Eastern Baltic cod recruitment revisited—dynamics and impacting factors

Fritz Köster, Bastian Huwer, Hans-Harald Hinrichsen, Viola Neumann, Andrei Makarchouk, Margit Eero, Burkhard V. Dewitz, Karin Hüssy, Jonna Tomkiewicz, Piotr Margonski, Axel Temming, Jens-Peter Hermann, Daniel Oesterwind, Jan Dierking, Paul Kotterba, Maris Plikshs

Research output: Contribution to journalReviewResearchpeer-review

Abstract

The Eastern Baltic cod abundance started rapidly to increase in the mid-2000s as evidenced by analytical stock assessments, due to increased
recruitment and declining fishing mortality. Since 2014, the analytical stock assessment is not available, leaving the present stock status unclear and casting doubts about the magnitude of the recent increase in recruitment. Earlier studies identified main factors impacting on cod reproductive success to be related to the loss of two out of three spawning areas in the 1980s caused by lack of major Baltic inflows with a concurrent reduction in salinity and oxygen. Other important factors include prey availability for first-feeding larvae, egg predation by sprat and herring and cannibalism on juveniles, all in one way or the other related to the prevailing hydrographic conditions. These factors cannot explain increased reproductive success in the last decade, as the period was characterized by an absence of large-scale Baltic inflows since
2003 and persistent anoxic conditions in the bottom water of the deep Baltic basins. This questions the perception of the increased recruitment in later years and challenges our present understanding of cod recruitment dynamics in the Baltic Sea. In this contribution, we review evidence from the recent literature supplemented by information from latest research cruises to elucidate whether cod reproductive success indeed has increased during the last decade, and we suggest the key processes responsible for the recent dynamics in cod recruitment and outline directions for future research.
Original languageEnglish
JournalICES Journal of Marine Science
Volume74
Issue number1
Pages (from-to)3-19
ISSN1054-3139
DOIs
Publication statusPublished - 2017

Cite this

Köster, Fritz ; Huwer, Bastian ; Hinrichsen, Hans-Harald ; Neumann, Viola ; Makarchouk, Andrei ; Eero, Margit ; Dewitz, Burkhard V. ; Hüssy, Karin ; Tomkiewicz, Jonna ; Margonski, Piotr ; Temming, Axel ; Hermann, Jens-Peter ; Oesterwind, Daniel ; Dierking, Jan ; Kotterba, Paul ; Plikshs, Maris. / Eastern Baltic cod recruitment revisited—dynamics and impacting factors. In: ICES Journal of Marine Science. 2017 ; Vol. 74, No. 1. pp. 3-19.
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abstract = "The Eastern Baltic cod abundance started rapidly to increase in the mid-2000s as evidenced by analytical stock assessments, due to increased recruitment and declining fishing mortality. Since 2014, the analytical stock assessment is not available, leaving the present stock status unclear and casting doubts about the magnitude of the recent increase in recruitment. Earlier studies identified main factors impacting on cod reproductive success to be related to the loss of two out of three spawning areas in the 1980s caused by lack of major Baltic inflows with a concurrent reduction in salinity and oxygen. Other important factors include prey availability for first-feeding larvae, egg predation by sprat and herring and cannibalism on juveniles, all in one way or the other related to the prevailing hydrographic conditions. These factors cannot explain increased reproductive success in the last decade, as the period was characterized by an absence of large-scale Baltic inflows since2003 and persistent anoxic conditions in the bottom water of the deep Baltic basins. This questions the perception of the increased recruitment in later years and challenges our present understanding of cod recruitment dynamics in the Baltic Sea. In this contribution, we review evidence from the recent literature supplemented by information from latest research cruises to elucidate whether cod reproductive success indeed has increased during the last decade, and we suggest the key processes responsible for the recent dynamics in cod recruitment and outline directions for future research.",
author = "Fritz K{\"o}ster and Bastian Huwer and Hans-Harald Hinrichsen and Viola Neumann and Andrei Makarchouk and Margit Eero and Dewitz, {Burkhard V.} and Karin H{\"u}ssy and Jonna Tomkiewicz and Piotr Margonski and Axel Temming and Jens-Peter Hermann and Daniel Oesterwind and Jan Dierking and Paul Kotterba and Maris Plikshs",
year = "2017",
doi = "10.1093/icesjms/fsw172",
language = "English",
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Köster, F, Huwer, B, Hinrichsen, H-H, Neumann, V, Makarchouk, A, Eero, M, Dewitz, BV, Hüssy, K, Tomkiewicz, J, Margonski, P, Temming, A, Hermann, J-P, Oesterwind, D, Dierking, J, Kotterba, P & Plikshs, M 2017, 'Eastern Baltic cod recruitment revisited—dynamics and impacting factors', ICES Journal of Marine Science, vol. 74, no. 1, pp. 3-19. https://doi.org/10.1093/icesjms/fsw172

