First, the reason
1, feeding bait too fine, especially animal food too much, coupled with a rich source of natural food bait in the cultivation pool, so that the growth of gluttonous crab on the one hand to speed up the growth of a part of the formation of crab species, on the other hand Promotes precocious puberty.
2. The effective accumulated temperature increases, which accelerates the development of gonads. Especially when ponds and paddy fields cultivate crab species, the water level is shallow and the water temperature rises faster than lakes, rivers, grass and other large water surfaces. In addition, the cultivation of crab species is generally in the summer and autumn high temperature season, the water temperature has been high, thus accelerating the growth of crab species and gonadal development.
3, natural crab seedlings do not start until early June, and the general population of seedlings generally can emerge at the beginning of March, the growth period than the natural seedlings extended 2 months and 3 months, plus the plastic shed to strengthen the cultivation, so that the crab The out of specification is larger. More precocious puberty.
4, crabs or v juvenile crab stocking density is too thin.
Second, sexual maturity characteristics
1. The abdomen of the female crab has become sexually mature in the umbilicus; the male crab-transplanter becomes a rigid, osseous tubular body, and the dense hair of the crab is longer, and the darker color is sexual maturity.
2. Sexually mature crabs are uneven on the back.
3, open the crab's head A, such as in the liver area to see two purple strips, and there are eggs, or there are two white mass that is the testis, it shows that the gonads are mature.
Third, preventive measures
1, due to water conditions, control feeding, in particular, to control the amount of Animal Feed.
2. Increase the water depth of the cultivation pool appropriately, and change the water in the hot season. It is better to use the water in the river channel and the lake to reduce the water temperature.
3. In the cultivation pool, the removal of water plants with a coverage rate of 50% reduces direct sunlight and reduces the effective accumulated temperature of the growth of crab species.
4, as far as possible the use of human seedlings in May for the cultivation of crabs, 3-4 months of people can be used for seedlings to develop into the year.
5, appropriately increase the stocking density of crabs, generally more than 1/3 of the normal breeding of crab breeding stocks.
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