The Redtooth Triggerfish (Odonus niger) is often seen in large schools in troical and sub-tropical seas of the Indo-Pacific region. It is also known as Blue Triggerfish, Niger Triggerfish, Redfang Triggerfish & Red-toothed Filefish. It's the only member of its genus, Odonus. In general they eat plankton, but are also known to eat sponges. They are rarely seen deeper than 30 metres.