GRAYLING, the name for fishes of the genus Thymallus, of the family Salmonidae, distinguished by rather large scales, a small mouth with feeble teeth, and a long dorsal fin, with 20 to 24 rays. Six species are known from the rivers of Europe, Siberia and northern North America. They are handsome fishes, and afford good sport to anglers. They are excellent for the table. (See SALMON AND SALMONIDAE.)