Seasonal changes in vertical distribution patterns of cod ( Gadus morhua) in the Bornholm Basin, central Baltic Sea
Abstract Hydroacoustic single fish detection and corresponding hydrographic measurements were used to study seasonal changes in vertical distribution of adult cod ( Gadus morhua ) in relation to ambient environmental conditions in the Bornholm Basin, central Baltic Sea. Sampling was conducted in Apr...
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crwiley:10.1111/j.1365-2419.2011.00607.x 2024-09-30T14:35:16+00:00 Seasonal changes in vertical distribution patterns of cod ( Gadus morhua) in the Bornholm Basin, central Baltic Sea SCHABER, MATTHIAS HINRICHSEN, HANS‐HARALD GRÖGER, JOACHIM 2011 http://dx.doi.org/10.1111/j.1365-2419.2011.00607.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2419.2011.00607.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2419.2011.00607.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Fisheries Oceanography volume 21, issue 1, page 33-43 ISSN 1054-6006 1365-2419 journal-article 2011 crwiley https://doi.org/10.1111/j.1365-2419.2011.00607.x 2024-09-05T05:03:41Z Abstract Hydroacoustic single fish detection and corresponding hydrographic measurements were used to study seasonal changes in vertical distribution of adult cod ( Gadus morhua ) in relation to ambient environmental conditions in the Bornholm Basin, central Baltic Sea. Sampling was conducted in April, June and August covering the years 2006–2009. Vertical distribution of individual fish was resolved from hydroacoustic single‐target detection in combination with a fish‐tracking algorithm and related to ambient hydrographic conditions. Based on a generalized linear effect model, both salinity and oxygen concentration were identified as key parameters affecting cod vertical distribution. Results also showed a clear seasonal effect with a more shallow distribution as the spawning season progressed and oxygen concentrations in the deep parts of the basin deteriorated. The upper limit of the distributional range was mostly constituted by the halocline and remained rather constant, whereas increasing oxygen depletion in the deep water layers lifted the lower boundary of the vertical distribution, leading to the observed upward shift in the overall distribution pattern. The results presented in this study highlight a significant shortcoming of the assessment survey design established for this species, as the observed shift in vertical distribution is not taken into account, thus introducing a potential bias into a data series used to tune the ICES standard stock assessment of this species. Article in Journal/Newspaper Gadus morhua Wiley Online Library Fisheries Oceanography 21 1 33 43 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Hydroacoustic single fish detection and corresponding hydrographic measurements were used to study seasonal changes in vertical distribution of adult cod ( Gadus morhua ) in relation to ambient environmental conditions in the Bornholm Basin, central Baltic Sea. Sampling was conducted in April, June and August covering the years 2006–2009. Vertical distribution of individual fish was resolved from hydroacoustic single‐target detection in combination with a fish‐tracking algorithm and related to ambient hydrographic conditions. Based on a generalized linear effect model, both salinity and oxygen concentration were identified as key parameters affecting cod vertical distribution. Results also showed a clear seasonal effect with a more shallow distribution as the spawning season progressed and oxygen concentrations in the deep parts of the basin deteriorated. The upper limit of the distributional range was mostly constituted by the halocline and remained rather constant, whereas increasing oxygen depletion in the deep water layers lifted the lower boundary of the vertical distribution, leading to the observed upward shift in the overall distribution pattern. The results presented in this study highlight a significant shortcoming of the assessment survey design established for this species, as the observed shift in vertical distribution is not taken into account, thus introducing a potential bias into a data series used to tune the ICES standard stock assessment of this species. |
format |
Article in Journal/Newspaper |
author |
SCHABER, MATTHIAS HINRICHSEN, HANS‐HARALD GRÖGER, JOACHIM |
spellingShingle |
SCHABER, MATTHIAS HINRICHSEN, HANS‐HARALD GRÖGER, JOACHIM Seasonal changes in vertical distribution patterns of cod ( Gadus morhua) in the Bornholm Basin, central Baltic Sea |
author_facet |
SCHABER, MATTHIAS HINRICHSEN, HANS‐HARALD GRÖGER, JOACHIM |
author_sort |
SCHABER, MATTHIAS |
title |
Seasonal changes in vertical distribution patterns of cod ( Gadus morhua) in the Bornholm Basin, central Baltic Sea |
title_short |
Seasonal changes in vertical distribution patterns of cod ( Gadus morhua) in the Bornholm Basin, central Baltic Sea |
title_full |
Seasonal changes in vertical distribution patterns of cod ( Gadus morhua) in the Bornholm Basin, central Baltic Sea |
title_fullStr |
Seasonal changes in vertical distribution patterns of cod ( Gadus morhua) in the Bornholm Basin, central Baltic Sea |
title_full_unstemmed |
Seasonal changes in vertical distribution patterns of cod ( Gadus morhua) in the Bornholm Basin, central Baltic Sea |
title_sort |
seasonal changes in vertical distribution patterns of cod ( gadus morhua) in the bornholm basin, central baltic sea |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1111/j.1365-2419.2011.00607.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2419.2011.00607.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2419.2011.00607.x |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Fisheries Oceanography volume 21, issue 1, page 33-43 ISSN 1054-6006 1365-2419 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-2419.2011.00607.x |
container_title |
Fisheries Oceanography |
container_volume |
21 |
container_issue |
1 |
container_start_page |
33 |
op_container_end_page |
43 |
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1811638587305754624 |