The American soles, of which there are several Atlantic and one Pacific species, have small, close-set eyes and small, twisted mouths with few or no teeth. They prefer warm, shallow water with a sandy or muddy bottom and are generally too small and bony for food. The hogchoker, or broad sole, and the tonguefish, family Cynoglossidae, are most common. The European species Solea solea, a 2-ft (61-cm) flatfish found from the Mediterranean to the North Sea, is a valuable food fish, the source of filet of sole (in the United States filet of sole is usually flounder).
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