Also known as Black-barred Surgeonfish, Black-barred Tang, Chocolate Surgeonfish, Chocolate Tang, Doctorfish, Lancetfish, Lemonpeel Surgeonfish, Lemonpeel Tang, Mimic Tang, Orange-gilled Surgeonfish, Orange-gilled Tang, Pacific Mimic Surgeon, Pacific Mimic Surgeonfish, Pacific Mimic Tang, Thorntail, Thorntail Fish, Yellow Mimic Surgeonfish, Yellow Mimic Tang, Yellowspot Surgeon.
Found singly, over mixed coral, rock and sand, around ledges and bases of reefs, in silty lagoons and seaward reefs rich in algae growth.
They feed on algae.
Juveniles have yellow bodies and can mimic yellow pygmy angelfish.
Length - 25cm
Depth - 4-60m
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. (edit) Ref: https://www.fishbase.se/summary/4742