Moapa Dace
A small fish found nowhere beyond Nevada’s Warm Springs depends on flowing desert water that stays warm, clear, and connected all year.
Artwork inspired by Jack Malotte
Moapa Dace evolved in thermal spring outflows where water near 32°C supports constant activity. It feeds on drifting invertebrates and needs swift, clean channels; altered flow, invasive fish, fire, vegetation change, and barriers reduced its range to a fraction of the upper Muddy River system.
Public observation is limited and should never involve entering spring channels. At permitted overlooks, use polarized glasses and watch for fish holding head-first into current. Do not release aquarium animals, bait, plants, or water anywhere in the watershed, because a small invasive introduction can spread through the species’ entire range.
- Global range
- Moapa warm springs
- Water
- Warm and flowing year-round
- Status
- Federally endangered
Quick guide
- Opening clue
- Current-holding posture
- Independent check
- Reddish fins; habitat—Clear thermal spring outflows and connected channels in the upper Muddy River system
Four field checks for Moapa Dace
- Take the whole view
- Use “Current-holding posture” as the opening clue.
- Separate the alternative
- Next, document “Reddish fins”.
- Record habitat and season
- Treat “Clear thermal spring outflows and connected channels in the upper Muddy River system” as supporting context, not proof by itself.
- Finish without disturbance
- Observe Moapa Dace from a stable bank or platform where possible, without entering spawning cover or disturbing sediment.
Good to know
Most occupied habitat is protected or access-controlled. A closed gate is conservation, not an invitation to find another route; use only designated viewing areas and current refuge guidance.
Notice these
- Current-holding posture
- Reddish fins
- Thermal spring channel