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How to use seawater ponds to culture crabs? What steps should be taken?
Pond choices and facilities: Ponds can be large or small. The general requirement is a standardized pond that requires a water depth of 1.5 meters. The bottom of the pool should be sanded or partially sanded to a thickness of about 10 cm, and concealed objects can also be installed at the bottom of the pool, such as sand piles and tile drums to reduce self-mutilation. The pool water can be drained for easy harvesting. The shuttle crab has no drill hole and no escape ability. Therefore, it is only necessary to use a fence to block the entrance and exit gates. Farming form: divided into two modes: single-cultivation and polyculture. 1. For single-cultivation, small ponds should be used, usually within 10 mu. The juvenile crabs began to be stocked in June and can be polycultured by males and females. The general male-and-male stocking of crab species is released from August to October or later, and it is mainly fattening or temporary raising. 2. Polyculture is the main form of current pond-cultured swimming crabs. Generally, it can be mixed with prawns, cockroaches, loach, and fish or blue crabs. The time and method of planting seedlings are the same as above, whether monoculture or polyculture, the best The ponds were divided into multiples with polyethylene mesh cloth, and the fence should be about 50 cm above the water surface, so that the crabs, crabs, or male and female individuals of different sizes can be kept alive for raising and fattening, which can reduce the number of killing each other. The stocking density of crabs or crabs: According to factors such as pond conditions, climate, seed quality, specifications, and polyculture varieties, general stocking is from tens to hundreds of seedlings of 500-3000 birds per mu. The main link management: 1, the ponds should be dredged and disinfected before entering the water. Disinfect the main drugs using lime and bleach, tea cakes. Clear pond time is 15 days before stocking. The ponds of other varieties of oysters and prawns that have been mixed shall be cleared of ponds before they are stocked. 2. The feed is fed twice a day, once in the morning and evening, and the amount of feeding is 5%-8% of the body weight. The feed can be fresh or frozen fish, shrimp or low-value shellfish. The water temperature drops below 8°C. Need to feed. 3. The water quality management during the growing season is the key to reducing the incidence of swimming crabs and improving the survival rate. The general requirement is: the water color is green tea and yellow brown, and the water level should always be kept above 1 meter, and the water salinity should be 10.5%-34%. , PH value of 7.8-8.5, according to different periods of time to change the water or appropriate amount of water, keep the pool dissolved oxygen, can be quick lime every 15-30 days. 4. According to the growth condition of the crab, individual individuals of different specifications can be cultured in a separate pond until September to October, and the male and female are separately reared for rearing.