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Scatophagidae (scat, butterfish; subclass Actinopterygii, order Perciformes) A small family of coastal fish, members of which frequently penetrate into fresh water. They have a deep body, two separate dorsal fins, and, typically, four spines in the anal fin. Scatophagus argus (spotted butterfish or spotted scat), 32 cm, is a fairly common species in the Indo-Pacific region. There are three species.