Convict Surgeonfish

Found in large schools, over hard substrates, and around jetties, in shallow, protected, lagoons and seaward reefs. Sometimes found in their thousands, enabling them to chase other fish away, giving them the chance to eat the rich algae guarded by other species. Identified by their pale cream bodies and black strips like a convicts uniform.

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: 2 comments on the juvenile.