Crab cultivation. In order to improve the survival of young crabs and increase economic benefits, it is necessary to cultivate crabs first. At present, in order to make the big-eyed larvae reach the commercial crabs, the temporary rearing technology in plastic greenhouses is mostly adopted. Choose good water quality and sufficient water source; Note: The pond with convenient drainage, no water leakage, no water seepage and little silt should not be too large, and the water depth should not exceed1.2m. The east-west direction of the pond is better, and there is plenty of sunshine. For greenhouse construction, please refer to the construction method of agricultural vegetable greenhouse. 　　

Before releasing crab seedlings/0/5-20 days in Kloc-0, 75 kilograms of quicklime should be sprinkled and disinfected per mu. After the medicinal properties disappear, water should be fed through a 80-mesh filter to cultivate basic bait, transplant aquatic plants (which must be strictly disinfected) and set up necessary escape prevention facilities. Crab seedlings can be shallower when entering the pool. Conducive to improving the water temperature and the growth of algae and aquatic plants in the water. Feed bait 2-3 times a day, and feed soybean milk, fish, shrimp paste, etc. With the growth of young crabs, some plant bait should be added. After about 2 months of cultivation, crabs can be detained.

Pond conditions. Adequate water source, convenient water intake and drainage, good water pollution, clay, sandy soil or sub-sandy soil with good ventilation, which is beneficial to the growth and reproduction of aquatic plants, benthic insects, snails, water worms, etc. The old pond should be thoroughly dredged, and the silt should not exceed 20cm, and the pond area should not be too small. The water depth of the pond is kept at about 0.6-1.5 meters all the year round, and the water depth varies from place to place. At the shallowest point, 10cm, several mounds slightly above the water surface can be built in the pond, that is, crab island, where aquatic plants can be transplanted. The pond should not be too steep, and the slope ratio is generally 1: 1.5.

Transplant aquatic plants. For river crabs cultured in ponds, great efforts must be made to plant aquatic plants. Our species of aquatic plants mainly include duckweed, Azolla, water hyacinth, water hyacinth, hydrilla verticillata, Ceratophyllum demersum, Sophora alopecuroides, Alternanthera philoxeroides, etc., and attention should be paid to disinfection and prevention when transplanting.

Escape prevention facilities. Escape prevention facilities mostly use plastic film, but also useful cement board, depending on their own situation.

Clean the pond and disinfect it. Generally, the pond is disinfected with quicklime half a month before the seedlings are released, and the dosage is 75 kg per mu.