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Chaetodon semeion
Place of origin: 
Indian Ocean
West Pacific and eastern Indian Ocean. Adults usually on deep coastal reef slopes, but sometimes feed in the shallows on reef crests or coastal flats amongst corals and algae. They swim in pairs or small groups, usually on the move and appear to be a roaming species. Small juveniles in coral-rich lagoons, usually swimming above the corals with other similar-sized butterflyfishes of mixed species. Identified by its bright yellow colour and adults by the blue on the front of the head. Juveniles have a black band over the head that hides the eye and a black bar on the caudal fin base with a white edge on the fin. Length to 24cm.

The members of the family Chaetodontidae, popularly know as butterflyfishes, coralfishes and bannerfishes. Most species of butterflyfish live in the warm tropical seas of the Indo-Pacific (about 90%) with the remainder in the Atlantic. Only a few species are found in subtropical waters, bordering onto subtemperate zones. The butterflyfish have a highly compressed body in which the back is raised , forming an elongate-oval to near circular shape in some; a small protactible mouth with brush-like teeth in the jaws; a continuous dorsal fin with strong and sharp spines in the anterior section, followed by a large-surface soft part; an anal fin mirroring the soft part of the dorsal fin , headed by 3-5 strong spines, of which the 2nd is often greatly enlarged.

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