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Estimating MSY and MEY in multi-species and multi-fleet fisheries, consequences and limits: an application to the Bay of Biscay mixed fishery

Author

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  • Guillen, Jordi
  • Macher, Claire
  • Merzéréaud, Mathieu
  • Bertignac, Michel
  • Fifas, Spyros
  • Guyader, Olivier

Abstract

Most worldwide fish stocks are overexploited, and so exploited beyond the Maximum Sustainable Yield (MSY) and the Maximum Economic Yield (MEY). Not exploiting fisheries resources at MSY or MEY leads to the loss of production and rents from the fisheries. A large part of the EU fisheries are managed based on single species stock assessments; however, in reality, most species are caught together with other species and by different fleets. In multi-species and multi-fleet fisheries, single species assessments, and consequently MSY and MEY reference points, are often not valid, and so the catch recommendations. In this paper it is investigated the MSY and MEY estimation in multi-species and multi-fleet fisheries in comparison to single species assessments. Analyses are applied to the Bay of Biscay demersal fishery using the IAM bio-economic model. The impact of exploiting at MSY and MEY on the optimal effort allocation between fleets with different exploitation patterns and economic structures is analyzed. When accounting for the multi-species nature of the fishery, MSY landings are 0.4% to 2.7% lower than the single species simulations estimates. When accounting for the multi-fleet nature of the fishery, MSY landings are 27.2% to 30.2% higher than the single-fleet estimates. When considering the multi-fleet characteristics, MEY landings are 6.6% higher and profits are 66.5% higher than in the single-fleet simulation. Optimal effort at MEY is lower than at MSY, but when accounting for multi-fleet the optimal effort decreases for some fleets while increases for gillnetters. The results also provide an estimation of the profits at MEY (or costs of not being at MEY). Profits can be then up to 10.7 times larger than the current profits (256 million Euros compared to the current 24 million Euros).

Suggested Citation

  • Guillen, Jordi & Macher, Claire & Merzéréaud, Mathieu & Bertignac, Michel & Fifas, Spyros & Guyader, Olivier, 2013. "Estimating MSY and MEY in multi-species and multi-fleet fisheries, consequences and limits: an application to the Bay of Biscay mixed fishery," Marine Policy, Elsevier, vol. 40(C), pages 64-74.
    • Handle: RePEc:eee:marpol:v:40:y:2013:i:c:p:64-74
    DOI: 10.1016/j.marpol.2012.12.029
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    Citations

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    Cited by:

    1. Helene Gomes & Luc Doyen & Fabian Blanchard & Adrien Lagarde, 2021. "Viable and ecosystem-based management for tropical small-scale fisheries facing climate change," Bordeaux Economics Working Papers 2021-24, Bordeaux School of Economics (BSE).
    2. Segura, Juan & Hilker, Frank M. & Franco, Daniel, 2019. "Enhancing population stability with combined adaptive limiter control and finding the optimal harvesting–restocking balance," Theoretical Population Biology, Elsevier, vol. 130(C), pages 1-12.
    3. Eric TROMEUR & Luc DOYEN, 2016. "Optimal biodiversity erosion in multispecies fisheries," Cahiers du GREThA (2007-2019) 2016-20, Groupe de Recherche en Economie Théorique et Appliquée (GREThA).
    4. Lagarde, A. & Doyen, L. & Ahad-Cissé, A. & Caill-Milly, N. & Gourguet, S. & Pape, O. Le & Macher, C. & Morandeau, G. & Thébaud, O., 2018. "How Does MMEY Mitigate the Bioeconomic Effects of Climate Change for Mixed Fisheries," Ecological Economics, Elsevier, vol. 154(C), pages 317-332.
    5. Tromeur, Eric & Doyen, Luc & Tarizzo, Violaine & Little, L. Richard & Jennings, Sarah & Thébaud, Olivier, 2021. "Risk averse policies foster bio-economic sustainability in mixed fisheries," Ecological Economics, Elsevier, vol. 190(C).
    6. Guillen, Jordi & Maynou, Francesc, 2014. "Importance of temporal and spatial factors in the ex-vessel price formation for red shrimp and management implications," Marine Policy, Elsevier, vol. 47(C), pages 66-70.
    7. Adrien Lagarde & Abdoul Ahad-Cissé & Sophie Gourguet & Olivier Le Pape & Olivier Thébaud & Nathalie Caill-Milly & Gilles Morandeau & Claire Macher & Luc Doyen, 2017. "How MMEY mitigates bio-economic impacts of climate change on mixed fisheries," Cahiers du GREThA (2007-2019) 2017-22, Groupe de Recherche en Economie Théorique et Appliquée (GREThA).
    8. Violaine Tarizzo & Eric Tromeur & Olivier Thébaud & Richard Little & Sarah Jennings & Luc Doyen, 2018. "Risk averse policies foster bio-economic sustainability in mixed fisheries," Cahiers du GREThA (2007-2019) 2018-07, Groupe de Recherche en Economie Théorique et Appliquée (GREThA).
    9. Dowling, Natalie A. & Dichmont, Catherine M. & Leigh, George M. & Pascoe, Sean & Pears, Rachel J. & Roberts, Tom & Breen, Sian & Cannard, Toni & Mamula, Aaron & Mangel, Marc, 2020. "Optimising harvest strategies over multiple objectives and stakeholder preferences," Ecological Modelling, Elsevier, vol. 435(C).
    10. Mark T. Gibbs, 2016. "Applying the concept of State of Good Repair to the management of ecological infrastructure," Journal of Environmental Planning and Management, Taylor & Francis Journals, vol. 59(6), pages 1091-1106, June.
    11. Jordi Guillen & Steven J. Holmes & Natacha Carvalho & John Casey & Hendrik Dörner & Maurizio Gibin & Alessandro Mannini & Paraskevas Vasilakopoulos & Antonella Zanzi, 2018. "A Review of the European Union Landing Obligation Focusing on Its Implications for Fisheries and the Environment," Sustainability, MDPI, vol. 10(4), pages 1-12, March.

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