Achieving maximum sustainable yield in mixed fisheries: a management approach for the North Sea demersal fisheries

Other literature type, Article English OPEN
Ulrich, Clara ; Vermard, Youen ; Dolder, Paul J. ; Brunel, Thomas ; Jardim, Ernesto ; Holmes, Steven J. ; Kempf, Alexander ; Mortensen, Lars O. ; Poos, Jan-jaap ; Rindorf, Anna (2017)
  • Publisher: Oxford Univ Press
  • Journal: fsw126 (issn: 1054-3139, eissn: 1095-9289)
  • Related identifiers: doi: 10.1093/icesjms/fsw126
  • Subject: landing obligation | choke species | FMSY ranges | Common Fisheries Policy | management plan | pretty good yield | fleet modelling

Achieving single species maximum sustainable yield (MSY) in complex and dynamic fisheries targeting multiple species (mixed fisheries) is<br/>challenging because achieving the objective for one species may mean missing the objective for another. The North Sea mixed fisheries are a<br/>representative example of an issue that is generic across most demersal fisheries worldwide, with the diversity of species and fisheries inducing<br/>numerous biological and technical interactions. Building on a rich knowledge base for the understanding and quantification of these interactions,<br/>new approaches have emerged. Recent paths towards operationalizing MSY at the regional scale have suggested the expansion of the<br/>concept into a desirable area of “pretty good yield”, implemented through a range around FMSY that would allow for more flexibility in management<br/>targets. This article investigates the potential of FMSY ranges to combine long-term single-stock targets with flexible, short-term,<br/>mixed-fisheries management requirements applied to the main North Sea demersal stocks. It is shown that sustained fishing at the upper<br/>bound of the range may lead to unacceptable risks when technical interactions occur. An objective method is suggested that provides an optimal<br/>set of fishing mortality within the range, minimizing the risk of total allowable catch mismatches among stocks captured within mixed<br/>fisheries, and addressing explicitly the trade-offs between the most and least productive stocks.