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Coho - Oregon Coast ESU
The Oregon Coast Coho Evolutionarily Significant Unit (ESU) encompasses Oregon coastal watersheds from the Necanicum River in the north to the Sixes River in the south.
According to the Oregon Workgroup of the Oregon Northern California Coast Technical Recovery Team (TRT), the Oregon Coast Coho ESU is comprised of a total of 56 historical populations. Thirteen populations are identified as functionally independent, eight as potentially independent, and 35 as dependent populations. For more information on the Oregon Coast Coho ESU population structure see Lawson et al. 2007.
Currently, Oregon Coast coho are listed as threatened under the United States Endangered Species Act. In 2007, based on guidance provided by ODFW’s Native Fish Conservation Policy, the State of Oregon completed the Oregon Coast Coho Conservation Plan. The plan establishes benchmarks or “measurable criteria” designed to facilitate tracking of progress towards goals for abundance, persistence, productivity, distribution and diversity of Oregon Coast coho populations as well as the condition of their habitat. With the exception of spawner abundance, the goals established for these measurable criteria are available only at the population scale.
Progress
At the ESU level, the only measurable criterion available is spawner abundance.
Description
Annual estimates of the abundance of naturally-produced spawners for this ESU.
Evaluation Thresholds
Pass -the observed spawner abundance is > the marine survival-specific escapement target at least six times in any 12-year period.
Fail - the observed spawner abundance is > the marine survival-specific escapement target 5 times or less in any 12-year period.
Pass/Fail Category
| Time Period | Category | Comment |
|---|---|---|
| 1998 - 2009 | Fail | Goal met 1 of 12 years |
Trend
Map
View the ESU and strata boundaries. Select a stratum on the map or from the list on the right.