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Supplemental review of widow rockfish assessment constrained by federal staff absence; panel flags sensitivity to data-weighting and age inputs
Summary
The Pacific Fishery Management Councils groundfish subcommittee met for a supplemental review of the widow rockfish assessment and found that changes to data-weighting, fleet structure and age-composition inputs in the proposed base model produce materially different estimates for natural mortality and catch recommendations. The panel warned that the absence of federal stock-assessment staff constrained the depth of review.
The Pacific Fishery Management Councils groundfish subcommittee convened a supplemental review of the widow rockfish stock assessment to evaluate a proposed updated base model and the responses to 14 review requests. Chair Cheryl Barnes opened the session by noting that the meeting was recorded and that the "PAM" website contains the assessment reports, model files and previous assessments for review.
The panels charge was to determine whether the update represents the best scientific information available and is appropriate for use in conservation and management, and to identify any additional research needs. Barnes told the group that the proposed model incorporates several notable changes since the August draft: a simplified fleet structure, revised historical catch reconstructions for Washington, a change in composition data weighting (McAllister nd—[Ianelli] -> Francis weighting with lambda adjustments), a length-based fecundity relationship, and a revised recruitment-bias adjustment start year.
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