Achilles Tang (Acanthurus achilles)

Also known as Doctorfishes, Lancetfishes, Thorntails, Thorntail Fishes, Achilles Surgeonfish, Red-spot Surgeonfish, Orange-spot Surgeonfish, Red-tailed Surgeon.

Description

Also known as Doctorfishes, Lancetfishes, Thorntails, Thorntail Fish, Achilles Surgeonfish, Orange-spot Surgeonfish, Red-spot Surgeonfish, Red-tailed Surgeon.

Found singly or in groups over clear water sand bottoms close to surge zones of reefs.
Very aggresive and territorial.
They feed on algae.
Length - 20cm
Depth - 0-4m
Widespread Central Pacific

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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