ANDREW J. MARTINEZ / SCIENCE PHOTO LIBRARY ANDREW J. MARTINEZ / SCIENCE PHOTO LIBRARY
Blue-green chromis fish. School of blue-green chromis fish (Chromis viridis) swimming over a coral reef. These are common fish in coral reefs in the warm seas of south-eastern Asia, down to a depth of about 10 metres. They feed mainly on plankton, and flee to the safety of the coral branches at the slightest hint of danger. They may reach a length of around 10 centimetres. Photographed off Bali, Indonesia.
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