Funded
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- Objectives
- Evaluate geographic variation in movements, behavior, and habitat utilization of yellowfin tuna via analyses of existing archival tag data sets from several discrete areas of the EPO
- Background
- Yellowfin exhibit restricted movements; tagged fish are normally recovered within about 1000 nm of point of release
- Future stock assessments of yellowfin should be spatially structured, because there are probably at least three stocks in the EPO
- Understanding movements, dispersion, and mixing between stocks, as well as behavior and habitat utilization, is essential for understanding population dynamics, estimating exploitation rates within stocks, and preventing localized depletions
- Relevance for management
- Spatially-structured stock assessments based on geographically-explicit life history parameters will provide a more accurate basis for the staff’s management advice
- Duration
- 12 months
- Workplan and status
- Several existing archival tag data sets from discrete areas of the EPO will be analyzed and compared to describe geographic variation in movements, behavior, and habitat utilization
- Historical conventional tag data sets for yellowfin from the EPO will also be included in the evaluations of movements and dispersion
- Deliverables
- Manuscript for publication in a scientific journal
- Updated date: 01 Mar 2021
- Progress summary for the reporting period
- A manuscript has been completed.
- Challenges and key lessons learnt
- Schaefer, K.M. and Fuller, D.W., 2022. Horizontal movements, utilization distributions, and mixing rates of yellowfin tuna (Thunnus albacares) tagged and released with archival tags in six discrete areas of the eastern and central Pacific Ocean. Fisheries Oceanography, 31(1), pp.84-107.