In 2009, Fanji Town, Chuzhou District, Huai'an City, entered the China Breeding Farm with polyculture of crayfish and crabs, and cultivated an area of ​​1,000 mu. A total of 55,000 kilograms of crayfish were harvested, with an average yield of 55 kilograms per mu; 40,000 g/body of crabs were 40,000 kilograms, and an average yield of 40 kilograms per mu; carp 0.6 million kg, an average of 6 kilograms per mu, and 20,000 kg of carp. The average yield of 20 kilograms per mu.
Pond conditions pond formation is generally rectangular, it can also be an irregular polygon earth pool, an area of ​​3-4 acres is appropriate, the pond water depth of 0.8-2 meters, the pool slope ratio of 1:1.5-2.5, shallow water area and deep water area within the pool or more Deep "well" shape or "back" shaped ditch, and equipped with microporous aeration facilities in the pond. Drainage pipes were set up on both sides of the pond, and the area covered by the bottom of the pond was about 60%.
Anti-escape facilities have established anti-escape fences around the ponds. They are usually made of mesh sheets, plastic films, fiberglass tiles and calcium plastic panels. The height of the general fence is 60 centimeters, 20 centimeters of which are buried in the mud and fixed with bamboo piles, and the pile spacing is 1.2-1.5 meters.
The caviar seedlings were put into the seedlings, and the broodstock cultivation practices were conducted in the last year. The average number of broodstock shrimp per mu was 10-15 kg. About two months later, the crab species were placed and a total of 120 larvae were allocated. 480,000, an average of 480 per acre, and 30 per catfish with 30 fish per kg, in mid-May, 5-7 cm long carp seedlings of 1-2 fish per mu.
Feed Feed In addition to supplying 300,000 kilograms of live snails before Ching Ming to ensure the normal supply of crawfish and crab live feed, pellet feed is used throughout the entire production process. According to the different growth periods of river crabs and crayfish, feeds are fed timely. In mid-April, formula 1 material and formula 2 material will be fed. After about 1 month, the feed will be fed with a crushing feed with a particle diameter of 16 mm. When the crayfish and crabs grow, they can normally feed the crab formula feed. Feed 2 times. From June to July, according to the reservoir situation of snails, 100-150 kg of mussels were used per mu.
The water quality management regularly changes the water, and the transparency of the pool water is maintained at about 30 cm in the early period of cultivation, and is maintained at about 40 cm in the middle and later periods. The water quality improvement agent is regularly used to improve and purify the water. Aerators can be turned on at a proper time. When the weather is hot, the whole pool can be splashed with microbial preparations to improve the water quality. If it is found that there is not enough water in the bottom of the pond, 0.5-1 kg of compound fertilizer per acre can be used to promote the growth of aquatic plants.
At the end of February, broodstock was caught in the ground cage and crayfish were caught. In June, 30-35 g/tail crayfish were caught. The crabs were harvested and marketed in mid-September.
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