Eastern Baltic cod in distress: biological changes and challenges for stock assessment

Margit Eero, Joakim Hjelm, Jane Behrens, Kurt Buckmann, Massimiliano Cardinale, Michele Casini, Pavel Gasyukov , Noel Holmgren, J. Horbowy, Karin Hüssy, Eskild Kirkegaard, G. Kornilovs, Uwe Krumme, Fritz Köster, Rainer Oeberst, M. Plikss, Krzysztof Radtke, Tiit Raid, Jörn O. Schmidt, Maciej TomczakMorten Vinther, Christopher Zimmermann, Marie Storr-Paulsen

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Abstract

The eastern Baltic (EB) cod (Gadus morhua) stock was depleted and overexploited for decades until the mid-2000s, when fishing mortality rapidly
declined and biomass started to increase, as shown by stock assessments. These positive developments were partly assigned to effective management
measures, and the EB cod was considered one of the most successful stock recoveries in recent times. In contrast to this optimistic view, the analytical stock assessment failed in 2014, leaving the present stock status unclear. Deteriorated quality of some basic input data for stock assessment in combination with changes in environmental and ecological conditions has led to an unusual situation for cod in the Baltic Sea, which poses new challenges for stock assessment and management advice.Anumber of adverse developments such as low nutritional condition and disappearance of larger individuals indicate that the stock is in distress. In this study, we (i) summarize the knowledge of recent changes in cod biology and ecosystem conditions, (ii) describe the subsequent challenges for stock assessment, and (iii) highlight the key questions where answers are urgently needed to understand the present stock status and provide scientifically solid support for cod management in the Baltic Sea
Original languageEnglish
JournalICES Journal of Marine Science
Volume72
Issue number8
Pages (from-to)2180-2186
ISSN1054-3139
DOIs
Publication statusPublished - 2015

Cite this

Eero, Margit ; Hjelm, Joakim ; Behrens, Jane ; Buckmann, Kurt ; Cardinale, Massimiliano ; Casini, Michele ; Gasyukov , Pavel ; Holmgren, Noel ; Horbowy, J. ; Hüssy, Karin ; Kirkegaard, Eskild ; Kornilovs, G. ; Krumme, Uwe ; Köster, Fritz ; Oeberst, Rainer ; Plikss, M. ; Radtke, Krzysztof ; Raid, Tiit ; Schmidt, Jörn O. ; Tomczak, Maciej ; Vinther, Morten ; Zimmermann, Christopher ; Storr-Paulsen, Marie. / Eastern Baltic cod in distress: biological changes and challenges for stock assessment. In: ICES Journal of Marine Science. 2015 ; Vol. 72, No. 8. pp. 2180-2186.
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title = "Eastern Baltic cod in distress: biological changes and challenges for stock assessment",
abstract = "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, the analytical stock assessment failed in 2014, leaving the present stock status unclear. Deteriorated quality of some basic input data for stock assessment in combination with changes in environmental and ecological conditions has led to an unusual situation for cod in the Baltic Sea, which poses new challenges for stock assessment and management advice.Anumber of adverse developments such as low nutritional condition and disappearance of larger individuals indicate that the stock is in distress. In this study, we (i) summarize the knowledge of recent changes in cod biology and ecosystem conditions, (ii) describe the subsequent challenges for stock assessment, and (iii) highlight the key questions where answers are urgently needed to understand the present stock status and provide scientifically solid support for cod management in the Baltic Sea",
author = "Margit Eero and Joakim Hjelm and Jane Behrens and Kurt Buckmann and Massimiliano Cardinale and Michele Casini and Pavel Gasyukov and Noel Holmgren and J. Horbowy and Karin H{\"u}ssy and Eskild Kirkegaard and G. Kornilovs and Uwe Krumme and Fritz K{\"o}ster and Rainer Oeberst and M. Plikss and Krzysztof Radtke and Tiit Raid and Schmidt, {J{\"o}rn O.} and Maciej Tomczak and Morten Vinther and Christopher Zimmermann and Marie Storr-Paulsen",
year = "2015",
doi = "10.1093/icesjms/fsv109",
language = "English",
volume = "72",
pages = "2180--2186",
journal = "I C E S Journal of Marine Science",
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Eero, M, Hjelm, J, Behrens, J, Buckmann, K, Cardinale, M, Casini, M, Gasyukov , P, Holmgren, N, Horbowy, J, Hüssy, K, Kirkegaard, E, Kornilovs, G, Krumme, U, Köster, F, Oeberst, R, Plikss, M, Radtke, K, Raid, T, Schmidt, JO, Tomczak, M, Vinther, M, Zimmermann, C & Storr-Paulsen, M 2015, 'Eastern Baltic cod in distress: biological changes and challenges for stock assessment', ICES Journal of Marine Science, vol. 72, no. 8, pp. 2180-2186. https://doi.org/10.1093/icesjms/fsv109

