Doug Perrine / Green sea turtle (Chelonia mydas) being cleaned of algae by Yellow tangs (Zebrasoma flavescens), Chevron tangs (Ctenochaetus hawaiiensis), Black durgon triggerfish (Melichthys niger) and Parrotfish (S...

Doug Perrine / Green sea turtle (Chelonia mydas) being cleaned of algae by Yellow tangs (Zebrasoma flavescens) and Goldring surgeonfish (Ctenochaetus strigosus) as it swims midwater, Puako, South Kohala, Hawaii, USA...

Doug Perrine / Green sea turtle (Chelonia mydas) opens mouth while being cleaned of algae by Yellow tangs (Zebrasoma flavescens), Goldring surgeonfish (Ctenochaetus strigosus) and Blueline surgeonfish (Acanthurus ni...

Doug Perrine / Green sea turtle (Chelonia mydas) being cleaned of algae by Yellow tangs (Zebrasoma flavescens) and Goldring surgeonfish (Ctenochaetus strigosus) as it swims, Puako, South Kohala, Hawaii, USA, Pacific...

Doug Perrine / Green sea turtle (Chelonia mydas) being cleaned of algae by Yellow tangs (Zebrasoma flavescens) and Goldring surgeonfish (Ctenochaetus strigosus), Puako, South Kohala, Hawaii, USA, Pacific Ocean. Enda...

David Fleetham / Sailfin tang (Zebrasoma veliferum) on coral reef at night, Indonesia, Indo-Pacific.

Doug Perrine / Male Pearl wrasse (Anampses cuvier) swimming over rocks with Yellow tang (Zebrasoma flavescens) alongside, Kahaluu Beach Park, South Kona, Hawaii, Pacific Ocean.

Doug Perrine / Female Blackstripe Coris (Coris flavovittata) with Goldring surgeonfish (Ctenochaetus strigosus) and Yellow tangs (Zebrasoma flavescens) on a reef, South Kona, Hawaii, Pacific Ocean.

Alex Mustard / Close up detail of the patterns on a Sailfin tang (Zebrasoma desjardinii), Sharm El Sheikh, Egypt. Red Sea.

Georgette Douwma / RF - Composite image of blue tropical reef fish on a black background, Blue triggerfish (Pseudobalistes fuscus), Elonggate surgeonfish (Acanthurus mata), Yellowtail tang (Zebrasoma xanthurum), Neon da...

Georgette Douwma / RF - Tropical reef fish, composite image on black background, Thornback cowfish (Lactoria penthacantha), Mandarinfish (Synchiropus splendidus), Square-spot antias (Pseudanthias pleurotaenia), Lionfis...

Georgette Douwma / Surgeonfish, composite image on black background, Yellowtail tang (Zebrasoma xanthurum), Powder-blue surgeonfish (Acanthurus leucosternon), Elongate surgeonfish (Acanthurus mata), Striped surgeonfish...