- Objectives
- Estimate abundance and fishing mortality rate of skipjack tuna from recent tagging data while accounting for mixing rates
- Background
- Currently, no assessment is available for skipjack tuna in the EPO • Tagging data has been collected in several recent tagging cruises
- Practicalities of tagging skipjack limit the spatial distribution of tag releases
- The short-lived nature of skipjack tuna necessitate the modelling of mixing rates
- Spatio-temporal models of abundance are combined with advection-diffusion of tags to model the tagging data and estimate absolute abundance and fishing mortality
- Relevance for management
- Provides estimates of abundance and fishing mortality that can be used in stock assessments or compared with proxy reference points
- Duration
- 3 years
- Workplan and status
- Contract analyst
- Develop model
- Apply model to updated data
- Present methods and results at SAC
- Publish paper
- External collaborators
- To be determined
- Deliverables
- Report presented at SAC 2024
- Published paper
- Updated date: 01 May 2024
- Progress summary for the reporting period
- Initial analysis of tagging data conducted
- Challenges and key lessons learnt
- The analysis is computationally demanding, but switching methodologies solved this issue
- Future work needs to include the fishing mortality
- Possible applicable to yellowfin and bigeye
- SAC-13-08
- SAC-14 INF-E
- SAC-15 INF-G
- Comments
- Funding was secured from the EU for 2024