Breeding method of scapharca subcrenata rapid growth varieties

Abstract

The invention discloses a breeding method of scapharca subcrenata rapid growth varieties. The method includes the steps of base-population establishment, selectively-bred F1 generation construction, selective breeding effect evaluation and continuous selective breeding. The method specifically includes the steps that mature individuals of wild scapharca subcrenata of the same age are determined asbreeding base populations; the individuals with the shell length and the wet weight 8-10% of these of the base populations are selected, and a conventional method is adopted for cultivating the individuals into F1 generations; the shell length, the total weight and other characters of selectively-bred generations and the shell length, the total weight and other characters of control groups whichare not selectively bred and cultivated in the same period are measured periodically, the genetic parameter is estimated, and the genetic gain of the shell length and the total weight of each selectively-bred generation is about 3-6%. The method uses the shell length and the total weight as selective breeding objects, 8-10% high selection pressure is used for continuous selective breeding, and compared with the control groups, the cultivated new scapharca subcrenata varieties can show 3-6% growth advantages in the aspects of the shell length and the total weight. The excellent varieties cultivated by the method can serve as rapid growth varieties, can be directly used, and can be hybridized with other excellent varieties for breeding, and the scapharca subcrenata varieties having other excellent properties are selectively bred.

Description

technical field [0001] The invention relates to a method for cultivating fast-growing strains of cockles, and belongs to the technical field of agricultural marine culture. Background technique [0002] Scapharca subcrenata, commonly known as corrugated seeds or clams, has tender meat, delicious taste, rich in protein, fat, carbohydrates, and various trace elements such as calcium, phosphorus, iron, zinc, etc. The medicinal value of digesting food has high economic value, and it used to be the shellfish with the largest output along the coast of Liaodong Bay. In the 1970s, the annual output of cockles in Liaodong Bay reached more than 100,000 tons. After the 1990s, due to the influence of overfishing and environmental pollution, the resources of cockles became increasingly scarce, which was far from meeting the market demand. [0003] In recent years, more and more attention has been paid to the cultivation and breeding of cockles, and there have been many reports on artifi...

AI Technical Summary

Problems solved by technology

[0004] Shellfish genetics and breeding have been successfully carried out in important economic shellfish such as oysters, scallops, and abalones, but the work related to the selection and breeding of fine clams has just started. Breeding or family selection methods are used to select for target traits, but there are still problems such as unclear breeding traits and lack of genetic parameter data for target traits

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