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Increase in humpback chub population in and around Grand Canyon NP may lead to easing of ESA status

Growth in the population of the humpback chub, an endangered fish in the Colorado River system, has the U.S. Fish and Wildlife Service proposing that the species be upgraded to "threatened" under the Endangered Species Act.

The Service recently completed a species status assessment and a 5-year status review that concluded the current risk of extinction is low, such that the species is not in danger of extinction throughout all of its range. The SSA explained that the largest population of humpback chub, which is found in the Colorado and Little Colorado rivers in Grand Canyon National Park is a stable population of about 12,000 adults.



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