Gillnet fishers’ knowledge reveals seasonality in depth and habitat use of cod (Gadus morhua) in the Western Baltic Sea
Abstract Practical and applied knowledge of local fishers can help to improve our understanding of target species ecology and fisheries management decisions. In the Western Baltic Sea (WBS), the spatio-temporal distribution of cod is still largely unknown despite decades of research. We studied chan...
Published in: | ICES Journal of Marine Science |
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Oxford University Press (OUP)
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsaa071 http://academic.oup.com/icesjms/article-pdf/77/5/1816/33703797/fsaa071.pdf |
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croxfordunivpr:10.1093/icesjms/fsaa071 2024-09-15T18:07:20+00:00 Gillnet fishers’ knowledge reveals seasonality in depth and habitat use of cod (Gadus morhua) in the Western Baltic Sea Funk, Steffen Krumme, Uwe Temming, Axel Möllmann, Christian Thurstan, Ruth European Maritime and Fisheries Fund European Union European Parliament and of the Council BONUS BLUEWEBS EU, the Academy of Finland, Projektträger Jülich (PtJ), Germany State Education Development Agency of Latvia National Centre for Research and Development, Poland Swedish Research Council Formas Federal Ministry of Education and Research of Germany 2020 http://dx.doi.org/10.1093/icesjms/fsaa071 http://academic.oup.com/icesjms/article-pdf/77/5/1816/33703797/fsaa071.pdf en eng Oxford University Press (OUP) http://creativecommons.org/licenses/by/4.0/ ICES Journal of Marine Science volume 77, issue 5, page 1816-1829 ISSN 1095-9289 journal-article 2020 croxfordunivpr https://doi.org/10.1093/icesjms/fsaa071 2024-07-22T04:24:20Z Abstract Practical and applied knowledge of local fishers can help to improve our understanding of target species ecology and fisheries management decisions. In the Western Baltic Sea (WBS), the spatio-temporal distribution of cod is still largely unknown despite decades of research. We studied changes in cod distribution by obtaining information on temporal depth and habitat use of cod from commercial gillnet fishers using semi-directed interviews supplemented by at-sea observer data. Linear and non-linear regression analyses revealed significant relationships between depth use of cod and sea surface temperature (SST) as well as thermal stratification. Moreover, habitat use was related to SST and residence depth of cod. Areas deeper than 15 m were favoured from late December until March during low SST and a mixed water column (spawning) and also from July until August during high SST and strong thermal stratification (summer aestivation). Shallower areas were favoured during the rest of the year. The depth and habitat use displayed distinct seasonal up- and downslope movements of cod. This study highlights the importance of shallow-water and structured habitats for cod in the WBS and the value of local knowledge held by fishers for a better understanding of the distributional dynamics of important marine resource populations. Article in Journal/Newspaper Gadus morhua Oxford University Press ICES Journal of Marine Science 77 5 1816 1829 |
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Oxford University Press |
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croxfordunivpr |
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description |
Abstract Practical and applied knowledge of local fishers can help to improve our understanding of target species ecology and fisheries management decisions. In the Western Baltic Sea (WBS), the spatio-temporal distribution of cod is still largely unknown despite decades of research. We studied changes in cod distribution by obtaining information on temporal depth and habitat use of cod from commercial gillnet fishers using semi-directed interviews supplemented by at-sea observer data. Linear and non-linear regression analyses revealed significant relationships between depth use of cod and sea surface temperature (SST) as well as thermal stratification. Moreover, habitat use was related to SST and residence depth of cod. Areas deeper than 15 m were favoured from late December until March during low SST and a mixed water column (spawning) and also from July until August during high SST and strong thermal stratification (summer aestivation). Shallower areas were favoured during the rest of the year. The depth and habitat use displayed distinct seasonal up- and downslope movements of cod. This study highlights the importance of shallow-water and structured habitats for cod in the WBS and the value of local knowledge held by fishers for a better understanding of the distributional dynamics of important marine resource populations. |
author2 |
Thurstan, Ruth European Maritime and Fisheries Fund European Union European Parliament and of the Council BONUS BLUEWEBS EU, the Academy of Finland, Projektträger Jülich (PtJ), Germany State Education Development Agency of Latvia National Centre for Research and Development, Poland Swedish Research Council Formas Federal Ministry of Education and Research of Germany |
format |
Article in Journal/Newspaper |
author |
Funk, Steffen Krumme, Uwe Temming, Axel Möllmann, Christian |
spellingShingle |
Funk, Steffen Krumme, Uwe Temming, Axel Möllmann, Christian Gillnet fishers’ knowledge reveals seasonality in depth and habitat use of cod (Gadus morhua) in the Western Baltic Sea |
author_facet |
Funk, Steffen Krumme, Uwe Temming, Axel Möllmann, Christian |
author_sort |
Funk, Steffen |
title |
Gillnet fishers’ knowledge reveals seasonality in depth and habitat use of cod (Gadus morhua) in the Western Baltic Sea |
title_short |
Gillnet fishers’ knowledge reveals seasonality in depth and habitat use of cod (Gadus morhua) in the Western Baltic Sea |
title_full |
Gillnet fishers’ knowledge reveals seasonality in depth and habitat use of cod (Gadus morhua) in the Western Baltic Sea |
title_fullStr |
Gillnet fishers’ knowledge reveals seasonality in depth and habitat use of cod (Gadus morhua) in the Western Baltic Sea |
title_full_unstemmed |
Gillnet fishers’ knowledge reveals seasonality in depth and habitat use of cod (Gadus morhua) in the Western Baltic Sea |
title_sort |
gillnet fishers’ knowledge reveals seasonality in depth and habitat use of cod (gadus morhua) in the western baltic sea |
publisher |
Oxford University Press (OUP) |
publishDate |
2020 |
url |
http://dx.doi.org/10.1093/icesjms/fsaa071 http://academic.oup.com/icesjms/article-pdf/77/5/1816/33703797/fsaa071.pdf |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
ICES Journal of Marine Science volume 77, issue 5, page 1816-1829 ISSN 1095-9289 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/icesjms/fsaa071 |
container_title |
ICES Journal of Marine Science |
container_volume |
77 |
container_issue |
5 |
container_start_page |
1816 |
op_container_end_page |
1829 |
_version_ |
1810444710624362496 |