SALMON FAMILY--Salmonidae

GRAYLING SUBFAMILY--Thymallinae

     The grayling is separable from trouts and salmon by its large dorsal fin, with more than 15 rays (salmon and trout have fewer than 15). The Michigan grayling was formerly abundant but became extinct in the late 1930s. Grayling lived in cold streams. Spawning was in the early spring; eggs were laid in the shallows over sand and fine gravel. The extermination of this fish was caused by habitat destruction through deforestation, introduction of trout, and by fishermen.