The annual output is 270,000 tons and the sales volume is 400 million. According to the inquiry, the sales volume of seafood in Shenzhen area. It is reported that at present, more than 95% of manhole oysters are obtained through relocation bases, and manhole oysters are cultivated in different places with an annual output of 270,000 tons, including Taishan, Yangjiang, Huidong, Shanwei and other surrounding areas of Shenzhen. There are thousands of employees downstream of Shajing oysters.