But not quite. One particular shark has a pronounced ability to switch from salty ocean water to fresh water as necessary: the bull shark. Bull sharks can grow up to 11 feet long and weigh up to ...

The number of bull sharks -- one of the most aggressive species of shark in the world -- increased significantly in a 20-year period, and researchers say warmer seawater is to blame. Increasing ...

From left: Adam Lyons, Tommy Bowyer, David Stiller, and Michael Maguire with the pending state-record bull shark. Photo courtesy of Tommy Bowyer Four seasoned shark fishermen started offshore aboard ...