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Blue, elongated oval, unicorn-fish, compressed and upper and lower profiles symmetrical. This one about 8" long. Squared off tail (caudal fin). Anal, ventral and trailing edge of the caudal fins a yellow olive and a dark tick (check) mark across the cheeks. It also has two pairs of small 'scalpel' scales at the base of its tail.
This one found in shallow water (4-8m) on coral reef just off Komodo Island in Indonesia and is probably a juvenile. As a species they do tend to occur in slightly deeper water as adults.
Interestingly this is a unicorn fish species that does not grow a horn from either gender. Also it is sometimes know as the Black-tongue Unicornfish as they develop a black tongue once they reach the 25cm length mark. Ref: Discover Life - Fish Base.