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Eastern Baltic cod in distress: biological changes and challenges for stock assessment
National Institute of Aquatic Resources, Technical University of Denmark, Charlottenlund, Denmark.
Department of Aquatic Resources, Institute of Marine Research, Swedish University of Agricultural Sciences, Lysekil, Sweden.
National Institute of Aquatic Resources, Technical University of Denmark, Charlottenlund, Denmark.
Department of Veterinary Disease Biology, University of Copenhagen, Copenhagen, Denmark.
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2015 (Engelska)Ingår i: ICES Journal of Marine Science, ISSN 1054-3139, E-ISSN 1095-9289, Vol. 72, nr 8, s. 2180-2186Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The eastern Baltic (EB) cod (Gadus morhua) stock was depleted and overexploited for decades until the mid-2000s, when fishing mortality rapidlydeclined and biomass started to increase, as shown by stock assessments. These positive developments were partly assigned to effective managementmeasures, and the EB cod was considered one of the most successful stock recoveries in recent times. In contrast to this optimistic view, theanalytical stock assessment failed in 2014, leaving the present stock status unclear. Deteriorated quality of some basic input data for stock assessmentin combination with changes in environmental and ecological conditions has led to an unusual situation for cod in the Baltic Sea, which posesnew challenges for stock assessment and management advice.Anumber of adverse developments such as low nutritional condition and disappearanceof larger individuals indicate that the stock is in distress. In this study, we (i) summarize the knowledge of recent changes in cod biology andecosystem conditions, (ii) describe the subsequent challenges for stock assessment, and (iii) highlight the key questions where answers are urgentlyneeded to understand the present stock status and provide scientifically solid support for cod management in the Baltic Sea.

Ort, förlag, år, upplaga, sidor
Oxford University Press, 2015. Vol. 72, nr 8, s. 2180-2186
Nyckelord [en]
data quality, eastern Baltic cod, ecosystem understanding, stock assessment
Nationell ämneskategori
Fisk- och akvakulturforskning
Forskningsämne
Ekologisk modellering
Identifikatorer
URN: urn:nbn:se:his:diva-11054DOI: 10.1093/icesjms/fsv109ISI: 000368251600002Scopus ID: 2-s2.0-84946610698OAI: oai:DiVA.org:his-11054DiVA, id: diva2:819870
Tillgänglig från: 2015-06-11 Skapad: 2015-06-11 Senast uppdaterad: 2019-01-30Bibliografiskt granskad

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