Working Group on Mixed Fisheries Advice Methodology (WGMIXFISH-METHODS)

Gianfranco Anastasi; Johnathan Ball; Isabella Bitetto; Thomas Brunel; Santiago  Cerviño; Chun Chen; Harriet  Cole; Marta Cousido; Paul Dolder; Marta Ferraro; Dorleta Garcia; Bernhard Kühn; Luca Lamoni; Claire Macher; Hugo Mendes; Mathieu Merzéréaud; Sarah Millar; Claire Moore; Alessandro Orio; Matthew Pace; Lionel Pawlowski; Sonia Sánchez-Maroño; Klaas Sys; Marc Taylor; Vanessa Trijoulet; Evangelos Tzanatos; Youen Vermard

doi:10.17895/ices.pub.29634626

Working Group on Mixed Fisheries Advice Methodology (WGMIXFISH-METHODS)

Gianfranco Anastasi
, Johnathan Ball
, Isabella Bitetto
, Thomas Brunel
, Santiago Cerviño
, Chun Chen
, Harriet Cole
, Marta Cousido
, Paul Dolder
, Marta Ferraro
, Dorleta Garcia
, Bernhard Kühn
, Luca Lamoni
, Claire Macher
, Hugo Mendes
, Mathieu Merzéréaud
, Sarah Millar
, Claire Moore
, Alessandro Orio
, Matthew Pace

Lionel Pawlowski, Sonia Sánchez-Maroño, Klaas Sys, Marc Taylor, Vanessa Trijoulet, Evangelos Tzanatos, Youen Vermard

Centre for the Environment Fisheries and Aquaculture Science
Coispa Tecnologia & Ricerca Scarl
Wageningen University & Research
Instituto Espanol de Oceanografia
Marine Directorate of the Scottish Government
Marine Institute
AZTI
Johann Heinrich von Thunen Institute
International Council for the Exploration of the Sea
Institut français de recherche pour l'exploitation de la mer
The Portuguese Institute for Sea and Atmosphere
Swedish University of Agricultural Sciences
Research Institute for Agriculture and Fisheries
University of Patras

Research output: Book/Report › Report › Commissioned

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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.

Original language	English

Place of Publication	Copenhagen, Denmark
Publisher	International Council for the Exploration of the Sea (ICES)
Number of pages	57
DOIs	https://doi.org/10.17895/ices.pub.29634626
Publication status	Published - 2025

Series	ICES Scientific Report
Number	86
Volume	7
ISSN	2618-1371

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 14 Life Below Water

Keywords

Mixed fisheries
Fishing fleets
Fleet definition
Harvest control rule

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Anastasi, G., Ball, J., Bitetto, I., Brunel, T., Cerviño, S., Chen, C., Cole, H., Cousido, M., Dolder, P., Ferraro, M., Garcia, D., Kühn, B., Lamoni, L., Macher, C., Mendes, H., Merzéréaud, M., Millar, S., Moore, C., Orio, A., ... Vermard, Y. (2025). Working Group on Mixed Fisheries Advice Methodology (WGMIXFISH-METHODS). International Council for the Exploration of the Sea (ICES). ICES Scientific Report Vol. 7 No. 86 https://doi.org/10.17895/ices.pub.29634626

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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 m{\'e}tier effort-share and fleet quota-share assumptions to reduce fleet {\textquoteleft}choking{\textquoteright} behaviour through artificial and {\textquoteleft}weak{\textquoteright} 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.",

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doi = "10.17895/ices.pub.29634626",

language = "English",

series = "ICES Scientific Report",

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Anastasi, G, Ball, J, Bitetto, I, Brunel, T, Cerviño, S, Chen, C, Cole, H, Cousido, M, Dolder, P, Ferraro, M, Garcia, D, Kühn, B, Lamoni, L, Macher, C, Mendes, H, Merzéréaud, M, Millar, S, Moore, C, Orio, A, Pace, M, Pawlowski, L, Sánchez-Maroño, S, Sys, K, Taylor, M, Trijoulet, V, Tzanatos, E & Vermard, Y 2025, Working Group on Mixed Fisheries Advice Methodology (WGMIXFISH-METHODS). ICES Scientific Report, no. 86, vol. 7, International Council for the Exploration of the Sea (ICES), Copenhagen, Denmark. https://doi.org/10.17895/ices.pub.29634626

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T1 - Working Group on Mixed Fisheries Advice Methodology (WGMIXFISH-METHODS)

AU - Anastasi, Gianfranco

AU - Ball, Johnathan

AU - Bitetto, Isabella

AU - Brunel, Thomas

AU - Cerviño, Santiago

AU - Chen, Chun

AU - Cole, Harriet

AU - Cousido, Marta

AU - Dolder, Paul

AU - Ferraro, Marta

AU - Garcia, Dorleta

AU - Kühn, Bernhard

AU - Lamoni, Luca

AU - Macher, Claire

AU - Mendes, Hugo

AU - Merzéréaud, Mathieu

AU - Millar, Sarah

AU - Moore, Claire

AU - Orio, Alessandro

AU - Pace, Matthew

AU - Pawlowski, Lionel

AU - Sánchez-Maroño, Sonia

AU - Sys, Klaas

AU - Taylor, Marc

AU - Trijoulet, Vanessa

AU - Tzanatos, Evangelos

AU - Vermard, Youen

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N2 - 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.

AB - 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.

KW - Mixed fisheries

KW - Fishing fleets

KW - Fleet definition

KW - Harvest control rule

U2 - 10.17895/ices.pub.29634626

DO - 10.17895/ices.pub.29634626

M3 - Report

T3 - ICES Scientific Report

BT - Working Group on Mixed Fisheries Advice Methodology (WGMIXFISH-METHODS)

PB - International Council for the Exploration of the Sea (ICES)

CY - Copenhagen, Denmark

ER -

Working Group on Mixed Fisheries Advice Methodology (WGMIXFISH-METHODS)

Abstract

UN SDGs

Keywords

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