Two- and three-dimensional maturation reaction norms for the eastern Baltic cod, Gadus morhua
<qd> Vainikka, A., Gårdmark, A., Bland, B., and Hjelm, J. 2009. Two- and three-dimensional maturation reaction norms for the eastern Baltic cod, Gadus morhua . – ICES Journal of Marine Science, 66: 000–000. </qd>Industrial fisheries have caused decreases in the size and age at maturation...
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fthighwire:oai:open-archive.highwire.org:icesjms:fsn199v1 2023-05-15T16:18:57+02:00 Two- and three-dimensional maturation reaction norms for the eastern Baltic cod, Gadus morhua Vainikka, Anssi Gårdmark, Anna Bland, Barbara Hjelm, Joakim 2008-12-02 05:38:54.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/fsn199v1 https://doi.org/10.1093/icesjms/fsn199 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/fsn199v1 http://dx.doi.org/10.1093/icesjms/fsn199 Copyright (C) 2008, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Article TEXT 2008 fthighwire https://doi.org/10.1093/icesjms/fsn199 2013-05-26T22:26:46Z <qd> Vainikka, A., Gårdmark, A., Bland, B., and Hjelm, J. 2009. Two- and three-dimensional maturation reaction norms for the eastern Baltic cod, Gadus morhua . – ICES Journal of Marine Science, 66: 000–000. </qd>Industrial fisheries have caused decreases in the size and age at maturation in several stocks of cod ( Gadus morhua ). Although earlier maturation can be a phenotypic response to improved growth conditions, estimation of probabilistic maturation reaction norms (PMRNs) can remove most impacts of growth and demography from maturation schedules and has often revealed a residual, potentially genetic, trend. In this study, size- and condition-based PMRNs were estimated for eastern Baltic cod cohorts from 1987 to 2003. The PMRNs suggested that both length and condition at 50% probability of maturing (Lp 50 and Cp 50 ) had decreased by 15–20%, more notably in females. Simultaneously with changes in maturation schedules, the length-at-age of mature fish decreased for most combinations of age and sex. Decrease in growth may be partly explained by advanced maturation, but temporal fluctuations in PMRNs suggest also a residual environmental impact on both growth and maturation. The results may indicate a genetic change in the eastern Baltic cod stock, adding pressure to reduce fishing mortality on it. Text Gadus morhua HighWire Press (Stanford University) ICES Journal of Marine Science 66 2 248 257 |
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Article Vainikka, Anssi Gårdmark, Anna Bland, Barbara Hjelm, Joakim Two- and three-dimensional maturation reaction norms for the eastern Baltic cod, Gadus morhua |
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<qd> Vainikka, A., Gårdmark, A., Bland, B., and Hjelm, J. 2009. Two- and three-dimensional maturation reaction norms for the eastern Baltic cod, Gadus morhua . – ICES Journal of Marine Science, 66: 000–000. </qd>Industrial fisheries have caused decreases in the size and age at maturation in several stocks of cod ( Gadus morhua ). Although earlier maturation can be a phenotypic response to improved growth conditions, estimation of probabilistic maturation reaction norms (PMRNs) can remove most impacts of growth and demography from maturation schedules and has often revealed a residual, potentially genetic, trend. In this study, size- and condition-based PMRNs were estimated for eastern Baltic cod cohorts from 1987 to 2003. The PMRNs suggested that both length and condition at 50% probability of maturing (Lp 50 and Cp 50 ) had decreased by 15–20%, more notably in females. Simultaneously with changes in maturation schedules, the length-at-age of mature fish decreased for most combinations of age and sex. Decrease in growth may be partly explained by advanced maturation, but temporal fluctuations in PMRNs suggest also a residual environmental impact on both growth and maturation. The results may indicate a genetic change in the eastern Baltic cod stock, adding pressure to reduce fishing mortality on it. |
format |
Text |
author |
Vainikka, Anssi Gårdmark, Anna Bland, Barbara Hjelm, Joakim |
author_facet |
Vainikka, Anssi Gårdmark, Anna Bland, Barbara Hjelm, Joakim |
author_sort |
Vainikka, Anssi |
title |
Two- and three-dimensional maturation reaction norms for the eastern Baltic cod, Gadus morhua |
title_short |
Two- and three-dimensional maturation reaction norms for the eastern Baltic cod, Gadus morhua |
title_full |
Two- and three-dimensional maturation reaction norms for the eastern Baltic cod, Gadus morhua |
title_fullStr |
Two- and three-dimensional maturation reaction norms for the eastern Baltic cod, Gadus morhua |
title_full_unstemmed |
Two- and three-dimensional maturation reaction norms for the eastern Baltic cod, Gadus morhua |
title_sort |
two- and three-dimensional maturation reaction norms for the eastern baltic cod, gadus morhua |
publisher |
Oxford University Press |
publishDate |
2008 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/fsn199v1 https://doi.org/10.1093/icesjms/fsn199 |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/fsn199v1 http://dx.doi.org/10.1093/icesjms/fsn199 |
op_rights |
Copyright (C) 2008, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1093/icesjms/fsn199 |
container_title |
ICES Journal of Marine Science |
container_volume |
66 |
container_issue |
2 |
container_start_page |
248 |
op_container_end_page |
257 |
_version_ |
1766005232119054336 |