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Mainly for protection from predators. There are several reasons why schooling might help fish, most of which are related to predator avoidance, as suggested above. One is possibly the reason given above. Second, schooling gives the school of fish the appearance that it is a larger organism, which might deter some predators. Third, schooling makes predation more difficult. Predators often key in on a single individual for s successful kill. If there are many moving together, it makes it more difficult for the predator to focus on one prey animal, generally improving survival of the entire group. There may also be some energetic reasons why fish school as it may reduce the drag in the water for any individual fish.

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16y ago

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