Blue crab, scientific name saw crab. It is delicious and nutritious. Sanmen County is the birthplace of blue crabs in Zhejiang Province and is known as the “hometown of blue crabs”. It is produced in the coastal areas, especially from Haiyougang to the serpent waterway. Coastal fishermen in Jiantiao have always used net catching. The locals call it “crabs and crabs”; the six-spot area is used as a “crab hole” to attract blue crabs into the clam shells, especially fat.

Sanmen County is located on the bank of Sanmen Bay in the east coast of Zhejiang Province. It is located in the southwest of Sanmen Bay. The geographical coordinates are 121°12′00′′～121°56′36′′ east, 28°50′18′′～29° north latitude. 11'48′′, Sanmen Bay is a semi-enclosed harbor with a twisted coastline, with a total length of 227 kilometers and a sea area of ​​500 square kilometers. There are 122 large and small islands along the coast. The total area of ​​the island is 42,000 mu. The island is dotted from north to south. Form a natural barrier. Therefore, the coastal waters are calm and the beach is broad and soft. There are 590,000 mu of shallow sea and 210,000 mu of tidal flats. The water system in the territory is known as the “Baxi Five Ports”. From the north to the south, there are Qimen Port, Haiyou Port, Jiantiao Port, Puba Port and Donggang Harbor. The inland is inland and there are Qingxi and Zhuyouxi along the coast. Eight major streams, such as Tingbianxi, Baixi and Shanchangxi, have a large amount of nutrients into the sea during the rainy season, resulting in fertile water in the coastal areas, moderate salinity, and abundant biological materials, which is conducive to the growth and growth of seawater organisms. According to the national seawater survey, Sanmen Bay contains 15.8 micrograms of nitrate per liter of water, 1.0 microgram of phosphate, 25.7 micrograms of nitrate, and 668 grams of plankton per cubic meter of seawater, the highest in the country. At the same time, the tidal current rate in the harbor is greater than the rising tidal current, and the sediment is rarely deposited, which makes the harbor stable, moderate in salinity, rich in bait, no industrial pollution in the offshore, and clear water quality. According to the monitoring, the seawater in the bay meets the standards of Class I and II seawater, which makes the production conditions of the crabs unique. The Sanmen is a subtropical monsoon climate zone. The climate in the production area is warm and humid, with four distinct seasons. There is no obvious severe cold and hot summer. The annual average temperature is 16.8 °C, the historical extreme low temperature is -6 °C, the summer extreme high temperature is 36.3 °C, and the frost-free period is 276 days. The annual average rainfall is 1380.7 mm, with obvious climatic monsoon climate and climatic characteristics of rain and heat in the same season. The salinity of the producing area is usually 18-32 ‰, the harbor is 5-18 ‰, and the annual average sunshine hours is 1608 hours. The average wind speed is 1.7 m / s, the southwest wind is dominant in summer and the northeast wind is dominant in winter. The optimal growth temperature of Sanmen blue crab is 18°C-32°C, and the normal growth temperature is 6-35°C. It inhabits the shallow sea with low salinity and the optimum salinity is 13.76-26.9‰. Therefore, the geographical, environmental and climatic conditions in the producing area are the best growth areas for the Sanmen blue crab. The three-door blue crab is an arthropod, a crustacean, a decapod, a species of the genus Crab, a suitable temperature of 7 ° C ~ 37 ° C, a salinity of 2.6 ~ 35 ‰, a pH of 7.0 ~ 8.9, burrow life, nocturnal night Mainly to meat, supplemented by feeding. Sanmen blue crab contains 18 kinds of amino acids. Each 100g edible part contains protein 14.0g, fat 2.5g, carbohydrate 0.8g, calcium 135mg, phosphorus 139mg, iron 13mg, vitamin A up to 5980 international units. Sixth, the blue crab produced in July (about 150 ~ 350g), has a unique fragrance when eating. Sanmen blue crab has extremely high medicinal value. Meat and internal organs can cure phlegm, dermatitis, clear sore, damp heat, postpartum blood closure, etc. Long-term consumption has the effect of reducing water swelling, nourishing yin and strengthening yang, and is an excellent beauty health food. . The color of the three-door blue crab is bright blue, the shell is thin and thick, the body is full and full, the meat is tender and the flavor is rich, and it is a low-fat and high-protein food. Due to the high temperature in the coastal areas of Guangdong, Guangxi and Vietnam, the growth of blue crabs is relatively fast, the growth period is relatively short, and the acidic nature of the mangrove areas is high, resulting in coarse, mild taste and thick shell color. Far less than three blue crabs. The test results show that Sanmen blue crab has low moisture content, high protein content and rich sweet amino acid content compared with other crabs in other places, indicating that the meat is full and firm, delicious and sweet, and tastes good. Famous brand products in domestic blue crabs. The three-door green crab seedlings are sourced from Sanmen Bay, Taizhou Bay and the inner bank of Hangzhou Bay. The seeds from Fujian and Guangdong need to be cultivated and selected for breeding. Our county government and fishery authorities organized scientific and technical personnel to carry out artificial breeding of blue crabs, and cultivated healthy three-door blue crab high-quality varieties, laying a solid foundation for quality. In the process of breeding, after careful breeding and domestication by the majority of farmers and scientific and technical personnel, the fine varieties are maximized and their growth period is extended. The whole seawater in the county can be cultured all year round. Formed the "green back, yellow belly, golden claws, tongs" characteristic appearance, forming excellent varieties of cold resistance, wide salt, wide temperature, greatly improved the survival rate of cultivation, thus laying the foundation of "Sanmenqing Crab, the world of the world.

