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A sign warns boaters and barge operators that they are about to enter an electric barrier fish barrier zone on the Chicago Sanitary and Ship Canal. The barrier is the last line of defense for an Asian carp invasion of Lake Michigan.

A sign warns boaters and barge operators that they are about to enter an electric barrier fish barrier zone on the Chicago Sanitary and Ship Canal. The barrier is the last line of defense for an Asian carp invasion of Lake Michigan.