Seeking the True Time: Exploring Otolith Chemistry as an Age-Determination Tool
Fish otoliths' chronometric properties make them useful for age and growth rate estimation in fisheries management. For the Eastern Baltic Sea cod stock (Gadus morhua), unclear seasonal growth zones in otoliths have resulted in unreliable age and growth information. Here, a new age estimation m...
Published in: | Journal of Fish Biology |
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Main Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2020
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Online Access: | https://orbit.dtu.dk/en/publications/ecd96af4-26c3-4fbc-94c9-99469170440d https://doi.org/10.1111/jfb.14422 https://backend.orbit.dtu.dk/ws/files/215031594/BERAT_jfb.14422.pdf https://backend.orbit.dtu.dk/ws/files/217951343/jfb.14422.pdf |
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ftdtupubl:oai:pure.atira.dk:publications/ecd96af4-26c3-4fbc-94c9-99469170440d 2024-06-09T07:46:04+00:00 Seeking the True Time: Exploring Otolith Chemistry as an Age-Determination Tool Heimbrand, Yvette Limburg, Karin E. Hüssy, Karin Casini, Michele Sjöberg, Rajlie Palmén Bratt, Anne-Marie Levinsky, Svend-Erik Karpushevskaia, Anastasia Radtke, Krzysztof Öhlund, Jill 2020 application/pdf https://orbit.dtu.dk/en/publications/ecd96af4-26c3-4fbc-94c9-99469170440d https://doi.org/10.1111/jfb.14422 https://backend.orbit.dtu.dk/ws/files/215031594/BERAT_jfb.14422.pdf https://backend.orbit.dtu.dk/ws/files/217951343/jfb.14422.pdf eng eng https://orbit.dtu.dk/en/publications/ecd96af4-26c3-4fbc-94c9-99469170440d info:eu-repo/semantics/openAccess Heimbrand , Y , Limburg , K E , Hüssy , K , Casini , M , Sjöberg , R , Palmén Bratt , A-M , Levinsky , S-E , Karpushevskaia , A , Radtke , K & Öhlund , J 2020 , ' Seeking the True Time: Exploring Otolith Chemistry as an Age-Determination Tool ' , Journal of Fish Biology , vol. 97 , no. 2 , pp. 552-565 . https://doi.org/10.1111/jfb.14422 Age estimation Baltic sea Gadus morhua LA-ICP-MS Otolith chemistry Seasonal patterns /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water article 2020 ftdtupubl https://doi.org/10.1111/jfb.14422 2024-05-15T00:10:25Z Fish otoliths' chronometric properties make them useful for age and growth rate estimation in fisheries management. For the Eastern Baltic Sea cod stock (Gadus morhua), unclear seasonal growth zones in otoliths have resulted in unreliable age and growth information. Here, a new age estimation method based on seasonal patterns in trace elemental otolith incorporation was tested for the first time and compared with the traditional method of visually counting growth zones, using otoliths from the Baltic and North seas. Various trace elemental ratios, linked to fish metabolic activity (higher in summer) or external environment (migration to colder, deeper habitats with higher salinity in winter), were tested for age estimation based on assessing their seasonal variations in concentration. Mg:Ca and P:Ca, both proxies for growth and metabolic activity, showed greatest seasonality and therefore have the best potential to be used as chemical clocks. Otolith image readability was significantly lower in the Baltic than in the North Sea. The chemical (novel) method had an overall greater precision and percent agreement among readers (11.2%, 74.0%) than the visual (traditional) method (23.1%, 51.0%). Visual readers generally selected more highly contrasting zones as annuli whereas the chemical readers identified brighter regions within the first two annuli, and darker zones thereafter. Visual estimates produced significantly higher, more variable ages than did the chemical ones. Based on the analyses in our study, we suggest that otolith micro-chemistry is a promising alternative ageing method for fish populations difficult to age, such as the Eastern Baltic cod. This article is protected by copyright. All rights reserved. Article in Journal/Newspaper Gadus morhua Technical University of Denmark: DTU Orbit Journal of Fish Biology 97 2 552 565 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Age estimation Baltic sea Gadus morhua LA-ICP-MS Otolith chemistry Seasonal patterns /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
spellingShingle |
