In June 2022, nonnative, predatory smallmouth bass passed through the turbines of the Glen Canyon Dam into the #ColoradoRiver. Without swift action, these fish, invasive in the Southwest, might devastate native populations of threatened humpback chub and other native fish in the Grand Canyon.   In our new film, learn how USGS and partners are working diligently to address the threat of smallmouth bass in the Grand Canyon. Find a link to the film in today’s story or in our Life highlight.   The film covers how lower water levels in #LakePowell not only facilitate the passage of #smallmouthbass, which were introduced to the lake in the 1980s, through the dam and into the Grand Canyon, they also raise river temperatures to a degree in which smallmouth bass can successfully reproduce below the dam.   USGS scientists are collaborating with the nationalparkservice, bureau_of_reclamation, azgfd, and other partners to provide the best science to protect Grand Canyon ecosystems. USGS research i...