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Abstract

The ICES Working Group on Mixed Fisheries Methodology (WGMIXFISH-METHODS) met to progress work on the improvement and development of the mixed fisheries considerations.The work addressed in 2025 included improving workflows for the advice process, presenting methodological advances and responding to issues encountered during WGMIXFISH-ADVICE 2024. The group reviewed the annual data call and processing procedures and discussed improved communication of mixed fishery advice products and collaborations with other Working Groups.The primary development affecting data workflows is the planned introduction of the Regional DataBase and Estimation System (RDBES) to support stock assessments carried out in ICES. In 2027, RDBES will replace InterCatch and the current ad hoc mixed fisheries data call, providing WGMIXFISH with data at a greater level of disaggregation than is currently possible. Whereas this presents an opportunity to improve the quality of mixed fisheries analyses carried out by the Working Group, the transition to RDBES is challenging because new processes are needed to assemble the inputs to mixed fisheries models. The Working Group identified the data requirements and steps needed to transfer workflows to using RDBES and outlined a timetable for comparing inputs derived from RDBES and current workflows in 2026.Several methodological advances were presented, many of which address outstanding limitations of current approaches or stakeholder feedback received during mixed fisheries scoping workshops. These included improved modelling of joint harvesting in FLBEIA, an age-structured mixed fisheries model framework for the Celtic Sea case study, and analyses of métier effort-share and fleet quota-share assumptions to reduce fleet ‘choking’ behaviour through artificial and ‘weak’ technical interactions. Additionally, applications of externally developed mixed fisheries models for the Bay of Biscay and Central Mediterranean, and an analysis mixed fisheries in the Ionian Sea were presented.Finally, each case study addressed outcomes and issues encountered during the previous year in preparation for WGMIXFISH-ADVICE 2025.

Keywords

mixed fisheries; fishing fleets; fleet definition; harvest control rule

Published in

ICES scientific reports
2025, number: 7:86
Publisher: International Council for the Exploration of the Sea

SLU Authors

UKÄ Subject classification

Fish and Aquacultural Science

Publication identifier

  • DOI: https://doi.org/10.17895/ices.pub.29634626

Permanent link to this page (URI)

https://res.slu.se/id/publ/143321