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The Sailfish
Atlantic sailfish are the fastest fish in the ocean. They can reach more than 60 miles (90 kilometres) an hour.
Sailfish feed mainly on squid, octopus and bony fish like mackerel. Whilst they are feeding, sailfish change colour - their gill cover, pectoral fins and flanks turn bright blue. This alerts other sailfish nearby that they are about to strike, as a collision could prove fatal.
