Fish ID: Humpback Unicornfish

Surgeonfish humpback unicornfish naso unicornis gil
Family Surgeonfish (ACANTHURIDAE)
species Naso Unicornis
size To 70cm
locality Lagoons and outer reefs
behaviour Solitary or in small groups
range Indo Pacific inc GBR

Slate grey body with distinctive humped back profile; filaments on tail. Male have small horn, females do not.