invasive species

Environmental advocates worry about the future of cool mix flows, which send water from Lake Powell to protect threatened humpback chub in the Grand Canyon.

The Bradford pear was one of the most widely planted ornamental trees in North America. But it's now largely considered invasive and outlawed in several states.

Federal officials are considering cool water releases for the third consecutive year at Glen Canyon Dam in Northern Arizona this summer to safeguard the humpback chub, a federally protected fish.

Federal agencies have finished digging out a side channel below Glen Canyon Dam that's been a breeding ground for nonnative fish.

National Park Service officials are working to eliminate a spawning ground for harmful nonnative fish in Glen Canyon.

The U.S. Bureau of Reclamation has begun water releases from Glen Canyon Dam to cool the temperature of the Colorado River and slow the reproduction of an unwanted fish threatening native species.

The U.S. Bureau of Reclamation is taking public comment on a proposal to disrupt the spawning of a nonnative fish in the Grand Canyon by releasing spikes of cool water from Glen Canyon Dam. Many in the Colorado River community want more options.

Federal officials say they’re one step closer to finalizing a plan to remove invasive fish from the Colorado River below Glen Canyon Dam.

Grand Canyon National Park will get more than a quarter-million dollars to remove invasive species and protect native species of fish in the Colorado River.

This weekend federal officials will begin another round of chemical treatments in the Colorado River meant to remove invasive fish. But environmentalists want more to be done to protect native species.