Sixplate Sawtail

Found in schools, over rocky shores of bays, estuaries and coastal reefs.
Juveniles found in coastal bays and estuaries.
Western Pacific- Southeastern Australia

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.