Study to assess the robustness of mixed fisheries scenario assumptions: CINEA/EMFAF/2021/3.1.4 Lot 1 Specific Contract No. 13, CINEA/EMFAF/2021/3.1.4 Lot 2 Specific Contract No. 12: final report

Sarah Davie, Jasper Bleijenberg, Claire Moore, Klaas Sys, Dorleta Garcia, Thomas Brunel, Mikel Aristegui, Alessandro Orio, Els Torreele, Jochen Depestele, Josu Paradinas, Sonia Sanchez-Maroño, Valerio Bartolino, Vanessa Trijoulet, Richard Wakeford (Editor), F.J. Quirijns (Editor)

    Research output: Book/ReportReportAcademic

    Abstract

    This study tackles the challenges of providing advice for fishing EU demersal stocks when based solely on single-species data and Total Allowable Catches. Such advice neglects intricate multi-species interactions and could result in the over-exploitation of more vulnerable stocks. In this study, we explore ‘mixed fisheries’, a concept developed within ICES over the past decade. This looks at multi-species fisheries, where different species are caught together, to provide a more holistic approach to assessment, a step beyond single species considerations. To assess mixed-fisheries, scenario-based modelling is carried out considering different fishing regimes. However, the underlying assumptions of each scenario can lead to unrealistic recommendations, risking stock under-utilisation. The primary objective of this study was to analyse these assumptions and their impacts. Case studies in the North Sea, Celtic Sea and Bay of Biscay assess uncertainties and sensitivities of mixed-fisheries assessments used to guide European policy decisions on fishing and stock protection. This study addresses data source and resolution challenges, and shows that accurate fleet activity data are essential for identifying technical interactions. Examining fleet and métier definitions highlights the need to address overall model structural uncertainty, particularly in terms of fleet dynamics models. Characterising uncertainty in mixed-fisheries models sheds light on input parameter significance. Furthermore, this project introduces conceptual frameworks for scenario evaluation, stock rebuilding, adding new stocks and developing models for new areas within mixedfisheries models.
    Original languageEnglish
    Place of PublicationBrussels
    PublisherEuropean Commission
    Number of pages298
    ISBN (Electronic)9789294051080
    DOIs
    Publication statusPublished - Nov 2023

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