Catfish Below Mississippi River's Dams Are Turning Into Giants — And No One Knows How Big They Get

Something strange is happening in the deep water below the Mississippi River's dams — catfish are growing way bigger than anyone expected, and state records keep getting broken. An invasive fish turned out to be the perfect food source, and the still, deep holes below these dams turned out to be the perfect place to hide. But the biggest, oldest catfish act in a way that makes them nearly impossible to catch or even count. This video looks at why the true giants down there might still be completely unknown.