Lined Surgeonfish

Found singly or in harems, over shallow reef flats, gutters, and slopes usually exposed to surge currents.

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.

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