Blue crab, commonly known as blue crab, is a kind of blue crab belonging to the genus Portunus, crustacea, which is widely distributed in the Yangtze River estuary and the coastal waters in southern China. It is one of the marine fishery resources and mariculture varieties with important economic value. This variety has the characteristics of fast growth, delicious meat and high nutritional value, and is known as "sea cucumber". Domestic and international markets are in short supply and are well received by consumers. Scylla has been cultivated in China for 100 years. Driven by market value, fishermen's farming enthusiasm is very high and the scale of farming is also very large. According to China Fishery Statistical Yearbook 20 18, China's blue crab culture area is nearly 350,000 mu, and its annual output exceeds150,000 tons. Guangdong Province accounts for more than one third of the national aquaculture output.

Land-based high-density circulating water culture technology of blue crab can improve the yield of blue crab. Do you want to learn? Construction of Land-based Workshop The land-based workshop in this study was built in Raoping Mangrove Ecological Fisheries Co., Ltd., which is close to the sea, with convenient land and water transportation and sufficient water and electricity supply. The foundation of the workshop adopts concrete structure (depth 1.5m), the middle and upper parts adopt insulation board, and the ceiling adopts steel structure bracket with insulation board and iron sheet. Workshop length18m, width 8m and height 3m. Equipped with 8 windows and 8 ceiling fans, it is convenient to adjust the indoor light intensity and temperature.

Land-based high-density circulating water culture technology of blue crab can improve the yield of blue crab. Do you want to learn? Construction and perfection of breeding system The design of a single incubator is 35cm long, 30cm wide and 15cm high, with built-in overflow pipe (7cm high). Each incubator can hold 5 liters of seawater. Incubators are arranged horizontally and vertically to form a three-dimensional culture system, with two rows on each floor and 20 individual incubators in each row. * * * 8th floor, ***320 Aquarium. A channel with a width of 1.5m is set between two adjacent farming systems for farming management. Six blue crab breeding systems and 80 breeding units have been built, which can breed 2000 crabs at a time.

In order to improve the culture efficiency and facilitate management, the culture system has been improved in the following three aspects: (1) a pressurized sewage device is added, which can directly inject high-pressure water into the sewage pipeline, effectively remove the residual bait in the sewage pipeline and prevent the water quality from deteriorating; (2) adopting a high-pressure water inlet and increasing oxygen in the aquaculture water; ③ observation wells are added to facilitate lighting and real-time observation.