Sweepers on the Wreck of the Ulysses, Egypt, Red Sea.
Photo copyright Tim Nicholson, whose underwater photographs and photo books are available from http://www.photoboxgallery.com/timnicholson.
Taken on the Ulysses, Red Sea, Egypt.

The glassfish or sweepers in the photo like shady places during the day: wrecks, overhangs and caves. At night they venture out to feed on zooplankton.

Sweepers have large eyes and a single fin on their backs.. They are 10 cm long with yellow heads, peach-coloured bodies and a distinct lateral line running from head to forked-tail.

 
Further Reading
The Underwater Photographer: Digital and Traditional Techniques, by Martin Edge, Paperback, 424 pages (2006)
Shipwrecks from the Egyptian Red Sea by Ned Middleton; Immel Publishing, 196 pages.

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