Age estimation Baltic sea Gadus morhua LA-ICP-MS Otolith chemistry Seasonal patterns /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water Heimbrand, Yvette Limburg, Karin E. Hüssy, Karin Casini, Michele Sjöberg, Rajlie Palmén Bratt, Anne-Marie Levinsky, Svend-Erik Karpushevskaia, Anastasia Radtke, Krzysztof Öhlund, Jill Seeking the True Time: Exploring Otolith Chemistry as an Age-Determination Tool |
topic_facet |
Age estimation Baltic sea Gadus morhua LA-ICP-MS Otolith chemistry Seasonal patterns /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
description |
Fish otoliths' chronometric properties make them useful for age and growth rate estimation in fisheries management. For the Eastern Baltic Sea cod stock (Gadus morhua), unclear seasonal growth zones in otoliths have resulted in unreliable age and growth information. Here, a new age estimation method based on seasonal patterns in trace elemental otolith incorporation was tested for the first time and compared with the traditional method of visually counting growth zones, using otoliths from the Baltic and North seas. Various trace elemental ratios, linked to fish metabolic activity (higher in summer) or external environment (migration to colder, deeper habitats with higher salinity in winter), were tested for age estimation based on assessing their seasonal variations in concentration. Mg:Ca and P:Ca, both proxies for growth and metabolic activity, showed greatest seasonality and therefore have the best potential to be used as chemical clocks. Otolith image readability was significantly lower in the Baltic than in the North Sea. The chemical (novel) method had an overall greater precision and percent agreement among readers (11.2%, 74.0%) than the visual (traditional) method (23.1%, 51.0%). Visual readers generally selected more highly contrasting zones as annuli whereas the chemical readers identified brighter regions within the first two annuli, and darker zones thereafter. Visual estimates produced significantly higher, more variable ages than did the chemical ones. Based on the analyses in our study, we suggest that otolith micro-chemistry is a promising alternative ageing method for fish populations difficult to age, such as the Eastern Baltic cod. This article is protected by copyright. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Heimbrand, Yvette Limburg, Karin E. Hüssy, Karin Casini, Michele Sjöberg, Rajlie Palmén Bratt, Anne-Marie Levinsky, Svend-Erik Karpushevskaia, Anastasia Radtke, Krzysztof Öhlund, Jill |
author_facet |
Heimbrand, Yvette Limburg, Karin E. Hüssy, Karin Casini, Michele Sjöberg, Rajlie Palmén Bratt, Anne-Marie Levinsky, Svend-Erik Karpushevskaia, Anastasia Radtke, Krzysztof Öhlund, Jill |
author_sort |
Heimbrand, Yvette |
title |
Seeking the True Time: Exploring Otolith Chemistry as an Age-Determination Tool |
title_short |
Seeking the True Time: Exploring Otolith Chemistry as an Age-Determination Tool |
title_full |
Seeking the True Time: Exploring Otolith Chemistry as an Age-Determination Tool |
title_fullStr |
Seeking the True Time: Exploring Otolith Chemistry as an Age-Determination Tool |
title_full_unstemmed |
Seeking the True Time: Exploring Otolith Chemistry as an Age-Determination Tool |
title_sort |
seeking the true time: exploring otolith chemistry as an age-determination tool |
publishDate |
2020 |
url |
https://orbit.dtu.dk/en/publications/ecd96af4-26c3-4fbc-94c9-99469170440d https://doi.org/10.1111/jfb.14422 https://backend.orbit.dtu.dk/ws/files/215031594/BERAT_jfb.14422.pdf https://backend.orbit.dtu.dk/ws/files/217951343/jfb.14422.pdf |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Heimbrand , Y , Limburg , K E , Hüssy , K , Casini , M , Sjöberg , R , Palmén Bratt , A-M , Levinsky , S-E , Karpushevskaia , A , Radtke , K & Öhlund , J 2020 , ' Seeking the True Time: Exploring Otolith Chemistry as an Age-Determination Tool ' , Journal of Fish Biology , vol. 97 , no. 2 , pp. 552-565 . https://doi.org/10.1111/jfb.14422 |
op_relation |
https://orbit.dtu.dk/en/publications/ecd96af4-26c3-4fbc-94c9-99469170440d |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1111/jfb.14422 |
container_title |
Journal of Fish Biology |
container_volume |
97 |
container_issue |
2 |
container_start_page |
552 |
op_container_end_page |
565 |
_version_ |
1801375819006738432 |