According to a recent study by Canada’s Department of Fisheries and Oceans, only ten females (and the minimum required males) are needed to establish an Asian Carp population in the Great Lakes.
Attempts to use fish barriers have yielded some success, but stronger measures are being discussed to keep these fish form invading the Great Lakes.
Restoring the natural divide to reinstate the physical barrier to keep these fish out seems to be one of the best argued solutions. However, this would have major effects on the commercial boating industry. Which is why it has charged such a heated debate.
It’s an unprecedented plan, but seems worth a closer look.