Oyster and its related animals are all marine shells. Suitable for oyster culture in subtropical and tropical coastal areas, widely distributed in China. Oysters can be produced from the Yalu River in the north to the coast of Hainan Island in the south. Oysters are soft-shelled parasitic animals, especially those produced in the freshwater border of Yu Xian.

Oyster is a mollusk. It has two shells, one is small and flat, the other is big and bulging, and the surface of the shell is uneven. Meat can be eaten and oyster sauce can be made. Meat, shell and oil can be used as medicine, also called oysters or oysters.