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Why Fish Swim in Schools
Marras, Stefano et al. Fish Swimming In Schools Save Energy Regardless Of Their Spatial Position. Behavioral Ecology And Sociobiology, vol 69, no. 2, pp. 219- 226, 2014, Springer Science And Business Media LLC. doi:10.1007/s00265-014-1834-4
First and foremost, schools protect fish from their enemies.1
It's the same rule our mothers taught us as youngsters, always stay in a group because there is safety in numbers. Predators find it far easier to chase down and gobble up a fish swimming all alone rather than trying to cut out a single fish from a huge group. The same holds in reverse. Fish can better defend their territory in a group. Bullies will think twice about facing an angry school of dozens or hundreds of fish.