FLAGSTAFF, Ariz. (AP) — An endangered fish that makes its home in the Colorado River basin no longer is at the brink of extinction.

The U.S. Fish and Wildlife Service said Thursday it will consider reclassifying the humpback chub as threatened within the next year.

The fish is characterized by a fleshy hump behind its head. The biggest population — about 12,000 adults — is near the confluence of the Colorado and Little Colorado rivers in the Grand Canyon.

Four smaller populations are found upstream of Lake Powell in Utah and Colorado.

Federal officials says managing the flow of water from dams on the river and its tributaries, and removing fish that feed on humpback chub have helped boost their numbers.

But they say the species won't fully be recovered without more work.