A breeding method for increasing the proportion of high-grade commercial crabs

Abstract

The invention discloses a new method for increasing the proportion of superior commodity crabs. Juvenile river crabs in a large specification cultured in natural water at the high attitude in northern areas of China are bred in southern areas in an intensive cultivation manner to produce commodity crabs. The juvenile river crabs are cultivated for two years, the weight of the juvenile river crabs is 8-10 times that of river crabs cultured with a traditional breeding method, and an existing breeding mode is improved from the breeding source, namely, the variety; as for the breeding procedure, the juvenile river crabs are released in autumn instead of in winter or spring in the traditional breeding method; as for a breeding mode, a temporary cultivation and domestication stage is added, and a one-level breeding mode is changed into a two-level breeding manner; as for breeding management, a constitution strengthening link from release of the juvenile river crabs in autumn to overwintering is added, a traditional feeding mode is changed into an intensive-intensive-intensive-strengthened feeding mode, and demands of the juvenile river crabs during overwintering and growing for nutrients are met effectively. Besides, water plant cultivation in a water pond, promotion of shell removal, conditioning of water quality and other breeding techniques are adopted, and the breeding proportion of the superior commodity crabs is remarkably increased.

Description

technical field [0001] The invention belongs to the technical field of aquaculture, and relates to a method for increasing the growth ratio of high-grade commercial crabs in the ecological cultivation of Chinese mitten crabs. Background technique [0002] The Chinese mitten crab aquaculture industry is one of the representative aquaculture industries unique to my country, and it is also one of the main industries that earn foreign exchange from the export of aquatic products in my country. At present, in the domestic and foreign markets, the price of high-quality commercial crabs has always remained high, and the cultivation ratio of high-quality commercial crabs has become the most important component of the breeding benefits of Chinese mitten crabs. At present, the way to explore high-grade crab breeding technology is mainly to reduce the seed stocking density and increase the seed breeding specification. Because reducing the seed stocking density will bring about a signif...

AI Technical Summary

Problems solved by technology

At present, the way to explore high-grade crab breeding technology is mainly to reduce the seed stocking density and increase the seed breeding specification. Because reducing the seed stocking density will bring about a significant decrease in yield per unit area, and increasing the seed breeding standard is often restricted in practice. Limited to a substantial increase in the rate of precocious puberty