humpback chub

As America's large reservoirs on the Colorado River drop to record-low levels, fish are among those suffering the impact.

The National Park Service on Saturday will begin using a pesticide to remove invasive smallmouth bass and green sunfish from the Colorado River below Glen Canyon Dam.

Humpback chub in the Grand Canyon have flourished under long-running restoration efforts. But now, exotic fish that prey on chub and other native fish have begun to slip through Glen Canyon Dam. It’s an unprecedented problem caused by the drought-stricken low levels of Lake Powell. KNAU’s Melissa Sevigny spoke with National Park Service fisheries biologist Melissa Trammell about her concerns.

A key fish that has lived in the Colorado River for millennia, and whose presence indicates a healthy river, is now up against a threat from a giant dam above.

The US Fish and Wildlife Service has downlisted a Colorado River fish from endangered to threatened. KNAU’s Melissa Sevigny reports, the agency says the…

The U.S. Fish and Wildlife Service has reclassified a rare Colorado River Basin fish called the humpback chub from endangered to threatened status after a…

A Phoenix-based company has withdrawn its applications for two hydro-storage projects on the Little Colorado River. A third such proposal, however,…

Federal officials have issued preliminary permits for two hydro-storage proposals on the Little Colorado River. The projects would include four dams and…

The U.S. Interior Department in November filed a series of comments critical of two hydro-storage dam proposals on the Little Colorado River. One of the…

The Trump administration is proposing to reclassify the humpback chub’s status under the Endangered Species Act from endangered to threatened. KNAU’s Ryan…