It is very difficult to measure how fast a fish can swim, but researcher can only rely on rough estimates. However, the sailfish is absolutely fast. It's predatory behavior and its body structure shows its need for speed. example the bill is the cause of low resistance flow. It has been recorded spooling out 300 ft of a fisherman's line in three seconds. That would be faster than a sprinting cheetah, this speed would include its leaps out of water. Some researcher estimate 60 mph or faster. It also has a strong backbone and a strong crescent-shaped tail to complete the sprinting swimmers shape.
