(John Doman / Pioneer Press) Wondering how long the Mississippi River is? Or how much water ... long-nosed gar, flathead and channel catfish, lake and shovelnose sturgeon, paddlefish, Asian ...

Flathead catfish—native to the Mississippi River basin—were first detected in the Susquehanna River in Pennsylvania in 2002, according to the U.S. Geological Survey. In the two decades since ...