Masked Butterflyfish, Chaetodon semilarvatus Taken on Daedalus Reef in the Egyptian Red Sea.
Around 23 cm long, the Masked butterfly fish is large for its family. You generally see them in pairs or large groups on coral reefs, from 3 to 20 m. Very common throughout the Red Sea.
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Photo copyright Tim Nicholson.
The Underwater Photographer: Digital and Traditional Techniques, by Martin Edge, Paperback, 536 pages (2009)