Study shows invasive silver carp reduce movement in Chicago-area water

Invasive silver carp have been spreading throughout the Mississippi River Basin since their introduction a half-century ago. Yet, try as they might, the fish have not advanced beyond a particular stretch of the Illinois River north of Kankakee. Research from the University of Illinois Urbana-Champaign shows the fish are likely avoiding contaminants from the Chicago Area Waterway, which flows south before petering out around Kankakee.