Pacific Sailfin Tang

Found singly or in small schools, over lower surge zones, of lagoons and seaward reefs. They have greatly enlarged dorsal and anal fins.

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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Other stages have their own discussion: 1 comment on the juvenile.