Male and female river crab separated pond culture method

Abstract

The invention discloses a male and female river crab separated pond culture method which enables male and female river crabs to be separated and adopts different culture modes in different culture ponds. The male and female river crab separated pond culture method ensures normal ingestion of the female river crabs, facilitates improvement of growing-out size of the female river crabs, promotes synchronism of river crab exuviation in the same ponds and facilitates improvement of the culture survival rate. Scientific feeding and management are performed according to different growth and development laws and nutritional demands of the male and female river crabs, a food coefficient is reduced, and the quality of adult crabs is improved. The crabs are caught and supplied to the market according to different mature times of the male and female river crabs, the reduction of the labor intensity is facilitated, crab hurts are decreased, and the culture and management level and economic benefits are improved.

Description

technical field [0001] The invention belongs to the technical field of aquaculture, and in particular relates to a pond culture method for separately raising male and female river crabs. Background technique [0002] river crab ( Eriocheirsinensis ), the scientific name is Chinese mitten crab, which belongs to the order Decapod, the family Crabidae, and the genus Eriocheir. Widely distributed in the brackish and fresh waters of the southeast coast of my country, it is produced from Liaohe River in the north and Oujiang River in the south. After rapid development in recent years, it has become a very important economic crab in my country. Jiangsu, Hubei, Henan , Shandong, Anhui, Liaoning, Xinjiang and many other provinces have breeding, the annual output has increased from 232,400 tons in 2002 to 796,500 tons in 2014 (China Fishery Statistical Yearbook, 2015), and the annual output value exceeds 40 billion yuan, of which The output of Jiangsu Province alone reached 358,200 to...

AI Technical Summary

Problems solved by technology

Judging from the current breeding practice, there are some disadvantages in mixed breeding of males and females: (1) male crabs have strong ability to grab food, while female crabs have weak ability to grab food, and it is difficult for female crabs to grab bait, resulting in smaller size of female crabs; (2) The moulting of male and female individuals is not synchronized, especially the last mature molt. Female crabs are usually about 15 days earlier than male crabs, which makes soft-shell crabs that are molting or have just moulted easily killed by other crabs, thereby reducing the survival rate; (3) Female crabs and male crabs have different nutritional requirements during gonad development, and there are also large differences in the development time and speed of the two crabs

Ovary development of female crabs starts after moulting at maturity (from mid-to-late August in the Yangtze River Basin), and the total fat content of feed needs to be more than 10%; testicular development of male crabs usually begins at the end of June, and the main part of the process is secondary after moulting. For the development of gonads, male crabs require about 6% total fat content in feed during gonad development, but they have higher requirements for protein content in feed, so mixed breeding of male and female crabs is not conducive to scientific feeding according to the different nutritional needs of male and female crabs; (4 ) Female crabs and male crabs have different market time. Since the gonad is an important edible part of river crabs, the gonad development of female crabs is close to maturity in mid-to-late October every year, and the gonad development of male crabs is close to maturity in mid-November every year. Usually, the time for female crabs to go on the market It is 10-11 copies per year, and the male crabs are on the market from November to December every year. Therefore, when the female crabs are fished by mixed sexes, it is usually necessary to remove the male crabs. This is not only inconvenient to operate, but also easily leads to damage and death of river crabs.

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