A large school of convict tang (Acanthurus triostegus) on the only living reef in the Sea of Cortez, Cabo Pulmo, Baja California Sur, Mexico, North America

Yelloweye Bristletooth, Ctenochaetus truncatus, Christmas Island, Australia

Green sea turtle (Chelonia mydas) gets cleaned by yellow tangs (Zebrasoma flavescens) and lined bristletooth (Ctenochaetus striatus), Kailua-Kona, Hawaii, United States of America, Pacific

Green sea turtle (Chelonia mydas) gets cleaned by yellow tangs (Zebrasoma flavescens) and lined bristletooth (Ctenochaetus striatus), Kailua-Kona, Hawaii, United States of America, Pacific

Green sea turtle (Chelonia mydas) getting cleaned by yellow tangs (Zebrasoma flavescens) and lined bristletooth (Ctenochaetus striatus), Kailua-Kona, Hawaii, Pacific

Green sea turtle (Chelonia mydas) gets cleaned by yellow tangs (Zebrasoma flavescens) and lined bristletooth (Ctenochaetus striatus), Kailua-Kona, Hawaii, United States of America, Pacific

Underwater photographer Masa Ushioda and Green sea turtle (Chelonia mydas) getting cleaned by yellow tangs (Zebrasoma flavescens) and lined bristletooth (Ctenochaetus striatus), Kailua-Kona, Hawaii, United States of America, Pacific

Yellow tang (Zebrasoma flavescens), Rongelap, Marshall Islands, Micronesia, Pacific

A diver observes green sea turtle (Chelonia mydas) getting cleaned by yellow tangs (Zebrasoma flavescens) and lined bristletooth (Ctenochaetus striatus), Kailua-Kona, Hawaii, United States of America, Pacific

Green sea turtle (Chelonia mydas) getting cleaned by yellow tangs (Zebrasoma flavescens) and lined bristletooth (Ctenochaetus striatus), Kailua-Kona, Hawaii, Pacific

Diver observes green sea turtle (Chelonia mydas) gets cleaned by yellow tangs (Zebrasoma flavescens) and lined bristletooth (Ctenochaetus striatus), Kailua-Kona, Hawaii, United States of America, Pacific

Green sea turtle (Chelonia mydas) getting cleaned by yellow tangs (Zebrasoma flavescens) and lined bristletooth (Ctenochaetus striatus), Kailua-Kona, Hawaii, Pacific

Green sea turtle (Chelonia mydas) gets cleaned by yellow tangs (Zebrasoma flavescens) and lined bristletooth (Ctenochaetus striatus), Kailua-Kona, Hawaii, United States of America, Pacific

Green sea turtle (Chelonia mydas) gets cleaned by yellow tangs (Zebrasoma flavescens) and lined bristletooth (Ctenochaetus striatus), Kailua-Kona, Hawaii, United States of America, Pacific

Green sea turtle (Chelonia mydas) getting cleaned by yellow tangs (Zebrasoma flavescens) and lined bristletooth (Ctenochaetus striatus), Kailua-Kona, Hawaii, Pacific

Juvenile Blue Tang (Acanthurus coeruleus), juveniles are yellow & this small fish is swimming away from camera over indistinct reef, Cayman Islands, Caribbean

Juvenile Blue Tang (Paracanthurus sp). Caribbean.

Green sea turtle, Chelonia mydas, gets cleaned by yellow tangs, Zebrasoma flavescens and lined bristletooth, Ctenochaetus striatus, Kailua-Kona, Hawaii, (N. Pacific)

Green sea turtle, Chelonia mydas, gets cleaned by yellow tangs, Zebrasoma flavescens and lined bristletooth, Ctenochaetus striatus, Kailua-Kona, Hawaii, (N. Pacific)

Hawaii, Goldring surgeonfish and yellow tangs are cleaning algae from the shell of this green sea turtle (Chelonia mydas) an endangered species.

Hawaii, Maui, Makena, Ahihi Kinau Natural Area Reserve, School of Manini or Convict Tang fish (Acanthurus triostegus) and snorkeler.

Hawaii, Maui, Makena, Ahihi Kinau Natural Area Reserve, School of Manini or Convict Tang fish (Acanthurus triostegus).