GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Bluering angelfish (Pomacanthus annularis) and a moorish idol (Cornutus zanclus). The bluering angelfish inhabits caves and hidden areas in coral reefs, feeding on algae, sponges, shrimp and shellfish, and can reach a length of 30 centimetres. The moorish idol feeds mainly on sponges and algae, and can reach a length of 20 centimetres. Photographed in the Andaman Sea, off Thailand.
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