Jeff Rotman / Detail of dorsal fin of Bluespine Unicornfish (Naso Unicornis) Red Sea, Egypt

Georgette Douwma / School of Bluespine / Short nosed unicornfish {Naso unicornis} Egypt, Red Sea

Jeff Rotman / Close up of the eye of a Bluespine Unicornfish (Naso Unicornis) Red Sea, Egypt

GEORGETTE DOUWMA / Bluespine unicornfish (Naso unicornis)

GEORGETTE DOUWMA / Bluespine unicornfish (Nasi unicornis) school with fish showing colour changes. Egypt, Red Sea.

Georgette Douwma / Bluespine surgeonfish (Naso unicornis) school. These fish can rapidly change colour, Rinca, Indonesia

GEORGETTE DOUWMA / Bluespine unicornfish (Naso unicornis) Red Sea, Egypt.

GEORGETTE DOUWMA / Bluespine unicornfish (Naso unicornis) Red Sea, Egypt.

Jeff Rotman / Bluespine Unicornfish (Naso unicornis) portrait. Great Barrier Reef, Australia.

GEORGETTE DOUWMA / Bluespine unicornfish {Naso unicornfish} Red Sea

GEORGETTE DOUWMA / Bluespine unicornfish {Naso unicornis} Red Sea

Jeff Rotman / Close-up of Bluespine unicornfish dorsal fin (Naso unicornis) Australia, Great Barrier Reef