Moapa coriacea: The Moapa dace were common in the Muddy River when they were discovered in 1938. However, human caused changes to their habitat have made it hard for the dace to survive. To improve the dace’s habitat the USFWS and partnering organizations have restored natural stream courses, removed wildfire prone palm trees, planted native species, and installed fish barriers to prevent the predacious blue tilapia from entering the refuge.

Crenichthys baileyi moapae: As the most prevalent fish on the refuge it is easy to spot a White River spring fish on the refuge. Spring fish feed on algae and other organisms floating in the water, but they also pick food off of rocks and sticks.

Limnocoris moapensis: Feeding on insects and crustaceans, the Moapa naucorid is the hunter of the streams. Look for the hooked protrusions on the side of its shell to distinguish it from all other naucorids. (Appox. Size 4mm)

Microcylloepus moapus: Living at the bottom of the stream beds or under vegetation, you won't have much of a chance to see the Moapa riffle beetle. They feed on dead vegetation. (Approx. Size 3mm)

Stenelmis moapa: Like the Moapa riffle beetle, the Moapa Warm Springs riffle beetle is only found in the springs on and near the refuge. (Size Approx. 3mm)

Pyrgulopsis avernailis: By far the most prevalent species in the streams, thousands of Moapa pebble snails can be seen clinging to rocks and submerged sticks. (Size Appox. 3mm)