Chongming old hairy crab, also known as Chinese mitten crab, is commonly known as the "old hairy crab" because its two large stalks are full of fine fluff, and the shape has the characteristics of "green back, white belly, golden claws, yellow hair". It is one of the most famous local products in Chongming District, Shanghai.

Chongming old hair crab quality technical requirements (a) water source and water quality. 1. The water source is sufficient, the drainage is convenient, and there is no pollution. 2. Main physical factor indicators of water quality: transparency 30 cm to 50 cm. 3. Main chemical factor indicators of water quality: (1) pH value is 7.5 to 8.5; (2) dissolved oxygen is not less than 4 mg/L per year; (3) total hardness is 5 mg/L to 8 mg/L; (4) salinity At 0.2 to 0.5. (2) Pond conditions. The light is sufficient and the pond is east-west. The area of ​​the crab culture pond should be no less than 2000m2, the depth of the pond is 1.5m to 2m, the water depth is 1m to 1.5m, and the pond slope ratio is 1:2 to 3. (3) Breeding. 1. Water-grass transplant: The plant-based feed for transplanting crabs mainly includes water peanuts, duckweed, Elodea, and bitter grass. Before transplanting the aquatic plants into the crab pond, they should be soaked in the flowing water for 1 to 2 days, and disinfected with 3ppm bleaching powder. The crab grass water coverage rate is over 40%. 2. Crab stocking: (1) Crab species are Chinese mitten crabs in the Yangtze River system. (2) Stocking specifications: not less than 80 per 500 grams. (3) stocking density: less than 800 per acre, crab stocking should be placed at one time. 3. Feeding: (1) Type of bait: animal bait, botanical bait or compound feed that is not used as a raw material for mammals. (2) Feeding amount: The feeding amount is 5% of the total weight of the crab in the pond, and it is flexibly controlled according to the climate, water quality, food intake, and disease occurrence. In a certain range of water temperature (10 ° C to 30 ° C), the water temperature increased with the increase of water temperature. When the water temperature was above 30 ° C, the food intake of crabs decreased. When the water temperature was lower than 6 ° C, the feeding of crabs basically stopped. (3) Method and number of feeding: The feeding should be followed by the whole pool, focusing on the principle of surrounding. The number of daily feedings is 2, and each morning is 1 time. In the morning, it accounts for 30% of the total daily feed, and in the evening, it accounts for 70% of the total daily feed. (4) Banned bait: It is forbidden to use bait raw materials produced by transgenic method; animal bait products using mammals as raw materials are prohibited; industrial synthetic oils are prohibited; animal husbandry feces are prohibited. 4. Water quality regulation: (1) Every 3 to 5 days in the high temperature season, new water should be replenished, and the bottom part of the sewage should be discharged. The control water level should be between 1.2m and 1.5m. When the water is drained, the temperature difference of the pond is controlled at 3°C. between. 5. Prevention and treatment of crab disease: (1) Prevention should take the following measures: dredging and disinfection of dry ponds; transplanting water plants and stocking snails; quarantine and disinfection of seedlings; regulating water quality and improving sediment quality. (2) Prohibition of fishery drugs: It is forbidden to use fishery drugs containing genetically modified products, teratogenic, carcinogenic, mutagenic, and slow in metabolism. Synthetic hormones and growth promoters are prohibited. (4) Crab fishing. 1. Crab growth period: a growth cycle greater than 180 days. 2. Fishing time: Start fishing in October of each year and catch it. (5) Quality characteristics. 1. Sensory index: Item indicator body color green back gray belly, yellow hair golden claws. The appearance of the crab shell is smooth and clean, and the surface of the head breastplate has a ridge-like protrusion, which is intact and slightly smaller. Steps are full of cheeks and appendages. The smell is odorless, tender, fresh and full. The physical constitution is strong, the activity is strong, and the reaction is quick. The live crab is live, the muscles are tight and elastic, and it is translucent. 2. Physical and chemical indicators: the grade of the first-level male crabs, female crabs, female crabs, and the percentage of body weight, %≥3.0≥8.0≥2.0≥7.0 moisture, /cm3≥0.61≥0.51≥0.57≥0.46 %≤69.5≤58.0≤74.0≤63.0 ash,%≥6.3≥7.7≥5.0≥6.0 protein,%≥15.5≥16.5≥14.0≥15.0 fat,%≥6.2≥7.5≥5.0≥6.1

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Producers within the scope of protection of Chongming's old crab crab geographical indication products may apply to the Chongming County Quality and Technical Supervision Bureau of Shanghai for the use of the \"Special Mark for Geographical Indication Products\", which is approved by the General Administration of Quality Supervision, Inspection and Quarantine.