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A general run reconstruction model for the commercial sockeye salmon fishery in Bristol Bay, Alaska. This model leverages information from age and genetic composition samples to apportion mixed-stock catches and account for interception among terminal fishing districts.

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Bristol Bay Annual Run Reconstruction

Model Creators:

  • Dr. Curry J. Cunningham (University of Alaska Fairbanks, College of Fisheries and Ocean Sciences)
  • Dr. Trevor Branch (University of Washington, School of Aquatic and Fishery Sciences)

This run reconstruction model is detailed in A general model for salmon run reconstruction that accounts for interception and and differences in availability to harvest Cunningham et al. (2018).

Original Project Collaborators: Curry J. Cunningham, Trevor A. Branch, Tyler H. Dann, Matt Smith, James E. Seeb, Lisa W. Seeb, Ray Hilborn, Lowell Fair, Tim Baker, Fred West.

Purpose

A general run reconstruction model for the sockeye salmon fishery in Bristol Bay, Alaska. This model leverages information from age and genetic composition samples to apportion mixed-stock catches and account for interception among terminal fishing districts.

Workflow

Each year is estimated independently although some information is shared among years.

  1. R code creates ADMB input files in the /Syrah directory, based on input data in the /R directory.
  2. Formal run reconstruction model estimation by AD-Model Builder (ADMB) in /Syrah directory.
  3. Parsing annual ADMB output (.out) files into user-friendly tables and figures in the Syrah/outputFiles directory.

Syrah Model Versions

Name Description
Syrah Original version.
Syrah_v1 Original model + small update to estimate RunSize in log space.
Syrah_v2 Original model + small update to estimate RunSize in log space + updates from Hamazaki (ADFG) to likelihood formula (and perhaps other changes).

** NOTE: *** all versions are designed to be backward compatible with input (.dat) and output (.out) files. All upstream data input creation R functions, and output processing and data visualization R functions will operate normally, independent of version.

Structure

Directory Description
R ageComp.annual.csv
R GeneticsComp_updated_Annual.csv
R qry_Annual_ESCAPEMENT.csv
R qry_Annual_CATCH_updated.csv
Syrah/outputFiles/Reallocation catchAdd.csv
Syrah/outputFiles/Reallocation ageCompAdd.csv
Syrah/outputFiles/Reallocation inshoreTogiak.csv
Syrah/outputFiles/Reallocation offshoreCatchAdd.csv
Syrah Directory for running ADMB estimation model.
Syrah/outputFiles Holds ADMB estimation model output (.out files) and code to generate output figures

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A general run reconstruction model for the commercial sockeye salmon fishery in Bristol Bay, Alaska. This model leverages information from age and genetic composition samples to apportion mixed-stock catches and account for interception among terminal fishing districts.

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