Paracanthurus hepatus, commonly known as the regal tang, is an average-sized colorful reef fish belonging to the family Acanthuridae. A popular fish in marine aquaria, it is the only member of the genus Paracanthurus. A number of common names have been attributed to the species, including but not limited to palette surgeonfish, blue tang (leading to easy confusion with the Atlantic Acanthurus coeruleus), royal blue tang, hippo tang, flagtail surgeonfish and blue surgeonfish.
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