Giant danio (Devario aequipinnatus) save energy by swimming together blickwinkel/Alamy
Swimming in schools has massive energy-saving benefits for fish. A study in “water tunnels” has found that fish use half as much energy swimming at high speeds if they are in a school rather than alone, and they also recover in nearly half the time.
This helps explain why so many fish species swim in schools, write Yangfan Zhang and George Lauder at Harvard University.
It has long been thought that swimming in schools reduces energy use in addition…
