Bluespine unicornfish

Naso unicornis
Nason brun
Ume

Interesting facts

This unicornfish varies from green to brown. It has scalpels and blue lips. its horns never go past its muzzle. Adults have a truncated tail  with two filaments at the ends. It lives between 3 and 600 feet deep along the exposed reefs. It primarily eats leafy algae.

sources

Photo :Brian Gratwicke