The Devils Hole pupfish, considered one of the world's most endangered fish, has shown a remarkable population rebound in Southern Nevada. During a fall count at Death Valley National Park's Devils Hole, biologists recorded 137 fish, a substantial increase from 77 counted last spring and 69 last fall.
Death Valley National Park Superintendent Mike Reynolds credited the progress to the dedication of scientists and conservation partners. "These results reflect the dedication of our scientists and conservation partners working to protect this extraordinary species," Reynolds said in a statement. "While challenges remain, we're encouraged by this progress and committed to its long-term survival."
The species has been protected under the Endangered Species Act since 1967 after groundwater pumping from ranching and agriculture threatened its habitat. The U.S. Supreme Court upheld federal protection of the water levels in the 1976 Cappaert v. United States decision. The National Park Service and U.S. Fish and Wildlife Service have conducted biannual counts since 1972.
Recent recovery efforts include the release of 72 captive-bred pupfish into Devils Hole between March 2025 and February 2026 from a 100,000-gallon tank that replicates the natural habitat. Biologists note that most of the 137 fish observed during the fall survey hatched and grew in Devils Hole, as the species only lives 10 to 14 months.
The habitat remains vulnerable to earthquakes, which can disrupt algae and food sources. While two earthquakes in 2025 contributed to population declines, an October quake originating in Panama did not destabilize the population. Officials say continued monitoring, research, and habitat management are essential for the species' long-term survival.
Sources: Las Vegas Review-Journal
Original reporting: Las Vegas Review-Journal →
English (US)·