MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY
Schooling Bigeye trevally. The trevally or jackfish (Caranx sexfasciatus) congregates in large schools during the day normally along the edges of a reef wall in an area with the strongest current. The resulting mass of fish makes it difficult for predators such as sharks and tuna to focus on a single target. At night the school fragments to feed on smaller fish and crustaceans. It can reach lengths of 120 centimetres and weigh up to 18 kilograms. It inhabits tropical and subtropical coastal waters and is regarded as an excellent human food source. Photographed at Pulau Kapalai, Sabah, Malaysia.
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