But Heithaus said it would not be possible for a bull shark to reach the Great Lakes on their own because most don't travel very far upstream. If one did reach the lakes, it would not be able to survive due to the cold water temperature.
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While there have been past “sightings,” most have turned out to be pranks or misidentifications. The reality is that the largest of the Great Lakes (Lake Superior and Michigan) are extremely deep lakes that are too cold for sharks.
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.
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.
The most dangerous predator in the Great Lakes is the sea lamprey, which was actually introduced as an invasive species. Primarily, it goes after a sports fish called the lake trout, often wounding them as they kill them off. It is also attracted to the blood and bodily fluids of any creature.