Strengthening the management of crab species in the autumn can increase the survival rate of crab species and reduce the cost of adult crab cultivation. The species of crabs is small in size, and the survival rate is low in winter; large in size, some crab species will develop mature gonadal, and will naturally die in the growing season without feeding value. Therefore, the key to the production of autumn is to cultivate suitable crab species.
The amount of appropriate feeding crab species is too small, and more animal feeds can be fed, such as small-sized fish, snail meat, silkworm cocoon, animal blood clots, etc., in order to increase the size of crab species and improve the cold-resistant ability of crab species. If the size of crabs is too large, the amount of animal feed should be controlled to reduce the accumulation of nutrients in crabs and inhibit the development of gonads in crabs. Can be fed in appropriate amounts of soybean, wheat, corn, pumpkin, hawthorn and other plant feeds to maintain the basic metabolism of crab species.
Adjusting water quality The autumn crab species requires fresh water, high dissolved oxygen, and a transparency of 30 cm to 40 cm. Change the new water every 5 days to 7 days, and keep the water depth more than 1.8 meters, so that the water temperature is stable at 25Â°C~28Â°C. Splash lime every 10 days to 15 days to disinfect the body of water, increase calcium, and meet the calcium requirements of dehusking crab species. A small amount of crab species was found ashore or crawling on aquatic plants and foaming at the mouth, indicating that the water body had been deprived of oxygen, and timely injection of water was required to increase the dissolved oxygen in the water body.
Transplanting aquatic crabs and planting ponds to transplant plants such as Elodea, Vallisneria, and water peanuts, and the coverage rate is stable at around 50%. Crab seedlings transplanting plants can reduce direct sunlight, reduce the effective accumulation of temperature in the growth of crabs, and inhibit the development of gonads in crab species. At the same time, aquatic plants are excellent plant feeds.
Disease Prevention Autumn crab species are susceptible to ciliate disease, gill disease and so on. In general, 0.5 g/ml bromochlorohydantoin is spilled once every 15 days and fed with 1% oxytetracycline every 20 days to prevent crab disease. In the case of ciliate disease, you can splash 2 mg/l zinc sulfate or 0.5 mg/l carapace in Quanchipia. Gill disease can occur in Quanchiposa 1 mg/L of Crabokang II. Every 50 kg of crab species is fed with 1% to 2% of leeches and baits and used for 3 days.
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