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Adult Bull Trout Trends & Abundance


View trends and abundance by clicking on recovery units.
CoastalMid-ColumbiaColumbia HeadwatersUpper SnakeSt. Mary
  •   * The trend designation is a generalized average of the recovery unit’s core area trends.
  • ** Columbia River Basin populations

Bull trout populations throughout the Columbia River Basin are listed as federally threatened under the Endangered Species Act. In 2011, six bull trout recovery units were identified (i.e., Coastal, Klamath, Mid-Columbia, Upper Snake, Columbia Headwaters, and St. Mary/Belly), based on data that suggest bull trout within each recovery unit share a common evolutionary legacy and future.

Estimating range-wide bull trout abundance is difficult due to sampling variability, differences in methods used to estimate abundance, and a complete lack of data in some areas. Subsequently, a reliable range-wide estimate is not available.

Following the release of the Draft Bull Trout Recovery Plan, the USFWS conducted a 5-year status review. Although range-wide abundance and trend estimates are not available, estimates are available for some core units. For several cores units, population size and trend are unknown due to the lack of information.

For a comprehensive review of the estimated abundance and trends, please refer to:

Adapted from:
Koskim M.L. and T.A. Whitesel. 2013. Bull Trout Recovery Planning Activities, 2011 and 2012 Progress Report. U.S. Fish and Wildlife Service, Columbia River Fisheries Program Office, Vancouver, WA. 46 pp.

U.S. Fish and Wildlife Service. 2008. Bull Trout (Salvelinus confluentus) 5-Year Review: Summary and Evaluation. U.S. Fish and Wildlife Service. Portland, OR. 55 pp.