One of the mysteries of the English language finally explained.
Any of various fishes with brilliant colours or markings, including the cuckoo wrasse, Labrus mixtus, and the peacock bass, Cichla ocellaris; (also) any of various fishes with conspicuous fan-shaped fins or tails, including the guppy, Poecilia reticulata, and tropical fishes of the genus Pterois (family Scorpaenidae).
Mid 17th century; earliest use found in Robert Lovell (?1630–1690), naturalist. From peacock + fish.
peacock fish/ˈpiːkɒk ˌfɪʃ/
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