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

David Hall / Yellow tangs (Zebrasoma flavescens) and Brown surgeonfish (Acanthurus nigrofuscus) cleaning a Green sea turtle (Chelonia mydas) at "cleaning station", feeding on alage on turtle's skin and shell,...

David Hall / RF - Green sea turtle (Chelonia mydas) at a turtle "cleaning station" being cleaned by Brown surgeonfish (Acanthurus nigrofuscus) and Yellow tangs (Zebrasoma flavescens), Big Island, Hawaii, Pacific O...

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

Georgette Douwma / Surgeonfish composite image on black background, Powder-blue surgeonfish (Acanthurus leucosternon), Striped surgeonfish (Acanthurus lineatus), Mimic surgeonfish (Acanthurus pyroferus), Sohal surgeonfi...

Georgette Douwma / Surgeonfish composite image on black background, Bluespine surgeonfish (Naso unicornis), Striped surgeonfish (Acanthurus lineatus), Sailffin tang (Zebrasoma veliferum) juvenile, Mimic surgeonfish (Aca...

Georgette Douwma / Blue tropical reef fish composite image on black background, Blue triggerfish (Pseudobalistes fuscus), Bicolour angelfish (Centropyge bicolor), Elongate surgeonfish (Acanthurus mata), Yellowtail tang...

Georgette Douwma / Yellow tropical reef fish composite image on black background, Falcula butterflyfish (Chaetodon falcula), Yellow boxfish (Ostracion cubicus), Golden butterflyfish (Chaetodon semilarvatus), Red Sea clo...

Georgette Douwma / Yellow tropical reef fish composite image on black background, Sailfin tang (Zebrasoma veliferum) juvenile, Pajama cardinalfish (Sphaeramia nematoptera), Three-spot angelfish (Apolemichthys trimaculat...

Georgette Douwma / Brown scopas tang (Zebrasoma scopas) with unusual colouration, in coral reef. Derawan Islands, East Kalimantan, Indonesia.