In June, Newsweek magazine reported that the ratio of male to female white suckerfish in Colorado's Boulder Creek was 50: 50 upstream, but near a wastewater treatment plant downstream there were five females for every male and an abundance of fish that had both male and female characteristics. The reason for the changes was found to be hormones in the water.
6 月中旬，美國「Newsweek」雜誌刊載，全美各地調查發現，河流中原來雌雄各半的的鰷魚，如今雄魚數量大幅減少，部分雄魚身上還同時出現了兩性特徵，推估禍首是河水中的「環境荷爾蒙」（即存在於環境中，會干擾生物內分泌的物質）。