Eastern Baltic cod in distress: biological changes and challenges for stock assessment. / Eero, Margit; Hjelm, Joakim; Behrens, Jane; Buckmann, Kurt; Cardinale, Massimiliano; Casini, Michele; Gasyukov , Pavel; Holmgren, Noel; Horbowy, J.; Hüssy, Karin; Kirkegaard, Eskild; Kornilovs, G.; Krumme, Uwe; Köster, Fritz; Oeberst, Rainer; Plikss, M.; Radtke, Krzysztof; Raid, Tiit; Schmidt, Jörn O.; Tomczak, Maciej; Vinther, Morten; Zimmermann, Christopher; Storr-Paulsen, Marie.

In: ICES Journal of Marine Science, Vol. 72, No. 8, 2015, p. 2180-2186.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Eastern Baltic cod in distress: biological changes and challenges for stock assessment

AU - Eero, Margit

AU - Hjelm, Joakim

AU - Behrens, Jane

AU - Buckmann, Kurt

AU - Cardinale, Massimiliano

AU - Casini, Michele

AU - Gasyukov , Pavel

AU - Holmgren, Noel

AU - Horbowy, J.

AU - Hüssy, Karin

AU - Kirkegaard, Eskild

AU - Kornilovs, G.

AU - Krumme, Uwe

AU - Köster, Fritz

AU - Oeberst, Rainer

AU - Plikss, M.

AU - Radtke, Krzysztof

AU - Raid, Tiit

AU - Schmidt, Jörn O.

AU - Tomczak, Maciej

AU - Vinther, Morten

AU - Zimmermann, Christopher

AU - Storr-Paulsen, Marie

PY - 2015

Y1 - 2015

N2 - 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, the analytical stock assessment failed in 2014, leaving the present stock status unclear. Deteriorated quality of some basic input data for stock assessment in combination with changes in environmental and ecological conditions has led to an unusual situation for cod in the Baltic Sea, which poses new challenges for stock assessment and management advice.Anumber of adverse developments such as low nutritional condition and disappearance of larger individuals indicate that the stock is in distress. In this study, we (i) summarize the knowledge of recent changes in cod biology and ecosystem conditions, (ii) describe the subsequent challenges for stock assessment, and (iii) highlight the key questions where answers are urgently needed to understand the present stock status and provide scientifically solid support for cod management in the Baltic Sea

AB - 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, the analytical stock assessment failed in 2014, leaving the present stock status unclear. Deteriorated quality of some basic input data for stock assessment in combination with changes in environmental and ecological conditions has led to an unusual situation for cod in the Baltic Sea, which poses new challenges for stock assessment and management advice.Anumber of adverse developments such as low nutritional condition and disappearance of larger individuals indicate that the stock is in distress. In this study, we (i) summarize the knowledge of recent changes in cod biology and ecosystem conditions, (ii) describe the subsequent challenges for stock assessment, and (iii) highlight the key questions where answers are urgently needed to understand the present stock status and provide scientifically solid support for cod management in the Baltic Sea

U2 - 10.1093/icesjms/fsv109

DO - 10.1093/icesjms/fsv109

M3 - Journal article

VL - 72

SP - 2180

EP - 2186

JO - I C E S Journal of Marine Science

JF - I C E S Journal of Marine Science

SN - 1054-3139

IS - 8

ER -