Also known as Doctorfishes, Lancetfishes, Thorntails, Thorntail Fish, Whitemargin Unicornfish, Whitemargin Unicorn Tang, Bluefin Unicornfish, Bluefin Unicorn Tang and Long-horn Unicornfish.
Found in small groups on steep outer reef slopes.
Can quickly change colour with mood.
They feed on plankton and algae.
Length - 100cm
Depth - 20-60m
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)