Crabs are generally collected from the beginning of October to the end of November every year, so the price is low and the breeding efficiency is not high. Raising crabs in the winter is beneficial to staggering the season of listing and marketing and raising the market price of crabs so as to obtain the best economic benefits. 1. The pond requires an area of ​​5 to 10 mu. The pool water level should be maintained at 1.5 meters or more. The water source is good, and the water inlet and water drainage are convenient. The pool sinks are not leaky. The pool surface is 2 to 3 meters wide and the bottom sludge is 15 cm or less. 10 days before entering the pool, river crabs clear the pond with quick lime, and after 7 days water is stocked. The crabs were bred in pools before entering the pool. 2.Quality and Quantity Requirements The crabs to be maintained need to be free of disease, injury, complete appendages and strong vitality. The individual size is about 120 grams, 500 to 600 kilograms per mu, and the water plants such as peanuts and hyacinths must be placed in the pond. And appropriate amount of snails to keep crabs from falling out during feeding. 3. The feed is fed to the local conditions to select baits, such as fruits, vegetables, bean cakes, aquatic plants, cooked hawthorn, wheat and chopped small fish, cockles, livestock processing plants, etc., animal and vegetable bait matching investment Feeding mainly animal feed, supplemented by vegetable feed, including animal feed accounts for 60% to 70% of the total feed, when the water temperature is higher than 10°C, the daily feed is about 10% of the crab weight , In two feedings, 30% to 40% of the total daily amount in the morning and 60% to 70% in the afternoon. When the water temperature is lower than 10°C, the amount of bait is reduced by 3% to 5% until the hibernation is stopped. 4. Water Management The crab enjoys a fresh water environment with a transparency of about 40 cm, a pH of 7.5 to 8.5, and a dissolved oxygen of 5 mg/L. During the maintenance period, a certain water level should be maintained, and the depth of pool water should gradually increase as the temperature decreases. In order to ensure that the pool bottom maintains a high water temperature in cold weather, the water depth should not be less than 1.5 meters. The water should be changed frequently. When the water temperature exceeds 10°C, one-third of the pool water should be replaced every 7-10 days (large pool) or 3-5 days (small pool). When the water surface is icing on a large area, ice should be added to increase oxygen. Small ponds should often increase oxygen. 5. The patrol pond inspects the water level. Maintain good water quality and adequate dissolved oxygen. Secondly, check the activity, feed it properly, ensure that it is eaten and eat well, and remove spoilage food in a timely manner to keep the water fresh. ( Puyang Linshi Medical Supplies Co., Ltd. , https://www.linshimedicals.com