
Titan Triggerfish
This Titan Triggerfish - Balistoides viridescens can be very aggressive when they are brooding their eggs.
They have been known to 'attack' divers who get too close to them. They have very sharp teeth and can cause serious damage.
I have personally been 'bitten' by one of them and their sharp teeth managed to cut through my finger nails!

The titan triggerfish, giant triggerfish or moustache triggerfish is a large species of triggerfish found in lagoons and at reefs to depths of 50 m in most of the Indo-Pacific, though it is absent from Hawaii. With a length of up to 75 centimetres, it is the largest species of triggerfish in its range.
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