Blackstreak surgeonfish, Acanthurus nigricauda, or epaulette surgeonfish, eye-line surgeonfish, shoulderbar surgeonfish, white-tail surgeonfish, is a tropical fish in the family Acanthuridae. It is native to the Indo-Pacific region. It occurs over sandy and rocky bottoms, in bays, lagoons and on reef slopes, at depths down to about 30 m.

Il Pesce chirurgo labbra chiare Acanthurus leucocheilus è un pesce osseo marino appartenente alla famiglia Acanthuridae. La specie è ampiamente distribuita nell'Indo-Pacifico tropicale tra le coste africane orientali a Tuvalu e alle Sporadi Equatoriali. Vive nella parte esterna delle barriere coralline specie vicino alle cadute dove il fondo scende bruscamente verso le alte profondità.

Acanthurus bariene is a tropical fish also commonly known as the bariene surgeonfish, blackspot surgeonfish, or eyespot surgeonfish. It was first named by René Primavère Lesson in 1831. This species is widespread in the tropical Indo-Pacific from Mozambique and the Maldives in the west to the Solomon Islands in the east and reaching north to the Ryūkyū and south to the Australian Great Barrier Reef. The habitat of this fish is the coral reefs where it lives on the outer side in depth. The juveniles live in shallow waters and in areas protected from the waves, finding refuge among the soft corals. It can be found between 6 and 50 meters of depth, rarely above 15 meters and usually below 30.