Three-door blue crab quality technical requirements (a) variety. Serratus crab [scyllcc serratoc]. (2) Natural germplasm protection areas. East longitude 121°31′53′′, north latitude 28°53′32′′, east longitude 121°36′51′′, north latitude 28°52′44′′, east longitude 121°38′19′′, north latitude 28°57′07′′, east longitude 121 °39′36′′, north latitude 28°57′07′′ is a natural germplasm conservation area of ​​Sanmen blue crab. Provide artificial breeding crabs by adding value and protection to the natural crab resources in the area. (3) Parents. The artificial breeding crabs come from the protected area. The germplasm of the pro-crab requires the female crust with a shell width of 14cm or more and a body weight of 350g or more. The female crab has been mated, and has a strong constitution, strong vitality, complete appendages, no damage, and the amount of eggs is more than 1.5 million. (4) Seeds. The crab seedlings used for artificial breeding are required to stock the C4 stage of the juvenile crab, with a specification of 5,000/kg or less. The shell is hard, blue, and the specifications are neat, the appendage is complete, no injury, and the reflection is sensitive. Reference to artificially cultivated seed requirements for catching crab seedlings in natural sea areas. (5) Adult crab farming. 1. Pond requirements: The area of ​​the blue crab single pond is 0.2hm2 to 0.3hm2, and the area of ​​the mixed pond is 0.66hm2 to 1.33hm2. The water depth is between 100cm and 150cm. 2. Environmental requirements: The bait is rich in biomass, the temperature is 6 °C to 35 °C, the water temperature of the culture pond is 6 °C to 33 °C, and the salinity of the seawater is 5 to 32. 3. Breeding density: It can be stocked in spring and autumn. At the time of single raising, the seedling size is 5000/kg, and 22,500 to 37,500 seedlings per hectare, and the density of the seedlings in the polyculture pond is halved. 4. Feed and bait: The bait is mainly based on animal feed such as scorpion tendon, red meat blue scorpion, duck scorpion scorpion, freshwater snail, etc. It can be solved by artificial propagation or artificial harvesting and feeding in the pond; Special compound feed. The daily feeding amount accounts for 5% to 20% of the weight of the blue crab. It depends on the individual size and growth period of the blue crab. The smaller the individual, the higher the proportion. 5. Feeding cycle: no less than 4 months. 6. Mu yield: 100kg to 150kg for single ponds; 50kg to 100kg for polyculture ponds. 7. Product specifications up to 200g can be listed. Product quality grade: The first level, second grade and third appearance of the project are clean, the shell is blue and green, the lustrous vitality is lively and powerful, reflecting the agile silky clear, white or slightly brown, no smell, no odorous parasites (crab slaves) The odor can not be detected. It has the inherent fresh and astringent smell of live crab. The odorless tissue is tight and elastic. It is not easy to peel off. The crab yellow is not solidified. The shell is free of spotted spots. The spot disease is very small. The spot is less than the foot. Step foot lacks two to three steps foot weight and shell height ratio g / mm meat crab ≥ 3.1 ≥ 2.9 ≥ 2.7 cream crab ≥ 3.5 ≥ 3.2 (six) quality characteristics. 1. Sensory characteristics: green back, yellow belly, golden claws, tongs, shell thin, chelated, crab yellow yellow white, grease orange-yellow, crab meat white and delicate. 2. Physical and chemical characteristics: crude protein ≥ 18%, crude fat ≤ 4%, glutamic acid ≥ 3.36%, glycine ≥ 1.25%, alanine ≥ 1.08%.

Apply to：
An export enterprise within the scope of protection of the Sanmen Blue Crab GI product may apply to the Taizhou Entry-Exit Inspection and Quarantine Bureau for the use of the “Special Mark for Geographical Indication Products”; other producers within the scope of protection may apply to the quality technology of Sanmen County, Zhejiang Province. The application by the Supervisory Bureau to use the \"Special Mark for Geographical Indication Products\" shall be approved by the General Administration of Quality Supervision, Inspection and Quarantine. Artificial breeding has begun in 1988.