DR GEORGE GORNACZ / SCIENCE PHOTO LIBRARY DR GEORGE GORNACZ / SCIENCE PHOTO LIBRARY
Perch. Shoal of moses perch, Lutyanus russelli, swimming past part of a coral reef. Fish swim in shoals to reduce predation. This is because a group of fish has a better chance of seeing a predator than a lone individual. Also, a swirling mass of fish can confuse a predator. Photographed on the Great Barrier Reef, Australia.
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