The artificially cultured crabs breed in April every year, turn into buckled crabs in June 5438+ February of that year, and put them in big ponds in the next year, so they can be put on the market ten days before the Mid-Autumn Festival at the earliest, so the whole breeding cycle of crabs is less than 1.5 years.

Precautions for raising crabs:

1. Pond conditions: Clay, sandy soil or sub-sandy soil with sufficient water source, convenient water intake and drainage, good water pollution and good aeration are beneficial to the growth and reproduction of aquatic plants, benthic insects, snails and water worms. The old pond should be thoroughly dredged, 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- 1.5m all the year round, and varies from place to place, with the shallowest point 10cm. Several mounds 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 below 1: 1.5, otherwise crabs are easy to dig. You can also build artificial caves.

2. Transplanting aquatic plants: The natural yield of crabs mainly depends on the number of aquatic plants and benthic organisms (food organisms) in the waters. In the process of aquaculture, it is an indispensable technical measure to plant aquatic plants well. Planting aquatic plants can not only feed crabs and supplement vitamins for ten days, but also support mutual fighting and concealment, which is a powerful measure to improve the survival rate of crabs at all stages. In addition, it can absorb harmful ammonia nitrogen, carbon dioxide and organic matter in the pool, release oxygen and stabilize water quality. The masses often say that "the size of crabs depends on aquatic plants." Therefore, for crabs cultured in ponds, great efforts should be made to plant aquatic plants. Aquatic plants mainly include duckweed, red duckweed, water hyacinth, water hyacinth, black algae, Ceratophyllum, Sophora alopecuroides, water peanuts and so on. Attention should be paid to disinfection and prevention when transplanting.

3. Anti-escape facilities: The anti-escape facilities are mostly made of plastic film or cement board, depending on their own situation.

4. Cleaning and disinfection of the pond: Generally, the pond is disinfected with quicklime half a month before the seedlings are released, and the dosage is 75 kg per mu. On the one hand, it can kill pests, on the other hand, it can improve the bottom of the pond, increase the content of calcium ions in the water and promote the growth of crabs. Fertilize in time after receiving water to cultivate algae and basic bait, and the transparency is generally maintained at 40-50 cm. If tadpoles or frog eggs are found, they should be taken out in time to avoid competing for food and hurting young crabs.