2. Build a crab pond. Generally, crab ponds are required to be built 15 days before stocking crab species. There are many forms of crab ponds. Some dig deep water around to make dikes, shallow water in the middle, and some dig many small ridges in big ponds. This paper introduces a concave crab pond, that is, a crab pond with deep water dug in the middle, shallow water dug around and diked on the side. Each pond is more than 5000 square meters, and the excavated soil can be used to build a ridge around it. It is required that the ridge top width is greater than 1m, the slope ratio is greater than 1∶2, the middle deep water area accounts for about 2/3, the pool depth is 1.52m, and the water depth can be maintained at 3040cm. Set up high irrigation and low drainage system, and purchase cheap and applicable materials to build escape prevention facilities, such as bricks, calcium-plastic boards, cement boards, asbestos boards, glass fiber reinforced plastics and plastic films.
3. Clean the pond for disinfection. For ponds where crabs are identified, clean the ponds before transplanting aquatic plants. The water depth of the pond is 10 15cm, and 75kg of quicklime is used for every 667m2 (1mu). After dissolving, it splashed all over the pond. 10 after spraying, put the young crabs in after the medicinal properties disappear. You can also use bleach to clean the pond. Water depth1m. Use bleaching powder 13 15kg containing 30% available chlorine every 667m2. After dissolving, it splashed all over the pond. The medicinal properties disappeared 5 days after cleaning the pond, and the young crabs could be released 8 days later.
4. Build an escape wall. It is better to use a brick escape wall outside the dike at a distance of 0/.5 meters from the crab pond/kloc-0. When building the escape wall, the sunrise side can be built 3 meters away from the water, and the escape wall should not be too close to the water. The foundation of the wall should be buried 20 cm and 80 cm above the water surface, and a pile should be built every 4 meters outside the wall to strengthen the fence. The top should protrude inward from the "factory"-shaped cornice 15cm, and the inner wall should be polished with cement, and the corner should be made into an arc angle instead of a right angle, so that the crab has nowhere to climb.
5. Breeding and feeding. Crabs are omnivores. If possible, you can feed them with red nematodes and egg yolks. Of course, crabs can also eat chicken and duck viscera or small fish and shrimp. At the same time, feed some grass. Pay attention to the amount of food, eat it in half an hour, or the rest of the food will pollute the raised water.