Chinook Management Overview

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Chinook Management Overview

• Rishi Sharma
• Columbia River Intertribal Fish Commission
• University of Washington, Quantitative Ecology
  Resource Management

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Overview

• Catch and stock abundances over fisheries and
  time.
• Overview of current approach intricacies.
• Possible approaches to use in Harvest management
  taking climate into consideration.

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Area and Jurisdiction of the Pacific Salmon Treaty
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Abundance trends over time
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Ocean Catch trends over time
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Columbia Abundance over time
URB Mean 174,431 Up River Sp
111,228 Willamette Springs 78,840
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Columbia River Catch trends over time
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Current Approach-Key Components

• Relies on information derived from the Coded Wire
  Tag (CWT) Program.
• Terminal run forecasts.
• Externally estimated Stock Production Functions.
• Tuned Virtual Population Analysis (VPA).
• Estimates environmental variability.
• Projects current year abundance (based on above).

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PNW Chinook Stock Abundances over time
Far North (AK Northern BC)
Fraser River
WCVI Georgia St
Puget Sound
Columbia River
Snake River
WA OR Coast
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Approaches to use in long term management of
stocks

• Determine a Environmental signal for the stock of
  concern.
• Devise regime based stock production functions
  for management.

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Regime based Production Functions
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Overarching conundrum

• How do we know which regime we are in?
• How do we account for issues of scale long term
  climate signals versus yearly management cycles?