Inland redband trout (landlocked pops) (Oncorhynchus mykiss gairdneri)

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Category: Fish
Vulnerability to climate change (More details)


Climate vulnerability

Sensitivity to climate change


Inland redband trout are likely sensitive to increasing water temperatures and altered flow regimes. While redband trout can persist in desert streams that often exceed 20˚C through what appears to be local physiological adaptation, increased water temperatures pose a threat to this species because though their thermal optima is higher than other salmonids, their thermal maxima is similar. Further, warming temperatures may lead to increased nonnative species invasion or competition with native “cool water” fishes such as cyprinids and catostomidae. Inland redband trout spawn in the spring, thus their embryos and recently emerged fry may be sensitive to changes in the timing and magnitude of spring runoff. Lower summer flows may decrease habitat volume and access to headwater reaches for this species. Inland redband trout exhibit broad phenotypic (e.g., age-at-maturity, frequency and timing of spawning, temperature tolerance, etc.) and life history diversity, which may decrease overall sensitivity of this species.

Confidence: Moderate

Exposure to climate change


  • Increased water temperatures
  • Altered timing/magnitude of spring runoff
  • Lower summer flows
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.