Alex Mustard / Close up of the scale details of a Yellow-mask angelfish (Pomacanthus xanthometopon). Baa Atoll, Maldives. Indian Ocean

Doug Perrine / Hawksbill turtle {Eretmochelys imbricata} attended by Yellowmask angelfish {Pomacanthus xanthometopon} which feed on items dilodged by the turtle, Sipadan Island, Sabah, Borneo, Malaysia

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, Yellowbar angelfish (Pomacanthus maculosus), Square-spot anthias (Pseudanthias pleurotaenia), male and female, Seagrass filefish (Acreich...

Georgette Douwma / Tropical angelfish composite image on black background, Blue-ringed angelfish (Pomacanthus annularis), Semicircle angelfish (Pomacanthus semicirculatus), Blacktail angelfish (Centropyge eibli), Regal...

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...