This indicator evaluates the abundance values and their trends of five Puget Sound coho salmon management units as measured by the number of natural-origin adult fish on the spawning grounds. Abundance estimates here do not include hatchery-origin fish or coho salmon taken in harvest or by predators like orcas. The indicator is intended to reflect the abundance of wild coho salmon in Puget Sound, which are not federally listed under the Endangered Species Act.
Annual percent change in coho salmon management unit spawner abundance from 2000 to 2021 for each Puget Sound management unit. The lines show the 25th to 75th credibility intervals (CIs). CIs represent a range of values the true annual percent change likely falls within. All CIs contain zero, suggesting no statistically significant change in spawner abundance from 2000 to 2021 for all management units.
Key Vital Sign Indicator Results
- Spawner abundance estimates of five management units of Puget Sound coho salmon have not changed significantly since the reference year of 2000.
- Abundance of the five Puget Sound coho management units relative to their low/normal escapement abundance breakpoint ranges from 69% to 172% (see the indicator map). Recent 5-year geomean abundance of three management units are between 90% and 98% of their breakpoints. These breakpoint values determine the allowable harvest in a given year and help to establish the framework for sustainable harvest.
Contributing Partners
Target
No targets are currently set for this indicator.
Data Source
Washington co-manager agreed-to datasets, as provided by WDFW staff including WDFW Fish Program District Biologists