First, strengthen feeding. During the hibernation of wintering crabs, feeding should be strengthened to allow the crabs to accumulate certain energy for consumption during their dormant period. Feeding mainly animal feeds, such as sea (light) water mixed fish, shrimp, clam meat, snail meat, cocoon, fish meal, insect larvae, zooplankton, silkworms, etc., can also be fed added Artificial diets for animal foods. To extend the feeding period as much as possible, do not stop feeding prematurely due to a decrease in overall food intake. Second, regulate water quality. Crab species have higher water quality requirements than fish species and are more sensitive to water pollution. Crab species prefer to live in slightly alkaline or neutral waters with clear and transparent water quality. The suitable pH for pool water is 7-9, and the optimum is 7.5-8.5. If the pH is too low, crab shells are difficult. The pH will be high and low, too big will affect the shell. The pool water level should not be less than 1 meter and the dissolved oxygen should be kept above 5 milligrams per liter. Dissolved oxygen is too low and can cause crabs not to eat or clam shells. Third, disease prevention and heat preservation. Crabs have a weak ability to drill holes on their own. For the pond culture environment, it is more difficult for crabs to drill holes in winter. The following remedial measures can be taken according to local conditions: (1) deepen the water level, increase the coverage and depth of aquatic plants (water peanuts, etc.); (2) artificially insert nests, such as a pond with crab islands, can deepen the water level after building a nest with bricks and tiles on the island. , so that the nests are immersed in water for the habitat of crab species; (3) a wind wall or straw is constructed on the back side of the pool, and the plastic film can be covered on conditionally.
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