Method for establishing cultured hyriopsis cumingii families and selecting improved varieties

Abstract

The invention relates to a method for establishing cultured hyriopsis cumingii families and selecting improved varieties, which comprises the following steps: 1) firstly, preferably selecting energetic parent hyriopsis cumingii free of shell damage with the weight 15 to 20 percent heavier than the average weight from the parent hyriopsis cumingii as candidate parent hyriopsis cumingii with a selection intensity of 20 percent, selecting the parent hyriopsis cumingii with the ratio of shell width to shell length 15 to 20 percent greater than the average ratio from the candidate parent hyriopsis cumingii as breeding parent hyriopsis cumingii with a selection intensity of 30 percent, setting a comprehensive selection intensity of two indicators to 6 percent, and culturing each female hyriopsis cumingii in a spawning pool with an independent water source respectively, culturing the descendents of each female hyriopsis cumingii and establishing the families respectively from mating, culture in host fish, breeding to pearl development, eliminating the unqualified families continuously during the culture, and selecting the remaining families as the basic families for breeding the next generation; and 2) preferably selecting the improved varieties in the key period of breeding the hyriopsis cumingii families, which includes three stages, namely a stage when juvenile hyriopsis cumingii leave the pool, a stage before inserting pearls and a stage before maturing in the production of breeding the pearls of the hyriopsis cumingii.

Description

technical field [0001] The invention relates to the selection and breeding of fine varieties of the cultivated S. sinensis, in particular to a method for establishing a family of the cultured S. sinensis and breeding the improved varieties. Background technique [0002] my country's freshwater pearl cultivation areas are mainly distributed in Zhejiang, Jiangsu, Hunan, Hubei, Sichuan, Anhui and other places on both sides of the middle and lower reaches of the Yangtze River. The national freshwater pearl cultivation area is nearly 1.2 million mu, among which there are more than 1,200 large-scale farming households with more than 100 mu, more than 30 breeding enterprises with more than 1,000 mu, 15 with more than 5,000 mu, and 8 with more than 10,000 mu. Large-scale breeding enterprises are mainly concentrated In Zhejiang and Jiangsu provinces. In 2006, the sales volume of pearls and related products in the world was about 5 billion U.S. dollars, and that of China was about 50...

AI Technical Summary

Problems solved by technology

Widely distributed in Hunan, Hubei, Anhui, Jiangsu, Zhejiang, Jiangxi and other provinces, especially Poyang Lake and large and medium-sized lakes are more distributed, and the yield is higher. It is an excellent freshwater pearl mussel unique to China, but it lacks high yield and high quality. The excellent varieties with strong stress resistance are still obvious; the phenomenon of germplasm degradation is serious, and the individual of some cultured species becomes smaller, precocious, poor disease resistance and other defects seriously hinder the further development of breeding production