Norbert Wu / Green Sea Turtle (Chelonia mydas) being cleaned by Yellow-eyed Surgeonfish (Ctenochaetus strigosus), Hawaii

Pascal Kobeh / Ocan Pacifique - Nouvelle caldonie - Gros plan de la tte d'un nason licorne (Naso brevirostris) de nuit Pacific Ocean - New Caledonia - A close-up of the head of a spotted or longnose unicornfish (Na...

Magnus Lundgren / Wild Wonders of China / Spotted unicornfish (Naso brevirostris) Green Island, a small volcanic island in the Pacific Ocean , Taiwan

Gary Bell/ Oceanwide / Convict Surgeonfish (Acanthurus triostegus) school, Christmas Island, Australia

Gary Bell/ Oceanwide / Powderblue Surgeonfish (Acanthurus leucosternon), Christmas Island, Australia

Gary Bell/ Oceanwide / Unicornfish (Naso vlamingii), Papua New Guinea

Alex Mustard / Post larval Red Sea sailfin tang (Zebrasoma desjardinii), Gubal Island, Egypt. Strait Of Gubal, Gulf of Suez, Red Sea.

Georgette Douwma / Elongate surgeonfish (Acanthurus mata). West Papua, Indonesia. Indo-West Pacific.

Georgette Douwma / Mimic surgeonfish (Acanthurus pyroferus). North Sulawesi, Indonesia.

Georgette Douwma / Brown tang (Zebrasoma scopas). North Sulawesi, Indonesia.

David Fleetham / Eyestripe surgeonfish (Acanthurus dussumieri) and Bigscale soldierfish (Myripristis berndti) school. Hawaii.

David Fleetham / Orangespine unicornfish (Naso lituratus), female amongst Bigscale soldierfish (Myripristis berndti) school, Hawaii.