Pecten scallops originated in China, from the coast of Shandong Rizhao all the way to the coast of Liaoning, are distributed in the Qingdao market generally sells seven yuan a catty. Gulf scallops originated in Canada, the United States and Mexico, introduced to China in 1982, about three yuan a catty. Ezo scallop origin is North Korea and Japan, introduced into China in the 1980s, generally farmed in the Liaoning coast, generally about 20 yuan a catty, generally sold to Hong Kong, Guangzhou area. Shandong is mainly farmed production of bay scallops and pecten scallops, bay scallops are mainly farmed in Shandong Laizhou coast and the coast of Hebei area, pecten scallops are mainly farmed in Penglai to the northeast of the coast and Rizhao to the southeast of the coast.