Eastern Baltic cod recruitment revisited—dynamics and impacting factors. / Köster, Fritz; Huwer, Bastian; Hinrichsen, Hans-Harald; Neumann, Viola; Makarchouk, Andrei; Eero, Margit; Dewitz, Burkhard V.; Hüssy, Karin; Tomkiewicz, Jonna; Margonski, Piotr; Temming, Axel; Hermann, Jens-Peter; Oesterwind, Daniel; Dierking, Jan; Kotterba, Paul; Plikshs, Maris.

In: ICES Journal of Marine Science, Vol. 74, No. 1, 2017, p. 3-19.

Research output: Contribution to journalReviewResearchpeer-review

TY - JOUR

T1 - Eastern Baltic cod recruitment revisited—dynamics and impacting factors

AU - Köster, Fritz

AU - Huwer, Bastian

AU - Hinrichsen, Hans-Harald

AU - Neumann, Viola

AU - Makarchouk, Andrei

AU - Eero, Margit

AU - Dewitz, Burkhard V.

AU - Hüssy, Karin

AU - Tomkiewicz, Jonna

AU - Margonski, Piotr

AU - Temming, Axel

AU - Hermann, Jens-Peter

AU - Oesterwind, Daniel

AU - Dierking, Jan

AU - Kotterba, Paul

AU - Plikshs, Maris

PY - 2017

Y1 - 2017

N2 - The Eastern Baltic cod abundance started rapidly to increase in the mid-2000s as evidenced by analytical stock assessments, due to increased recruitment and declining fishing mortality. Since 2014, the analytical stock assessment is not available, leaving the present stock status unclear and casting doubts about the magnitude of the recent increase in recruitment. Earlier studies identified main factors impacting on cod reproductive success to be related to the loss of two out of three spawning areas in the 1980s caused by lack of major Baltic inflows with a concurrent reduction in salinity and oxygen. Other important factors include prey availability for first-feeding larvae, egg predation by sprat and herring and cannibalism on juveniles, all in one way or the other related to the prevailing hydrographic conditions. These factors cannot explain increased reproductive success in the last decade, as the period was characterized by an absence of large-scale Baltic inflows since2003 and persistent anoxic conditions in the bottom water of the deep Baltic basins. This questions the perception of the increased recruitment in later years and challenges our present understanding of cod recruitment dynamics in the Baltic Sea. In this contribution, we review evidence from the recent literature supplemented by information from latest research cruises to elucidate whether cod reproductive success indeed has increased during the last decade, and we suggest the key processes responsible for the recent dynamics in cod recruitment and outline directions for future research.

AB - The Eastern Baltic cod abundance started rapidly to increase in the mid-2000s as evidenced by analytical stock assessments, due to increased recruitment and declining fishing mortality. Since 2014, the analytical stock assessment is not available, leaving the present stock status unclear and casting doubts about the magnitude of the recent increase in recruitment. Earlier studies identified main factors impacting on cod reproductive success to be related to the loss of two out of three spawning areas in the 1980s caused by lack of major Baltic inflows with a concurrent reduction in salinity and oxygen. Other important factors include prey availability for first-feeding larvae, egg predation by sprat and herring and cannibalism on juveniles, all in one way or the other related to the prevailing hydrographic conditions. These factors cannot explain increased reproductive success in the last decade, as the period was characterized by an absence of large-scale Baltic inflows since2003 and persistent anoxic conditions in the bottom water of the deep Baltic basins. This questions the perception of the increased recruitment in later years and challenges our present understanding of cod recruitment dynamics in the Baltic Sea. In this contribution, we review evidence from the recent literature supplemented by information from latest research cruises to elucidate whether cod reproductive success indeed has increased during the last decade, and we suggest the key processes responsible for the recent dynamics in cod recruitment and outline directions for future research.

U2 - 10.1093/icesjms/fsw172

DO - 10.1093/icesjms/fsw172

M3 - Review

VL - 74

SP - 3

EP - 19

JO - I C E S Journal of Marine Science

JF - I C E S Journal of Marine Science

SN - 1054-3139

IS - 1

ER -