Olympic mudminnow (Novumbra hubbsi)

Category: Fish
State status: Sensitive
Vulnerability to climate change (More details)


Climate vulnerability

Sensitivity to climate change


Olympic mudminnows occupy slow-moving streams, ponds, and freshwater wetlands at lower elevations with minimal water flow and ample aquatic vegetation. This species appears to be fairly tolerant of temperature and oxygen fluctuations, but has been documented to seek out cooler water temperatures and shaded areas during summer temperature peaks. Relative intolerance of swift water limits Olympic mudminnow distribution to lowland areas, and in combination with salinity intolerance, may make them vulnerable to sea level rise and saltwater intrusion in current wetland habitat, although no studies examining this risk have been conducted. This species is likely to be sensitive to any hydrological shifts (e.g., low flows, flood timing and magnitude, altered sediment delivery) that affect freshwater wetland availability, function, and composition. Limited geographic range in the Puget Sound trough may make them more vulnerable to loss of habitat (climate change related and other).

Confidence: Low

Exposure to climate change


  • Increased high flood events
Confidence: Moderate


This species is identified as a Species of Greatest Conservation Need (SGCN) under the State Wildlife Action Plan (SWAP). SGCN-classified species include both those with and without legal protection status under the Federal or State Endangered Species programs, as well as game species with low populations. The WDFW SWAP is part of a nationwide effort by all 50 states and five U.S. territories to develop conservation action plans for fish, wildlife and their natural habitats—identifying opportunities for species' recovery before they are imperiled and more limited.
This species is identified as a Priority Species under WDFW's Priority Habitat and Species Program. Priority species require protective measures for their survival due to their population status, sensitivity to habitat alteration, and/or recreational, commercial, or tribal importance. The PHS program is the agency's main means of sharing fish and wildlife information with local governments, landowners, and others who use it to protect priority habitats for land use planning.