In 2014, Arizona treated a section of the Virgin River with rotenone after years of mechanical removal fell short; red shiner was temporarily eradicated between two barriers

For years, dedicated conservation crews battled against invasive red shiner fish in the Virgin River. Utilizing rotenone treatments, they cleared specific segments of the river, while implementing barrier modifications to thwart any return of these pests. To effectively disrupt the fish’s reproductive cycle, multiple treatments were essential, ultimately leading to a successful eradication effort that opened the river to native fish populations once again.
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