introduction to the east coast of the United States. [0003] Compared with long oysters, Kumamoto oysters have the characteristics of slow growth, low temperature resistance, and suitable for high temper...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for cultivating new varieties of Kumamoto oysters resistant to low temperature in the north, so as to overcome the problems of death caused by low temperature and other reasons, intolerant to high salt and slow growth rate, etc. in the cultivation process of Kumamoto oysters

[0006] In order to solve the problem of high mortality of Kumamoto oysters in the low temperature period in winter in recent years in the north, both Kumamoto oysters and long oysters belong to the genus Macrophylla. As well as the biological characteristics of not being able to tolerate high salt, the Kumamoto oyster and the long oyster were cross-bred, but the two reproduced in two different seasons of spring and summer, that is, how to solve the developmental synchronization between the Kumamoto oyster and the long oyster One of the Key Issues in Hybrid Breeding