Funded
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- Objectives
- Reduce bycatches of small yellowfin in purse-seine sets.
- Background
- The International Seafood Sustainability Foundation (ISSF) has been supporting investigations of acoustic methods for discrimination among tuna species caught in purse-seine sets
- Acoustic technologies could provide the ability to discriminate and avoid undersized yellowfin tuna by the purse-seine fishery to reduce the impacts of fishing operations and improve the sustainability of the fishery.
- To discriminate yellowfin from skipjack and bigeye, it is necessary to know the acoustic properties of yellowfin, in particular, the target strength (TS) and TS-fish length relationship.
- Acoustic studies will be conducted on juvenile yellowfin (1-yr-old) held in a previously-deployed sea cage at the Achotines Laboratory
- The fundamental acoustic information obtained for yellowfin will then be compared to information previously obtained for skipjack and bigeye, hopefully enabling fishers to discriminate species before fishing
- Relevance for management
- Reduce the impacts of fishing and improve the sustainability of the fishery
- Duration
- 36 months
- Workplan and status
- Early 2020 purchase materials used to anchor and deploy sea cage
- January-April 2022 install sea cage and collect juvenile yellowfin in waters adjacent to the Achotines Laboratory
- June 2021-April 2022 staging of ISSF acoustic equipment at Achotines Laboratory
- May-June 2022 conduct acoustic trial
- Late 2022 draft report of study results completed by ISSF researchers
- Late 2022 workshop organized to present the results and discuss them with scientists and buoy manufacturers
- External collaborators
- International Seafood Sustainability Foundation (ISSF) researchers Drs. Gala Moreno and Guillermo Boyra
- Deliverables
- Study report developed by ISSF researchers and workshop organized by ISSF
- Publication of results by ISSF researchers in peer-reviewed journal