Cultivation method of new high-salt-resistant hybrid oyster strain in South China

Abstract

The invention discloses a cultivation method of a new high-salt-resistant hybrid oyster strain in South China. The method comprises the following steps of preparing a hybrid F1; performing phenotypic character comparison, character separation and identification, reproductive potential evaluation and excellent separation type screening on a hybrid self-breeding offspring F2 under different environmental effects; performing phenotypic character comparison, reproductive potential evaluation and excellent strain determining of a hybrid F3 under different environmental effects; and performing the technical links such as hybrid F4 self-propagation and the like to obtain the new high-salt-resistant hybrid oyster strain suitable for the South China. The strain is different from new oyster hybrid strains obtained in the past, the new hybrid strain is screened out by performing continuous self-propagation screening on different segregation types of the hybrid F2, and the traditional concept that all the segregation types of the hybrid F2 show hybrid disadvantage is overturned; through environmental genotype effect analysis, a set of novel hybrid oyster new strain breeding method is created. and the new hybrid strain obtained by the method has the characteristics of fast growth, strong stress resistance, genetic stability and the like, and the yield is increased by 10%-15% or above.

Description

Technical field: [0001] The invention belongs to the technical field of shellfish genetics and breeding in marine agriculture, and in particular relates to a method for cultivating a new high-salt-tolerant hybrid oyster strain in South China. Background technique: [0002] Hybrid breeding is an important way of aquatic animal breeding, which is divided into interspecific hybridization and intraspecific hybridization. Interspecific hybridization refers to the mating between two different types of parents whose taxonomic status is higher than that of species. By hybridization, F 1 The progeny may combine the excellent traits of the parents and even have the excellent traits that the parents do not have, resulting in heterosis. Hybrid F 1 Hybrid F 2 In animals and plants, there are generally trait segregation and hybrid disadvantages, but through the hybrid F 2 Through the screening and identification of different segregation types, it is possible to select a strain that st...

AI Technical Summary

Problems solved by technology

However, in recent years, due to the increase in salinity in the estuary area every year from March to July, the mortality rate of oysters in Hong Kong has risen sharply, and the mortality rate in some areas has reached 90%. A new strain of oyster with strong reversibility

The near river oyster (C. ariakensis) is distributed in both the north and the south of my country, but its breeding range is mainly distributed in the south as an economic oyster species. It has the advantages of fast growth, high salt tolerance, and strong disease and stress resistance. Its meat is red or yellow, and it is called "red-eyed oyster" in southern China, which makes its sales and price far lower than that of Hong Kong oysters, and its aquaculture area and production are shrinking year by year

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