Salmon Watersheds Program

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Estimates of a Biologically-Based Spawning Goal and Management Benchmarks for the Canadian-Origin Taku River Sockeye Salmon Stock Aggregate

The purpose of this paper is to identify a range of spawning escapements that would likely result in maximum sustained yields and identify the appropriate biological benchmarks (management reference points) for management of the Canadian-origin Taku River Sockeye salmon (Oncorhynchus nerka) stock aggregate. A Bayesian state-space Ricker model that included age-structure and a one year-lag autoregressive component was fit to 1980–2018 data for Taku River Sockeye salmon greater than 349 mm mid eye to fork length. Data for the state-space model included:

  1. Estimates of harvest of naturally-spawned and enhanced (hatchery-produced) Sockeye salmon above and below the U.S./Canada border in the lower Taku River;
  2. Pooled Petersen capture-recapture estimates of above-border abundance; and
  3. Weighted age composition estimates of Taku River Sockeye salmon harvested in the U.S. District 111 traditional commercial drift gillnet fishery and Sockeye salmon captured in the Canyon Island fish wheels in the lower Taku River.