Something Is Swimming Up America's Rivers That Shouldn't Be Able to Survive There!
In 1937, two fishermen near Alton, Illinois pulled a bull shark out of the Mississippi River, roughly 1,740 river miles from the sea. It is still the farthest inland a shark has ever been confirmed in North America. For decades it was written off as a fluke. It wasn't. Bull sharks rewrite their own body chemistry to survive freshwater, and in Lake Pontchartrain researchers keep pulling up pups still carrying umbilical scars. They aren't lost out here. They're being born here. Which river or lake are you closest to? Drop it below. SOURCES: Thomerson, Thorson & Hempel (1977), Copeia — the original scientific record of the 1937 Alton bull shark: https://doi.org/10.2307/1443522 Shell & Gardner (2021), Marine and Fishery Sciences — bull shark movement in the upper Mississippi River Basin: https://doi.org/10.47193/mafis.342202... Shell, Gardner & Hrabik (2023), Marine and Fishery Sciences — the correction reclassifying the 1995 Rush Island case as a probable hoax: https://doi.org/10.47193/mafis.361202... Reilly et al. (2011), Journal of Experimental Biology — how bull sharks osmoregulate in freshwater: https://journals.biologists.com/jeb/a... FOX 8 New Orleans — Louisiana Dept. of Wildlife & Fisheries tagging program, juveniles with umbilical scars in Lake Pontchartrain: https://www.fox8live.com/story/325405... WGNO New Orleans — the 2014 bite on 7-year-old Trent Trentacosta, with UNO researcher Martin O'Connell on the lake nursery: https://wgno.com/news/sharks-in-lake-...
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