Eriocheir sinensis juvenile crab whole process automatic graded raising technique

Abstract

The invention discloses an eriocheir sinensis juvenile crab whole process automatic graded raising technique, which can increase the survival rate of the eriocheir sinensis by over 15 percent and keep the premature rate of the eriocheir sinensis below 5 percent and lazy crab rate below 2 percent; and when the technique is used, the average acre yield of standard crab species is over 220kg, which is 25 percent higher than that of the conventional raising mode, and after the crabs are caught, lots of time and labor for manual sieving and grading can be saved, and certain labor cost can be saved. The key point of the technique is that the eriocheir sinensis juvenile crab whole process automatic graded raising technique comprises the following steps: 1) a raising pond preparation; 2) daily domestication; 3) automatic grading; and 4) graded management and growth regulation.

Description

technical field [0001] The invention relates to a breeding technique for crabs, in particular to a breeding technique for Chinese mitten crabs. Background technique [0002] Chinese mitten crab (Eriocheir sinensis), commonly known as river crab and hairy crab, is an important economic crab in my country. Because of its unique flavor and rich nutritional value, it is deeply loved by consumers and has a huge market demand. River crabs are aquatic crustaceans, and their growth is accompanied by moulting, and every time they moult, their body weight will increase by leaps and bounds. During the breeding process from megalopa to first-year-old crab species, river crabs need to complete 8 to 11 molts. However, due to the different growth rates of individuals and asynchronous molts, the size differentiation among individuals is serious, and there are obvious differences in the population in the middle and late stages of breeding. This leads to a series of problems: [0003] (1) T...

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Problems solved by technology

[0003] (1) The molting is not synchronized, the size is not neat, and the large crab group suppresses the small crab group from the competition for food and living space, resulting in the slow growth of the small and vulnerable group, weak resistance to stress, and many stop growth "lazy crabs", seriously affecting the output of so-called standard crabs;

[0004] (2) Large crabs eat small crabs, resulting in a high mutual mutilation rate and reduced survival rate;

[0005] (3) The dominant group with large size has strong competitiveness, grows too fast, and is prone to premature maturity. Too many "early-maturing crabs" will relatively reduce the production efficiency of crabs

[0006] (4) It is difficult to realize the nutritional regulation of crab species with different specifications

[0007] (5) It is difficult to meet the needs of the market, and it needs to be artificially screened and graded, which is time-consuming and laborious

[0008] The above-mentioned problems directly or indirectly affect the output and economic benefits of the production of mitten crab species, hinder the improvement of the production efficiency of mitten crab species, and are not conducive to the further development of the crab species breeding industry

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