Monodactylidae

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Monodactylidae (diamond fish, moon-fish; subclass Actinopterygii, order Perciformes) A small family of marine coastal fish that have a strongly compressed and deep body: the large dorsal and anal fins give the fish a diamond-shaped profile. Except for two dark bands across the head, these fish are a plain, silvery colour. About five species occur in the Indo-Pacific region.