I. Selection and clearing of crab ponds: (1) Water source quality: The required water sources are sufficient, no industrial sewage and domestic sewage flow in, the water quality requirements are in line with the national "fishery water quality standards"; (2) the crab pond bottom quality: preferably sandy loam and clay, ponds Bottom silt is not more than 20 cm thick; (3) Area and water depth: The crab pond area is suitable for 5-50 mus, and the water depth is 1.5-2 m; (4) Clear pond: After the crabs are collected in the previous year, the pool water is drained and dug off. More silt, frozen ponds and clear ponds. Qing Tang drugs can choose tea, lime and so on. Second, transplanting plants, put snails. (1) Transplanting plants: In March, we transplanted weeds, mainly yellow grass and Elodea, and with other species, the growth area of ​​aquatic weeds should account for about 50% of crab ponds; (2) Putting snails into circulation: fresh snails were put in mid-April, About 500 kg per mu, to ensure the purification of crab pond water quality and crab feeding needs. Third, crab species stocking. (1) The crab species should be selected from the orderly and tidy, swift crawling, non-injurious, disease-free Yangtze River water-borne Chinese velvet crab species, and the specification should be 150-200 pieces per kilogram, and the stocking density should be about 600 per mu. Fourth, carp species stocking. In May, select 5 to 8 centimeters of high quality carp species, stocking 10 to 15 fish per acre. Fifth, production management. The production and management of polyculture of squid in crab ponds are conducted in accordance with the routine management procedures for crab breeding production. Generally, no additional feeding and disease prevention measures are required for squid. Through one cycle of feeding, 5-8 kg of squid per acre can be produced without affecting the yield and weight of the crab. The individual weight of the squid can reach about 0.5 kg.
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