Age validation of juvenile cod in the Western Baltic Sea
Abstract The methods routinely used to estimate fish age are often un-validated and susceptible to errors and uncertainties. Despite numerous attempts, age determination of western Baltic cod (WBC, Gadus morhua) using otoliths is still unreliable, predominantly due to inconsistent interpretation of...
Published in: | ICES Journal of Marine Science |
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Oxford University Press (OUP)
2018
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsy175 http://academic.oup.com/icesjms/article-pdf/76/2/430/31238464/fsy175.pdf |
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croxfordunivpr:10.1093/icesjms/fsy175 2023-10-01T03:56:05+02:00 Age validation of juvenile cod in the Western Baltic Sea McQueen, Kate Hrabowski, Josef Krumme, Uwe Arkhipkin, Alexander TABACOD BalticSea2020 European Commission’s Data Collection Framework DCF 2018 http://dx.doi.org/10.1093/icesjms/fsy175 http://academic.oup.com/icesjms/article-pdf/76/2/430/31238464/fsy175.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model ICES Journal of Marine Science volume 76, issue 2, page 430-441 ISSN 1054-3139 1095-9289 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2018 croxfordunivpr https://doi.org/10.1093/icesjms/fsy175 2023-09-08T10:48:09Z Abstract The methods routinely used to estimate fish age are often un-validated and susceptible to errors and uncertainties. Despite numerous attempts, age determination of western Baltic cod (WBC, Gadus morhua) using otoliths is still unreliable, predominantly due to inconsistent interpretation of the first translucent zone (TZ). Length-frequencies of undersized (<38 cm) cod collected during 2013–2016 from pound nets near Fehmarn Island were analysed to understand TZ formation patterns. A clear minimum separated two cohorts within the length-frequency samples every year. The length-frequency information was combined with otolith edge analysis to observe the development of TZs in age-0 and age-1 cod otoliths, and to validate the timing of TZ formation, which was consistently completed between September and December. Mean TZ diameters of 4 917 juvenile cod otoliths varied between cohorts (mean diameters of the first TZ: 2.0 ± 0.5 mm; second TZ: 3.9 mm ± 0.5) and TZ diameter variation was found to be related to individual growth rate. The timing of formation of the first TZ was positively related to water temperature, and was confirmed as a “summer ring” rather than a “winter ring”. TZ formation and shallow-water occupancy suggest an influence of peak summer water temperatures on WBC ecology. An age reading guide for juvenile WBC otoliths is provided. Article in Journal/Newspaper Gadus morhua Oxford University Press (via Crossref) ICES Journal of Marine Science 76 2 430 441 |
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Open Polar |
collection |
Oxford University Press (via Crossref) |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography McQueen, Kate Hrabowski, Josef Krumme, Uwe Age validation of juvenile cod in the Western Baltic Sea |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract The methods routinely used to estimate fish age are often un-validated and susceptible to errors and uncertainties. Despite numerous attempts, age determination of western Baltic cod (WBC, Gadus morhua) using otoliths is still unreliable, predominantly due to inconsistent interpretation of the first translucent zone (TZ). Length-frequencies of undersized (<38 cm) cod collected during 2013–2016 from pound nets near Fehmarn Island were analysed to understand TZ formation patterns. A clear minimum separated two cohorts within the length-frequency samples every year. The length-frequency information was combined with otolith edge analysis to observe the development of TZs in age-0 and age-1 cod otoliths, and to validate the timing of TZ formation, which was consistently completed between September and December. Mean TZ diameters of 4 917 juvenile cod otoliths varied between cohorts (mean diameters of the first TZ: 2.0 ± 0.5 mm; second TZ: 3.9 mm ± 0.5) and TZ diameter variation was found to be related to individual growth rate. The timing of formation of the first TZ was positively related to water temperature, and was confirmed as a “summer ring” rather than a “winter ring”. TZ formation and shallow-water occupancy suggest an influence of peak summer water temperatures on WBC ecology. An age reading guide for juvenile WBC otoliths is provided. |
author2 |
Arkhipkin, Alexander TABACOD BalticSea2020 European Commission’s Data Collection Framework DCF |
format |
Article in Journal/Newspaper |
author |
McQueen, Kate Hrabowski, Josef Krumme, Uwe |
author_facet |
McQueen, Kate Hrabowski, Josef Krumme, Uwe |
author_sort |
McQueen, Kate |
title |
Age validation of juvenile cod in the Western Baltic Sea |
title_short |
Age validation of juvenile cod in the Western Baltic Sea |
title_full |
Age validation of juvenile cod in the Western Baltic Sea |
title_fullStr |
Age validation of juvenile cod in the Western Baltic Sea |
title_full_unstemmed |
Age validation of juvenile cod in the Western Baltic Sea |
title_sort |
age validation of juvenile cod in the western baltic sea |
publisher |
Oxford University Press (OUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1093/icesjms/fsy175 http://academic.oup.com/icesjms/article-pdf/76/2/430/31238464/fsy175.pdf |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
ICES Journal of Marine Science volume 76, issue 2, page 430-441 ISSN 1054-3139 1095-9289 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/icesjms/fsy175 |
container_title |
ICES Journal of Marine Science |
container_volume |
76 |
container_issue |
2 |
container_start_page |
430 |
op_container_end_page |
441 |
_version_ |
1778525188991746048 |