Also known as Bariene Surgeonfish, Bariene Tang, Blackspot Surgeonfish, Blackspot Tang, Doctorfish, Eyespot Surgeon, Eyespot Surgeonfish, Eyespot Tang, Lancetfish, Ocean Surgeon, Pencilled Surgeonfish, Roundspot Tang, Thorntail, Thorntail Fish.
Found singly or in pairs over deep reef slopes and outer walls of clear seaward reefs.
They feed on algae.
Juveniles found amongst corals on shallow protected reefs.
Length - 50cm
Depth - 6-50m
Widespread Indo-West Pacific
Surgeonfish have a blade like spine in the tail that points outwards when bent, unicorns have two hook-like plates along the tail, these are used for defence and are as sharp as a surgeons scalpel, hence the name "Surgeonfish".
Some species are venomous. Ref: http://www.fishbase.org/summary/4307