Biologists try to save ancient fish as Colorado River fades
Barrett Friesen steers a motorboat toward the shore of Lake Powell, with the Glen Canyon Dam towering overhead. Pale “bathtub rings” line the canyon’s rocky face, starkly illustrating how water levels have slumped in the second-largest U.S. reservoir amid rising demand and a multi-year drought. The Utah State University graduate student and colleagues are on a mission to save the humpback chub, an ancient fish under assault from nonnative predators in the Colorado River.