River crab breeding method using early-bred crab larva

Abstract

The invention relates to a method for culturing river crabs by utilizing the early breeding crab larvae, in particular to a method, by which the river crabs are cultured in a pond or other water areas and become large-size commercial crabs. The method is characterized in that the method comprises the steps of (1) purchasing the early breeding crab larvae: the selection of the crab larvae purchasing date, the selection of the crab larvae quality, and the transportation of the crab larvae; (2) culturing the early culturing crab larvae: the disinfection of the culture pond, the arrangement of the escape preventing fence, fertilization, water injection to the crab larvae pond, the cultivation of water grass, the stocking of the early breeding crab larva, and the feeding of artificial food; (3) controlling the gonad development speed of crabs: the crabs getting through the summer artificially, the crabs getting through the winter and grow naturally, the stocking of the crabs, the management of the crab larvae getting through the winter, the promotion of the river crab for exuviation and growth, and the culture and the harvesting of the river crab. The crabs, the gonad of which is immature are cultured by utilizing the early breeding crab larvae produced at the beginning of December to the end of the April in the ensuing year; the growing period of the early breeding crab larvae can be prolonged, and the sexual precocity can not happen; through the artificial over-summer and the natural over-winter technologies, the early breeding crab larvae can become the crabs for the river crab culture; the crabs cultured by utilizing the early breeding crab larva can be cultured into the grown crab with the specification being 200 to 400g for each.

Description

technical field [0001] The invention relates to a method for growing river crabs by using early-propagation crab seedlings, in particular to a method for raising river crabs into large-scale commercial crabs in ponds or other waters. Background technique [0002] The scientific name of the river crab is Eriocheir Sinensis H.Milne Edwards, which is one of the high-quality aquatic economic species in my country. Since the 1980s, my country has extensively carried out artificial breeding and breeding of river crabs, and formed an industrialized production system. With the expansion of breeding scale and the improvement of consumption level, the river crab farming industry has changed from simply pursuing an increase in output and quantity to focusing on improving efficiency and quality, and the farming form is also changing from labor-intensive to technology-based and knowledge-based. The improvement of breeding efficiency requires not only increasing the output, but also incr...

AI Technical Summary

Problems solved by technology

Therefore, using the traditional river crab breeding method, the size of the commercial crabs grown is relatively small, most individuals are between 100-150 grams, and some individuals are 50-100 grams and 150-300 grams, while the individuals raised by early breeding crab seedlings are smaller