A fish that has dwelt in the Colorado River since ancient times, and whose presence indicates a healthy river, now faces a threat from a giant dam above. Officials are trying to devise a strategy to keep the humpback chub safe from predators upstream.
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. The reservoir’s decline may soon make things worse, enabling these introduced fish to get past the dam to where the biggest groups of chub remain, farther downstream in the Grand Canyon.
That stretch of river is the only place native fish still dominate the system, said Brian Healy, fisheries biologist for Grand Canyon National Park. “ is very unique and we want to keep it that way,” he said. The chub has gained ground since its listing as endangered in 1967, with about 12,000 in the Grand Canyon’s Little Colorado River, a tributary of the Colorado. Scientists estimate thousands more inhabit the main river farther downstream.
One measure under consideration if nonnative predators get through the dam is deploying crews to catch as many as possible. They already do that with brown trout upstream, Yackulic said. But it’s expensive and not always successful. Native American tribes such as the Pueblo of Zuni consider the Glen Canyon area sacred and oppose killing fish there, any fish.
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