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Report of the Index-Based Methods Working Group
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2023
[PDF-70.69 MB]
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Description:The stock assessment program Woods Hole Assessment Model (WHAM) was used to generate data that exhibited strong retrospective patterns when assessed with an age-based approach. There were 2 alternative sources for the retrospective pattern: unaccounted catch and an unknown increase in natural mortality (M). The magnitudes associated with each source were modified according to the specific scenario to produce a Mohn’s rho of approximately 0.5 for spawning stock biomass. This is a strong retrospective pattern and comparable to retrospective patterns seen in some stock assessments in the region. There were 8 combinations of retrospective source, fishing history, and number of fishery selectivity blocks (each factor had 2 levels) that formed the 50-year base period. An index-based assessment was applied every other year during the next 40 years of the feedback period. The data available to the index-based methods (IBMs) contained noise in the observations, as would occur in actual stock assessments. For each scenario, IBM, and control rule combination, 1,000 closed-loop simulations were performed.
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Rights Information:CC0 Public Domain
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Compliance:Submitted
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