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Science and Innovations

Three Colorado River Chubs May No Longer Qualify for Protection as Separate Species


Three types of chub in the Colorado River watershed may actually be the same species of fish. The finding raises questions about their protections under the federal Endangered Species Act.

The U.S. Fish and Wildlife Service proposed listing the headwater chub and roundtail chub as ‘threatened’ last year. A third fish—the Gila chub—is already listed as endangered.

But experts at the American Fisheries Society say it’s not possible to tell the three fish apart.  

“Their finding is that they’re all of the same species and therefore we can’t list them individually under the Endangered Species Act as separate species,” says Steve Spangle, Fish and Wildlife Service supervisor.

Spangle says the agency must reconsider the proposed listing and may have to take another look at the Gila chub’s endangered status. It’s unclear if the new ‘combined’ species would qualify for federal protection. Its population is larger and therefore more resilient to threats.

The agency is asking for public comments. It will make a decision on the species status by April.

Comments can be submitted to the Fish and Wildlife Service until 10 p.m. local time on Friday.

Melissa joined KNAU's team in 2015 to report on science, health, and the environment. Her work has appeared nationally on NPR and been featured on Science Friday. She grew up in Tucson, Arizona, where she fell in love with the ecology and geology of the Sonoran desert.
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