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a family of fish of the order Perciformes. The body is elongated, reaching up to 2 m (in the common dolphin, or dorado [ Coryphaena hippuris]), and compressed at the sides; the scales are small. The dorsal fin is long, and the caudal fin is forked. There is one genus comprising two species. The fish are distributed in warm and temperate seas. The Coryphaenidae are pelagicfish.