In-water cage cultivation technique for fast-growing sea crabs

Abstract

The invention relates to the technical field of aquaculture, in particular to an in-water cage cultivation technique for fast-growing sea crabs, comprising cultivation facilities and cultivation operations. The in-water cage cultivation technique is characterized in that a cultivation pool is located at seaside, water in the pool is 1.5 meters in depth, the water is transparent at a depth of more than 1 meter, the water temperature is 20-30 DEG C, and the salinity of the water is 5-25 permillage; cultivation cages for green crabs are arranged, each cultivation cage consists of an upper body and a lower body, the lower body is a cultivation chamber, the upper body is a feeding and observing chamber, and circular holes with diameter of 1 cm are distributed around the cultivation cage; a plurality of cultivation rafts for placing the cultivation cages are arranged, and each cultivation raft is provided with a frame made from 3-4 PVC (polyvinyl chloride) tubes; an operation platform leading to the two sides of the pool is set up at the middle position of the cultivation pool; the green crabs are cultivated according to a proportion of 60 thousands of green crabs per 10 thousands square meters of cultivation water surface, for each cultivation cage, the ratio of daily feeding amount to the body weights of the crabs is 1 / 10, and feeding is performed once every day. With the adoption of the in-water cage cultivation technique for the fast-growing sea crabs, the limitation of indoor industrial cultivation is broken through, the soft-shell green crabs can be cultivated in a natural environment in a large area, the large-scale production of the soft-shell crabs is realized, and the cultivation cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of aquaculture, in particular to the technology of fast-growing sea crabs entering water in net cages. Background technique [0002] In 2008, the output of blue crab breeding in my country was 113,800 tons, and the breeding area was 32,648 hectares. Its commodities are mainly sold live or made into semi-finished products to supply the market. Blue crabs have the biological characteristics of molting 13 times in their lifetime. The molting cycle is related to the age and weight of the crab. Each molting increases the weight by 30%. The freshly molted crab meat is tender and plump, and the business opportunities of soft shell crabs are also abundant. born. In order to expand the sales market and increase the profit of commodities, farmers adapt to the eating habits of consumers in Europe and the United States and the psychology of eating hard-shell crabs, some countries such as Vietnam, Thailand, Myanmar, Mal...

AI Technical Summary

Problems solved by technology

Although the above-mentioned soft-shell crab farming has achieved certain success to varying degrees, they are all at the stage of indoor factory farming, and the cost of farming is expensive, which affects the expansion of the sales market.

At present, the market price of hard-shell mud crab is about 100 yuan / kg, and that of soft-shell crab is about 380 yuan / kg, which is much higher than the international market price. The products mainly enter high-end restaurants, which is difficult for ordinary citizens to accept.

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