Taylor McKinnon

The chub only lives in the Colorado River system.

Now, advocates warn that changes to the amount of water released from Lake Powell could let invasive fish into a critical habitat.

Taylor McKinnon with the Center for Biological Diversity says efforts to address the shrinking river haven't done enough to consider wildlife.

Newly announced federal plans will keep hydropower equipment running at the nation's second largest reservoir, but McKinnon says those same plans could erase decades of work for fish in the Grand Canyon.

For NPR News, I'm Alex Hager in Phoenix.