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

Linda Pitkin / Bluespine unicornfish (Naso unicornis) Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Linda Pitkin / Bluespine unicornfish (Naso unicornis) Shark Reef to Jolande, Ras Mohammed National Park, Egypt, Red Sea.

Alex Mustard / School of Bluespine unicornfish (Naso unicornis) gathered during the summer breeding season. Yolanda Reef, Ras Mohammed Marine Park, Sinai, 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.