1. Home
  2. Research
  3. Projects
  4. Improve the yellowfin tuna stock assessment:Explore alternative hypotheses of stock structure and life-history for YFT in exploratory stock assessment models
Project H.1.b-2 - Improve the yellowfin tuna stock assessment:Explore alternative hypotheses of stock structure and life-history for YFT in exploratory stock assessment models

01 Jan 2021 - 31 Dec 2024

Program(s) in charge: Stock Assessment Program
Funded
Objectives
Improve the yellowfin tuna stock assessment by exploring alternative hypotheses of stock structure and life-history 
Background
A benchmark assessment was conducted in 2020 with 48 models representing several hypotheses for the stock. The main overarching hypotheses, stock structure, was not possible to address extensively
Relevance for management
  • The stock assessment is used to provide management advice
  • The duration of recommended seasonal closures is based on risk analyses of  bigeye and yellowfin that use the assessment results
  • Improvements in the yellowfin assessment will make the staff’s management advice more accurate and precise
Duration
2021-2024
Workplan and status
  • 2021: Re-evaluate the natural mortality assumptions
  • 2022-23: Explore different hypotheses on stock structure
  • 2022: Workshops to finalize improvements to the longline CPUE and length-composition data (Projects H.1.e – ext and H.1.f) 
  • 2023: Re-evaluate the model assumptions and implement exploratory models
  • 2024: Benchmark assessment
Deliverables
Report(s) to SAC in 2022, 2023 and 2024