Many hoses connect to the side of the steeppass fish-sorting system at the Emiquon Preserve near Lewistown on May 17, 2021. Nora Hargett, left, and Stephanie Schmidt, graduate students from the ...

There may come a day on the Illinois River when a fish swims up a chute, slides through a scanner, and, after being recognized as a feared silver carp, is sorted and removed, eventually ending up in a ...