Shengsi mussel. Shengsi mussel is a special product of Shengsi County, Zhoushan City, Zhejiang Province, and a landmark product of chinese national geography. It is one of the top ten seafood products in China and a famous seafood specialty in Zhejiang Province. Shengsi mussel is called "mussel" in Zhoushan dialect, also called Haihong (Mrs. Donghai), red clam and shellfish. Shengsi County Shengsi County has superior sea environment, fertile water quality, rich bait and moderate temperature, which is conducive to the habitat of marine life and provides an excellent growth environment for Shengsi mussels. It has been listed as a kind of shellfish producing area by the Ministry of Agriculture. Shengsi people have a long history of collecting wild mussels for human consumption and trading. The mussels produced are large, tender, fleshy, high in meat yield, rich in nutrition and pollution-free, and are the best in seafood.