Bull Sharks Keep Being Found Deep Inside American Rivers — And They're Closer Than You Think

Bull Sharks Keep Being Found Deep Inside American Rivers — And They're Closer Than You Think Bull sharks are one of the few large sharks that can survive in freshwater — and they've been found more than 1,000 miles up the Mississippi River, deep inside the United States. This is the strange true story of how bull sharks enter American rivers, estuaries, and lakes, why they can survive where other sharks cannot, and why they may be closer to where people actually swim than most people realize. From the 1937 bull shark found near Alton, Illinois, to modern sightings in rivers like the Potomac, this video breaks down what scientists have confirmed, what the internet exaggerates, and what still remains unexplained. The truth is rarer — and stranger — than the rumor. Sources — Shell, R. & Gardner, N. (2021). “Movement of the bull shark (Carcharhinus leucas) in the upper Mississippi River Basin, North America.” Marine and Fishery Sciences. Main source for the 1937 Alton, Illinois record, the 1995 Rush Island / Festus, Missouri record, and the rare 1,000+ mile upstream Mississippi journeys. https://dialnet.unirioja.es/descarga/... — Florida Museum of Natural History — Bull Shark species profile. Species profile for Carcharhinus leucas: size, body shape, habitat, salt/freshwater ability, and general biology. https://www.floridamuseum.ufl.edu/dis... — Florida Museum of Natural History — Shark Biology. Freshwater tolerance, bull sharks and speartooth sharks, juvenile nursery areas, and upstream freshwater records including the Mississippi, Amazon, and Lake Nicaragua. https://www.floridamuseum.ufl.edu/dis... — Gausmann, P. (2024). “Who’s the biggest fish in the pond? The story of bull sharks (Carcharhinus leucas) in an Australian golf course lake.” Marine and Fishery Sciences. Main source for the Carbrook golf course lake case near Brisbane: six bull sharks landlocked from 1996 to 2013, surviving for 17 years and reaching maturity. https://ojs.inidep.edu.ar/index.php/m... — Chesapeake Bay Program — Bull Shark field guide. Useful for bull sharks as summertime visitors in the Chesapeake Bay region and for general size/habitat context. https://www.chesapeakebay.net/discove... — NBC Washington — “8-Foot Shark Caught in Potomac River.” Local reporting source for a bull shark caught in the Potomac River near St. Mary’s County, Maryland. https://www.nbcwashington.com/news/lo... #bullshark #shark #wildlifedocumentary