The eulachon, also hooligan or candlefish, is a small anadromous ocean fish, Thaleichthys pacificus, a smelt found along the Pacific coast of North America from northern California to Alaska. It feeds primarily on plankton as well as fish eggs, insect larvae, and small crustaceans. It forms an important part of the diet of many ocean and shore predators, and serves as a prominent food source for people living near its spawning streams.