The bull shark is commonly found worldwide in coastal areas of warm oceans, in rivers and lakes, and occasionally salt and freshwater streams if they are deep enough.
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AP'S ASSESSMENT: False. Bull shark sightings have been confirmed in the Mississippi River as far north as Alton, Illinois, but reports of the sharks being found in the Great Lakes are either hearsay or hoaxes, multiple experts told The Associated Press.
But Bull Sharks are able to recycle salt in their kidneys, maintaining salt levels critical to its survival. Yet even the Bull Shark would not be able to make its way into the Great Lakes watershed and survive! The water temperature in the Great Lakes is far too cold for most sharks (including the Bull Shark).
Lake Nicaragua in NicaraguaBull sharks travel up the San Juan River to Lake Nicaragua and sometimes spend years in the lake before returning to the Caribbean Ocean. Lake Nicaragua is a freshwater lake, and it's one of the largest in the Americas.