It is possible the lock-and-dam complexes are slowing them down, but they have already passed numerous lock-and-dam complexes elsewhere. Perhaps there is not enough plankton, their food?
But Gizzard Shad and other plankton eating fishes are abundant in the area. I once thought pollution coming out of Chicago was slowing them down, but the Asian Carp appear to be more numerous in the Des Plaines River (which receives Chicago’s pollution) than in the nearby Kankakee River (which is relatively cleaner). Plus, Asian Carp have not had trouble with pollution elsewhere. Lack of oxygen dissolved in the water has been suggested, but that does not seem to explain this either. All we know is that some environmental variable(s) is slowing them down, but not stopping their movement towards Lake Michigan.
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