Acanthurus olivaceus (Bloch & Schneider, 1801)
Other Common Names:
Orange Spot Surgeonfish, Orange Bar Surgeonfish, Orange Band Surgeonfish
The Orange Shoulder Tang is a very overlooked fish. Its colors are not very bright, but with the brownish-olive two tone coloration accented by the bright orange bar on its shoulder, it is actually a very beautiful fish to have in an aquarium. The body of this fish during its juvenile stage is bright yellow, lacking the orange spot which develops as it matures.
The distribution of this species extends from Hawai'i southward to central Polynesia and westward through Micronesia, Melanesia, the Philippines, and the East Indies.
Because of its size and constant roaming nature, the minimum aquarium size suggested for this fish is 135 gallons. As long as the aquarium is large enough a juvenile and an adult may be kept together. It is generally compatible with other non-aggressive tank mates, but if plans are to keep this species with other Surgeonfishes, it is recommended to add this fish first, or if of the same species, place them in the aquarium at the same time.
Being a herbivore this fish feeds on filamentous algae, diatoms, as well as detritus off sand bottom substrates. It is best kept in an aquarium with an open sand bottom and ample algae growth for grazing. It usually does not bother corals.