Döring, Ralf

Prellezo, Raul

Ulrich, Clara

Vermard, Youen

Online Research Database In Technology

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Downloaded from orbit.dtu.dk on: Mar 30, 2019Mixed-fisheries management plans in Europe: Can we formulate asimplebioeconomicadvice on a complex reality?Examples from the North SeaUlrich, Clara; Döring, Ralf; Prellezo, Raul; Vermard, YouenPublication date:2018Document VersionPublisher's PDF, also known as Version of recordLink back to DTU OrbitCitation (APA):Ulrich, C., Döring, R., Prellezo, R., & Vermard, Y. (2018). Mixed-fisheries management plans in Europe: Can weformulate a simplebioeconomicadvice on a complex reality?Examples from the North Sea. Paper presented atIIFET 2018, Seattle, United States.Mixed-fisheries management plans in Europe: Can we formulate a simplebioeconomic advice on a complex reality?Examples from the North SeaClara UlrichRalf DöringRaul PrellezoYouen Vermard17/07/2018IIFET 20182 DTU Aqua, Technical University of DenmarkMSY in mixed-fisheries… Do we have a problem?F/Fmsy, North Sea stocksBiological interactionsTechnical interactions17/07/2018IIFET 20183 DTU Aqua, Technical University of DenmarkFurther complicated by EU policy constraintsRelative stability of historical TAC sharingChoke categories:Category 1: Sufficient quota at Member State level.Category 2: Insufficient quota at Member State level.Category 3: Insufficient quota at EU level.17/07/2018IIFET 20184 DTU Aqua, Technical University of Denmark     SustainableYield ”Pretty Good Yield” ! = 95% MSYFmsy FupperFlowerEU Mixed fisheries management plansThe plan also includeprovisions for • Bycatch stocks• Landing obligations• Techncial measures17/07/2018IIFET 20185 DTU Aqua, Technical University of DenmarkHow to provide scientific advice in thismultidimensional plan?MANAGERS’ SORT OF QUESTIONS…• How are the species linked with each others?• What are the risks of not achieving the management objectives for eachindividual stock, and what are the consequences if we don’t?• What are the choke species, and for who?• What are the economic incentives?• What is the impact at short and medium-term?SCIENTISTS’ SORT OF QUESTIONS• Which models and data are available? Are they compatible and consistent?• Which assumptions for which parameters?• Which scenarios to run?• Which results to present?17/07/2018IIFET 20186 DTU Aqua, Technical University of DenmarkStarting from single-stock advice for nextyear’s fish quotaSSBFisheries mortalityLandings(2017 advice)17/07/2018IIFET 20187 DTU Aqua, Technical University of DenmarkShort-term Mixed-fisheries advice (I): Risksof over/under-shootsMixed fisheries 2018:Most limiting (potential choke-species): • Haddock• WhitingLeast limiting:• Plaice• Saithe• Some Nephrops stocks17/07/2018IIFET 20188 DTU Aqua, Technical University of DenmarkShort-term Mixed-fisheries advice (II): Choke species by fleet(Subset)17/07/2018IIFET 20189 DTU Aqua, Technical University of DenmarkShort-term Mixed-fisheries advice (III): Minimising risks within Fmsy rangesLandingsSSB17/07/2018IIFET 201810 DTU Aqua, Technical University of DenmarkShort vs. medium-term bioeconomic impactanalyses (I)Higher TACs (Fupper) maintains the short term perspective (better results next year)But in the mid term there is a shift (due to the higher F’s)17/07/2018IIFET 201811 DTU Aqua, Technical University of DenmarkShort vs. medium-term bioeconomic impactanalyses (II)Projecting further (2023)perspective for society (GVA), capital (Net profit) and labour (Wages)17/07/2018IIFET 201812 DTU Aqua, Technical University of DenmarkShort vs. medium-term bioeconomic impactanalyses (III)Changes in likely choke species over time17/07/2018IIFET 201813 DTU Aqua, Technical University of DenmarkSummary• FROM ACADEMIA TO ADVICE…– Many bio-economic models available in academia, focusing on differentaspects of the same fisheries– Bioeconomic advice not standardised as biological advice– Not all models thus equally consistent, updated and timely– Challenge to define what is needed• MIXED-FISHERIES MSY AND MANAGEMENT PLANS– No unique best solution– Trade-offs between stocks and between short and medium-term– Choke species vary over years and fleets• WHAT’s NEXT?– 2018: test case – First year of implementation of the North Sea plan– Co-developement between managers and scientists17/07/2018IIFET 201814 DTU Aqua, Technical University of DenmarkAs simple as possible,As complicated as necessary

Mixed-fisheries management plans in Europe: Can we formulate a simplebioeconomicadvice on a complex reality?Examples from the North Sea

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Mixed-fisheries management plans in Europe: Can we formulate a simplebioeconomicadvice on a complex reality?Examples from the North Sea

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