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MSY-orientated management of Baltic Sea herring (Clupea harengus) during different ecosystem regimes
University of Skövde, School of Life Sciences. University of Skövde, The Systems Biology Research Centre.ORCID iD: 0000-0003-3000-8786
University of Skövde, School of Life Sciences. University of Skövde, The Systems Biology Research Centre.ORCID iD: 0000-0002-2055-4284
University of Tartu, Estonian Marine Institute, Tallin, Estonia.
Fisheries and Environmental Management Group, Department of Environmental Sciences, University of Helsinki, Finland.
2012 (English)In: ICES Journal of Marine Science, ISSN 1054-3139, E-ISSN 1095-9289, Vol. 69, no 2, 257-266 p.Article in journal (Refereed) Published
Abstract [en]

The Baltic Sea ecosystem has undergone dramatic changes, so-called ecosystem regime shifts, during the past four decades. Baltic Sea herring (Clupea harengus) spawning-stock biomass has declined to a third, and weight-at-age has halved as a result of food shortages and competition with sprat (Sprattus sprattus). The management objective for the herring stock is currently in transition from precautionary to maximum sustainable yield (MSY). The main basin Baltic Sea herring was modelled under the current ecosystem regime and the effect of a recovery of the cod (Gadus morhua) stock and the availability of planktonic food to levels found in the early 1980s analysed. A target of F-MSY = 0.16 for herring, which should decline to F-MSY = 0.10 with recovery of the cod stock, is proposed. An increase in the availability of planktonic food is estimated to more than double the yield at F-MSY = 0.27, overriding the negative effects of cod predation should there be a simultaneous increase in both cod and availability of planktonic food. The estimated net increase in yield is 40% at F-MSY = 0.20. Functions are presented to calculate FMSY and to estimate the expected yield depending on the abundance of cod and food availability. Retrospective application of the functions is indicative of overfishing of herring in the 1990s and early 2000s, and a net loss in yield, with a landing value of some E440 million.

Place, publisher, year, edition, pages
Oxford University Press, 2012. Vol. 69, no 2, 257-266 p.
Keyword [en]
density-dependence, fishing mortality, productivity, sustainability, weight-at-age, yield
National Category
Natural Sciences Fish and Aquacultural Science
Research subject
Natural sciences; Natural sciences
Identifiers
URN: urn:nbn:se:his:diva-5667DOI: 10.1093/icesjms/fsr202ISI: 000300491200013Scopus ID: 2-s2.0-84857269747OAI: oai:DiVA.org:his-5667DiVA: diva2:513340
Available from: 2012-04-02 Created: 2012-04-02 Last updated: 2015-09-02Bibliographically approved

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