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- Improve the yellowfin tuna stock assessment:Explore alternative hypotheses of stock structure and life-history for YFT in exploratory stock assessment models
- 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