Predator fish penetrate last precarious preserve
A virulent and voracious species of invasive fish has penetrated the ecologically delicate waterways of the lower Colorado River, The Associated Press reported. The presence of smallmouth bass below the critical barrier of the Glen Canyon dam means an existential threat to chub, an ancient native fish, according to the AP. Wildlife biologists have long dreaded the day when the bass — a sport fish introduced into the freshwater lakes of the West — would make it through the dam to attack the threatened chub, as we reported in June.