The cultivation pond is mainly a cement pond with an area of 20-40 square meters and a water depth of 0.6-0.8 meters. You can also choose a pond with good water quality near the water source and build drainage and escape prevention facilities. Before releasing seedlings, the pond is strictly disinfected, and basic fertilizer is applied to cultivate plankton to provide open bait. The area of transplanted aquatic plants accounts for 30% of the water surface. Put 0.8 cm juvenile shrimp10-150,000 per mu. At the early stage, natural bait was mainly used, and soybean milk and minced fish were properly fed. With the growth of individuals, artificial feed was mainly used.

2. Pond culture

Put young shrimp 1- 1.5 million per mu, sprinkle quicklime regularly to increase the calcium content in the water, and increase the amount of feed at night, mainly with compound feed.

3, fry stocking

There are two ways to raise crayfish: first, put the shrimps directly into the rice field in the first ten days of September after the rice is harvested, and let them breed by themselves. According to the actual situation of rice field culture, generally, 20 kilograms of crayfish with individuals of more than 40 grams per acre are raised, and the sex ratio is 3:1. Second, after rice seedlings are planted in May, young shrimps with the size of 2-4cm1500-2000 or 30kg/mu are put in. When crayfish are stocked, attention should be paid to the quality of young shrimps, and the stocking specifications of the same field should be as neat as possible, and they should be fully stocked at one time. Stocking in sunny morning or rainy day, and disinfecting with 3% ~ 4% salt water bath 10 minute when stocking young shrimp.

Extended data

Strengthen disease prevention and control

Crayfish has exceeded the growth temperature in high temperature season, so it should be well managed to resist stress. Vitamin C should be sprinkled all over the pond in the afternoon, and 250 ~ 300 grams should be used per mu 1 meter of water depth.

1, prevent shell rot. There are obvious ulceration spots on the shell and pincers of diseased shrimp, which are gray-white, dark brown when severely ulcerated, and the middle end of the spots is sunken. The disease is caused by infection of shrimp with Pseudomonas, Aeromonas, Myxobacteria and Solitary Bacteria. The quicklime can be dissolved regularly and then sprinkled in the whole pond, and the water exchange capacity can be appropriately increased to improve the aquaculture water quality. 1% calcium dihydrogen phosphate can be added to the feed for 3 ~ 5 days.

2. Prevent brown spot disease. The crustacean of diseased shrimp has spotted black-brown ulcer, which often lies by the pool and is in a state of dying. The disease is caused by shrimp injury and environmental degradation pathogen infection. Every year, the pond can be dredged to keep the water quality of the shrimp pond good, and the water can be changed regularly or quicklime can be sprinkled all over the pond. Be careful in the process of fishing, transportation and stocking to prevent damage to shrimp shells. When shrimps are found to be sick, 0.3g of dibromohydantoin is used in the whole pond for every cubic meter of water, and nitrifying bacteria 1 g is used in the whole pond for every cubic meter of water after 3 days; Every kilogram of shrimp in the pond is sprinkled with10 ~15 mg of tea meal liquid to promote shrimp to shed their shells and repair damaged crustaceans.

3, bacterial enteritis. Feeding management should be strengthened to make the pool water weakly alkaline and fully dissolved oxygen, and the measures of "four elimination and four determination" should be strictly implemented to deepen the pool water to make the water temperature change less. Spraying 5 ~ 6 kilograms of quicklime per mu of water surface or 0.5 grams of chlorine dioxide per cubic meter of water in the whole pool has obvious therapeutic effect.

References:

Baidu encyclopedia-crayfish