Evaluation of otolith shape analysis as a tool for discriminating adults of Baltic cod stocks
The two stocks of cod (Gadus morhua L.) in the Baltic Sea are separated by two main spawning areas and main spawning periods. Migrations of juveniles and adults result in the mixing of both stocks. At present, the two stocks have been discriminated using inter alia meristics and morphometry, genetic...
Published in: | Journal of Applied Ichthyology |
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ftopenagrar:oai:www.openagrar.de:timport_mods_00018107 2023-05-15T15:27:34+02:00 Evaluation of otolith shape analysis as a tool for discriminating adults of Baltic cod stocks Paul, Katrin Oeberst, Rainer Hammer, Cornelius 2013 7 https://doi.org/10.1111/jai.12145 https://www.openagrar.de/receive/timport_mods_00018107 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00018107/dn052084.pdf eng eng Journal of applied ichthyology -- Zeitschrift für angewandte Ichthyologie -- J Appl Ichthyol; Z Angew Ichthyol -- 0175-8659 -- 1439-0426 -- 283875-8 -- 2020412-7 -- http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1439-0426 https://doi.org/10.1111/jai.12145 https://www.openagrar.de/receive/timport_mods_00018107 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00018107/dn052084.pdf only signed in user info:eu-repo/semantics/openAccess Text article Text 2013 ftopenagrar https://doi.org/10.1111/jai.12145 2023-03-06T00:07:20Z The two stocks of cod (Gadus morhua L.) in the Baltic Sea are separated by two main spawning areas and main spawning periods. Migrations of juveniles and adults result in the mixing of both stocks. At present, the two stocks have been discriminated using inter alia meristics and morphometry, genetics and tagging experiments. However, using these techniques it is not possible to assign single, non-spawning individuals to a certain stock. Since otolith shape analysis has become a common method for stock discrimination and has been applied successfully to several Atlantic cod stocks, it was applied here for the Baltic cod stocks. To obtain baseline samples, spawning cod were sampled between 2005 and 2009 in the main spawning areas during the spawning periods. The otolith contours were digitized and elliptical Fourier descriptors were analyzed. Both stocks differed significantly in their otolith shapes, and individuals could be allocated with >90% accuracy to one of the stocks. Both Baltic cod stocks and cod from West Greenland were discriminated with 93% correct classification. These results highlight otolith shape analysis as a useful tool to discriminate adults of Baltic cod stocks. Article in Journal/Newspaper atlantic cod Gadus morhua Greenland OpenAgrar (OA) Greenland Journal of Applied Ichthyology 29 4 743 750 |
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English |
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Text Paul, Katrin Oeberst, Rainer Hammer, Cornelius Evaluation of otolith shape analysis as a tool for discriminating adults of Baltic cod stocks |
topic_facet |
Text |
description |
The two stocks of cod (Gadus morhua L.) in the Baltic Sea are separated by two main spawning areas and main spawning periods. Migrations of juveniles and adults result in the mixing of both stocks. At present, the two stocks have been discriminated using inter alia meristics and morphometry, genetics and tagging experiments. However, using these techniques it is not possible to assign single, non-spawning individuals to a certain stock. Since otolith shape analysis has become a common method for stock discrimination and has been applied successfully to several Atlantic cod stocks, it was applied here for the Baltic cod stocks. To obtain baseline samples, spawning cod were sampled between 2005 and 2009 in the main spawning areas during the spawning periods. The otolith contours were digitized and elliptical Fourier descriptors were analyzed. Both stocks differed significantly in their otolith shapes, and individuals could be allocated with >90% accuracy to one of the stocks. Both Baltic cod stocks and cod from West Greenland were discriminated with 93% correct classification. These results highlight otolith shape analysis as a useful tool to discriminate adults of Baltic cod stocks. |
format |
Article in Journal/Newspaper |
author |
Paul, Katrin Oeberst, Rainer Hammer, Cornelius |
author_facet |
Paul, Katrin Oeberst, Rainer Hammer, Cornelius |
author_sort |
Paul, Katrin |
title |
Evaluation of otolith shape analysis as a tool for discriminating adults of Baltic cod stocks |
title_short |
Evaluation of otolith shape analysis as a tool for discriminating adults of Baltic cod stocks |
title_full |
Evaluation of otolith shape analysis as a tool for discriminating adults of Baltic cod stocks |
title_fullStr |
Evaluation of otolith shape analysis as a tool for discriminating adults of Baltic cod stocks |
title_full_unstemmed |
Evaluation of otolith shape analysis as a tool for discriminating adults of Baltic cod stocks |
title_sort |
evaluation of otolith shape analysis as a tool for discriminating adults of baltic cod stocks |
publishDate |
2013 |
url |
https://doi.org/10.1111/jai.12145 https://www.openagrar.de/receive/timport_mods_00018107 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00018107/dn052084.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
atlantic cod Gadus morhua Greenland |
genre_facet |
atlantic cod Gadus morhua Greenland |
op_relation |
Journal of applied ichthyology -- Zeitschrift für angewandte Ichthyologie -- J Appl Ichthyol; Z Angew Ichthyol -- 0175-8659 -- 1439-0426 -- 283875-8 -- 2020412-7 -- http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1439-0426 https://doi.org/10.1111/jai.12145 https://www.openagrar.de/receive/timport_mods_00018107 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00018107/dn052084.pdf |
op_rights |
only signed in user info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1111/jai.12145 |
container_title |
Journal of Applied Ichthyology |
container_volume |
29 |
container_issue |
4 |
container_start_page |
743 |
op_container_end_page |
750 |
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1766357995656052736 |