Devils Hole Pupfish
An entire species lives in one Nevada cavern, where a shallow limestone shelf, groundwater, algae, and sunlight determine its future.
Artwork inspired by Robert Cole Caples
Devils Hole Pupfish have the smallest known natural range of any vertebrate: A single geothermal pool connected to a deep aquifer. The fish are short-lived, eat algae and small invertebrates, and depend heavily on a shallow shelf where light supports food and spawning. Groundwater pumping can change the shelf even when the cavern still appears full.
Visitors view the fenced site from a distant platform; do not expect an aquarium-like sighting or attempt to approach the water. Binoculars may reveal tiny movement when light cooperates. Treat the protection infrastructure as part of the story: It exists because disturbance, vandalism, and changes to regional groundwater can affect every wild member of the species.
- Natural range
- One cavern
- Water
- About 33°C / 91°F
- Status
- Federally endangered
Quick guide
- Initial check
- Shallow spawning shelf
- Context cue
- Blue breeding male; habitat—One warm, deep, water-filled limestone cavern and its shallow sunlit spawning shelf
A low-impact field sequence for Devils Hole Pupfish
- Begin with form
- Begin with Shallow spawning shelf.
- Require another mark
- Confirm “Blue breeding male”.
- Place the observation
- Pair “One warm, deep, water-filled limestone cavern and its shallow sunlit spawning shelf” with “The fish can be monitored year-round, but public viewing is necessarily distant and variable”.
- Protect subject and habitat
- Observe Devils Hole Pupfish from a stable bank or platform where possible, without entering spawning cover or disturbing sediment.
Good to know
The viewing platform does not guarantee a fish sighting, and entering or reaching toward Devils Hole is illegal and dangerous. Visit for the aquifer story as much as for the possibility of seeing a tiny fish.
Notice these
- Shallow spawning shelf
- Blue breeding male
- Fenced limestone opening