Description

Also known as Black Surgeonfish, Black-barred Surgeonfish, Blackstreak Surgeonfish, Brown-eared Surgeonfish, Doctorfish, Epaulette Surgeon, Epaulette Tang, Eye-line Surgeonfish, Eye-stripe Surgeonfish, Lancetfish, Shoulderbar Surgeonfish, Thorntail, Thorntail Fish, Whitetail Surgeonfish.

Found singly or in small schools, around isolated coral heads, over sandy areas of bays and lagoons.
They feed on algae.
Length - 40cm
Depth - 1-30m
Widespread Indo-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: https://www.fishbase.se/summary/4747