Description

Also known as Chocolate Surgeon, Chocolate Surgeonfish, Doctorfish, Lancetfish, Night Surgeonfish, Thompson's Tang, Thorntail, Thorntail Fish, Whitetail Surgeonfish, White-tailed Surgeonfish.

Found singly or in small schools, over coral and sandy areas, along steep drop-offs and steep outer reef slopes. Can change colour when disturbed.
They feed on crustaceans, fish eggs, and zooplankton.
Length - 27cm
Depth - 4-75m
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/4734