In 2009, Illinois treated a six-mile canal with more than 1,800 gallons of rotenone; crews recovered one bighead carp after the fish kill

Illinois treated a canal section with rotenone to combat invasive fish. This operation killed many fish and recovered one bighead carp. The Chicago Sanitary and Ship Canal connects two major water systems. Asian carp pose a threat to native species and food webs. The rotenone treatment confirmed the carp’s upstream movement past a barrier.
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