Invasive flathead catfish now the apex predator in Pennsylvania’s Susquehanna River

Flathead catfish, opportunistic predators native to the Mississippi River basin, have the potential to decimate native and recreational fisheries, disrupting ecosystems in rivers where they become established after their introduction or invasion from a nearby river drainage.
That concern led a team of researchers from Penn State, the U.S. Geological Survey and the Pennsylvania Fish & Boat Commission to assess how flatheads are affecting the food web and energy flow in the Susquehanna River in Pennsylvania.

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