In recent years, Jinhu County, Jiangsu Province has implemented crayfish as the main push species in the implementation of the Fisheries Technology “Huimin Project†and actively promoted new models and technologies for crayfish breeding, and achieved good promotion effect and economic benefits. At present, it has become a new growth point for local fishery economic development and has been generally welcomed by fishery (agricultural) people. Based on the practice of the local freshwater crayfish breeding, the author summarized and introduced several breeding models, as follows, for reference by farmers. Crayfish main mode The crayfish main mode refers to the cultivation of crayfish mainly in the pond, and it is reasonable to stock some of the large-sized species of carp to regulate the water quality and increase the comprehensive breeding efficiency. There are two kinds of crayfish stocking mode: one is the autumn shrimp species. Stocking specifications range from 20/kg to 30/kg, with a male to female ratio of 3?1, and a density of 25 kg/mu - 30 kg/mu, from August to September. In March and May of the following year, the species of shrimp that have already been bred will be caught and sold in a timely manner. Shrimp will be kept in the pond for shrimp farming. The other is spring stocking of shrimp. Stocking specifications range from 200/kg to 300/kg, and the density ranges from 30 kg/mu to 40 kg/mu, from March to April. The stocking specifications for quail and trout are 4 tails/kg -6 tails/kg, and the density is about 200 tails/mu. The time is in May. Crayfish started catching in June, catching big and small. The squid is caught in a dry pond when crayfish farming is finished. According to Wei Ailiang, a demonstrator of Qianfeng Town, the model can harvest 150-200 kg of crayfish and 250-300 kg of cod on average. Crayfish and crab polyculture pattern Crayfish and crabs belong to the same crustacean species and have similar food habits. They also have the same residual characteristics. Therefore, compound aquatic plants should be planted in breeding ponds, and the water grass coverage should be over 60%. Aquatic grass can be used not only as a botanical food for crabs and shrimps, but also as a habitat, shell, and shelter. According to Zhang Degao, a technical instructor at Tajikistan, there are two types of stocking methods. The first is to use crayfish as the main stockbreeding method, and crayfish as the mainstay. The stocking size of the shrimps is 200/kg-300/kg, the density is 30 kg/mu - 40 kg/mu, the time is February - March, and the stock size of the crabs is 60/kg - 100/kg. (Large-size species of crab that have been intensively cultivated in Xiaotangkou or in special areas), with a density of 200 animals/mu - 300 animals/mu in May. The method can harvest 150kg-200kg of crayfish and 25kg-30kg of crabs per acre; the second method is to use river crab as the main breeding stock, and the main management is crabs. The stocking size of crabs is 150/kg-200/kg, the density is 600/mu-800/mu, and the time is from February to March; the stocking size of shrimps is 200/kg-300/kg The density is about 2000 tails/mu, and the time is from late April to early May. The average mu harvest rate is about 80 kg for crabs and 40 kg -50 kg for crayfish. Crayfish and adult fish polyculture mode The stocking size is 20 fishes per kilogram per mu, including 1200 to 1,500 fish tails, 15 fishes/kilograms to 20 fishes/kilograms, 500 to 600 fishes, 4 fishes/kilograms to 6 fishes/kilograms 100 species - 200 tails, stocking time March - April; shrimp stocking specifications of about 3, the density of 4000 tail / acre - 5000 tails / acre, time from the end of April to early May. The mode of cultivation and management of this model is dominated by adult fish. Crayfish are caught in cages and cages from the middle and late June to catch large fish. According to the market conditions, the fish will be exported before and after the end of the year. According to the data from Tangkou of Lihongxiang, a sample farm of fish farms in Jinhu County, this model can harvest 1,000 kg to 1200 kg of adult fish and 80 kg to 100 kg of crayfish on average. Crayfish and fish species polyculture mode The mode of polyculture between crayfish and fish species is based on fingerling cultivation. The shrimp stocking specifications are about 200/kg, and the density is about 2500/mu. The time is at the end of March or early April. Summer fish species were released in June. The stocking species were mainly quail, cod, and squid. The stocking density of squid summer flower is 12000/mu -15000/mu, the stocking density of squid summer flower is 2000/mu - 3000/mu and the stocking density of squid summer is 2000/mu. Before entering the pond, summer flowers were mainly cultured with crayfish and fed crayfish with compound feed. Summer flowers were mainly fed with fingerlings and fed with fingerlings. Crayfish can start fishing from June, catch large and small, two to three months time can basically catch the pool shrimp. The fish species will be caught for sale at the end of the year or wintered in ponds. According to the typical experience of Ding Tinghua, the head of the aquaculture farm of Yongqiao Town, the model can harvest 50kg - 60kg of crayfish and 1,000kg of fish on average. Wutang nesting crawfish model The nesting of crayfish in Qiangtang is a new mode of production in which crop farming and aquaculture use each other and complement each other. Select the pods with short stems and stems, rapid growth, crisp branches, crisp and tender meat, and high quality and high yield. The planting density is 600 plants/mu - 700 plants/mu, and the time is in the middle and late April; the stock size of crayfish is 200 tails/kg, with a density of 3000 tails/acre - 4000 tails/acre. The time should not be too late. If the shrimp seedlings are released too early, they will easily cause axillary bud injury, which is generally controlled in late May. Xu Chengxu, Technical Instructor at Baoyinghu Farm, explained at the technical exchange meeting that the average mu harvest rate for this model can be between 1000kg and 1300kg for lotus and 80kg for crayfish. Paddy field crawfish In the paddy fields, crayfish are nested, and the ditch is excavated around the rice fields. The shallow water environment of paddy fields is used to grow both rice and crayfish. It is an ecological farming mode that improves the comprehensive benefits of the unit area. Rice seedlings were planted from late April to early May. The seedlings were planted and transplanted from the end of May to the beginning of June. The planting methods of shallow water, broad rows and dense plants were adopted, and the planting densities on both sides of the inner side of the field ridge were appropriately increased. To exert marginal advantages. The crayfish stocking size is 200/kg-300/kg, and the density is 3000/mu-4000/mu, from April to May. Zhang Ronggui, director of the Fuyin Village in Yinji Town, introduced the visitors to the site. The average harvesting rate for this model is 500 kg – 550 kg for rice and 80 kg for crayfish. Food additives refer to chemical synthetic or natural substances added to food for the purpose of improving the quality, color, aroma and taste of food, as well as for the need of preservative and processing technology. 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