Evaluating Factors Related to Inriver Adult Mortality in Copper River Sockeye Salmon

Salmonid Research, Monitoring, and Evaluation (RM&E)

Project IDAK54013
Recovery Domains -
Start Date03/01/2021
End Date12/01/2023
Last Edited01/31/2023
1 - 1


There are indicators that sockeye salmon (Oncorhynchus nerka) of the Copper River, an important population that supports subsistence fisheries in southcentral Alaska, is subjected to elevated inriver mortality during their spawning migration that may be linked to climate change. This mortality has implications for maintaining upriver escapement levels, representing a fundamental challenge to the management of subsistence fisheries in this region. This project will evaluate how changing body size, condition, and overall health of Copper River sockeye salmon may be related to inriver mortality. This work will inform fisheries management and provide insight into how harvest management might adapt to these changes in the future.

Project Benefit    

As the climate changes, addressing escapement quality, in addition to escapement quantity, is becoming an increasingly important component of contemporary fisheries management. The evaluation of the risk of inriver mortality and reproductive performance in CR sockeye will help managers determine if the discrepancy between lower and upper river escapement estimates could have a biological or ecological basis. This analysis could result in allowances for additional levels of escapement through harvest management to ensure sustainability of run-timing groups or populations that may be a concern, thus ensuring that subsistence opportunities are protected and maximized.


Metric Completed Originally

Funding Details

Report Total:$385,686

Project Map



  • Worksite Identifier: 48597296
  • Start Date:
  • End Date:
Area Description

No Area Description data was found for this worksite.

Location Information

  • Basin: Copper River
  • Subbasin:
  • Watershed:
  • Subwatershed:
  • State: Alaska
  • Recovery Domain:
  • Latitude: 60.77395
  • Longitude: -144.5218333


  • Un-Named ESU Chinook




  • E.0 Salmonid Research, Monitoring, and Evaluation (RM&E)Y (Y/N)
    •      . . E.0.a RM&E Funding .00
    •      . . E.0.b
      Complement habitat restoration project
    •      . . E.0.c
      Project identified in a plan or watershed assessment.
    •      . . E.0.d.1 Number of Cooperating Organizations
    •      . . E.0.d.2
      Name Of Cooperating Organizations.
    •      . . E.2 ResearchY (Y/N)
      •      . . . . E.2.a Research Funding
      •      . . . . E.2.b.4 Life history studyY (Y/N)
        •      . . . . . . E.2.b.4.a
          Key issues addressed by life history research