Environmentalists say a plan to boost Lake Powell could hurt the humpback chub, a threatened species that lives downstream.

Humpback chub — it’s a fish. Giggles seem to materialize with the mere utterance of the name. But it is really a fish and not some kind of human activity or function. The fish is native to Colorado ...

LAS VEGAS — Federal protections could soon be extended to a rare Nevada fish that environmentalists say is “barely clinging to existence" because of rapid groundwater pumping in a remote region ...