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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Online Access: | https://oceanrep.geomar.de/id/eprint/29799/ https://oceanrep.geomar.de/id/eprint/29799/1/jai12145.pdf https://doi.org/10.1111/jai.12145 |
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ftoceanrep:oai:oceanrep.geomar.de:29799 2023-05-15T15:27:34+02:00 Evaluation of otolith shape analysis as a tool for discriminating adults of Baltic cod stocks Paul, K. Oeberst, R. Hammer, C. 2013 text https://oceanrep.geomar.de/id/eprint/29799/ https://oceanrep.geomar.de/id/eprint/29799/1/jai12145.pdf https://doi.org/10.1111/jai.12145 en eng Wiley https://oceanrep.geomar.de/id/eprint/29799/1/jai12145.pdf Paul, K., Oeberst, R. and Hammer, C. (2013) Evaluation of otolith shape analysis as a tool for discriminating adults of Baltic cod stocks. Journal of Applied Ichthyology, 29 (4). pp. 743-750. DOI 10.1111/jai.12145 <https://doi.org/10.1111/jai.12145>. doi:10.1111/jai.12145 Article PeerReviewed 2013 ftoceanrep https://doi.org/10.1111/jai.12145 2023-04-07T15:20:54Z 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 OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Greenland Journal of Applied Ichthyology 29 4 743 750 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
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, K. Oeberst, R. Hammer, C. |
spellingShingle |
Paul, K. Oeberst, R. Hammer, C. Evaluation of otolith shape analysis as a tool for discriminating adults of Baltic cod stocks |
author_facet |
Paul, K. Oeberst, R. Hammer, C. |
author_sort |
Paul, K. |
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 |
publisher |
Wiley |
publishDate |
2013 |
url |
https://oceanrep.geomar.de/id/eprint/29799/ https://oceanrep.geomar.de/id/eprint/29799/1/jai12145.pdf https://doi.org/10.1111/jai.12145 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
atlantic cod Gadus morhua Greenland |
genre_facet |
atlantic cod Gadus morhua Greenland |
op_relation |
https://oceanrep.geomar.de/id/eprint/29799/1/jai12145.pdf Paul, K., Oeberst, R. and Hammer, C. (2013) Evaluation of otolith shape analysis as a tool for discriminating adults of Baltic cod stocks. Journal of Applied Ichthyology, 29 (4). pp. 743-750. DOI 10.1111/jai.12145 <https://doi.org/10.1111/jai.12145>. doi:10.1111/jai.12145 |
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 |
_version_ |
1766357986845917184 |