Have you ever wondered if you might spot a shark during your visit to Niagara Falls? While the chances are slim, there is one type of shark that could potentially survive briefly in the Great Lakes. Marine Ecology expert Amber Peters from Michigan State University’s Department of Fisheries and Wildlife explains, "A shark may not thrive given the winter temperatures and lack of ample food, but if one happens to swim into the lake, it could possibly survive for a bit."
Bull sharks are a rare example of a shark species that can adapt to both fresh and saltwater environments, displaying greater physiological flexibility than their 374 counterparts. National Geographic reports that bull sharks have been found in freshwater bodies all around the world, including the Amazon and the Mississippi River.
There have been reports of bull shark sightings in Lake Michigan, which is adjacent to Lake Erie which feeds water to Niagara Falls. However, none of these sightings have been scientifically verified.
It is important to note that sharks are likely to find the fresh waters of the Great Lakes less hospitable, as Amber Peters points out. Limited food sources and companionship pose challenges for their survival. The typical prey in freshwater is smaller than what sharks usually hunt in the ocean which can have an adverse effect on their diet. Additionally, the stress of adapting to a completely different environment adds to their difficulties.
From a practical standpoint, it is highly unlikely for a bull shark to navigate its way up to the upper Great Lakes from the Atlantic coast via the St. Lawrence River. The sophisticated lock system and the formidable challenge of ascending the majestic Niagara Falls make it almost impossible. Furthermore, the electric barrier in Chicago, designed to deter invasive species, makes the journey towards Lake Michigan practically unattainable for them.
While there is a minor possibility, visitors can rest assured that the chances of spotting any shark fins breaking the surface of the water during their Niagara Falls vacation are highly unlikely.