Which freshwater fish is known for living in Devils Hole, a tiny geothermal pool in Nevada?

The Devils Hole pupfish is the freshwater fish known for living in Devils Hole, a tiny geothermal pool in Nevada. Its entire natural range is confined to this isolated habitat in Death Valley National Park.

Devils Hole is a submerged cavern with very limited shallow shelf habitat, so the fish has an exceptionally small available living area. The water remains warm year-round, and the population has faced pressure from changes in habitat conditions and water levels.

The species is closely monitored by conservation agencies and researchers. It is often confused with the desert pupfish, another desert fish, but Devils Hole pupfish are a distinct species, Cyprinodon diabolis, recognized for their extremely restricted distribution.