Gillnet fishers’ knowledge reveals seasonality in depth and habitat use of cod (Gadus morhua) in the Western Baltic Sea
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 co...
Published in: | ICES Journal of Marine Science |
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ftopenagrar:oai:www.openagrar.de:openagrar_mods_00064456 2023-05-15T16:19:15+02:00 Gillnet fishers’ knowledge reveals seasonality in depth and habitat use of cod (Gadus morhua) in the Western Baltic Sea Funk, Steffen Christian Krumme, Uwe Temming, Axel Möllmann, Christian 2020 https://doi.org/10.1093/icesjms/fsaa071 https://www.openagrar.de/receive/openagrar_mods_00064456 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00033555/dn062300.pdf eng eng ICES journal of marine science : journal du Conseil -- ICES J Mar Sci -- 1054-3139 -- 29056-7 https://doi.org/10.1093/icesjms/fsaa071 https://www.openagrar.de/receive/openagrar_mods_00064456 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00033555/dn062300.pdf public https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess CC-BY Text ddc:570 cod -- habitat use -- local knowledge -- spatio-temporal distribution -- Western Baltic Sea article Text 2020 ftopenagrar https://doi.org/10.1093/icesjms/fsaa071 2023-03-06T00:09:34Z 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 15m 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 OpenAgrar (OA) ICES Journal of Marine Science 77 5 1816 1829 |
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Open Polar |
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OpenAgrar (OA) |
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ftopenagrar |
language |
English |
topic |
Text ddc:570 cod -- habitat use -- local knowledge -- spatio-temporal distribution -- Western Baltic Sea |
spellingShingle |
Text ddc:570 cod -- habitat use -- local knowledge -- spatio-temporal distribution -- Western Baltic Sea Funk, Steffen Christian 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 |
topic_facet |
Text ddc:570 cod -- habitat use -- local knowledge -- spatio-temporal distribution -- Western Baltic Sea |
description |
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 15m 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. |
format |
Article in Journal/Newspaper |
author |
Funk, Steffen Christian Krumme, Uwe Temming, Axel Möllmann, Christian |
author_facet |
Funk, Steffen Christian Krumme, Uwe Temming, Axel Möllmann, Christian |
author_sort |
Funk, Steffen Christian |
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 |
publishDate |
2020 |
url |
https://doi.org/10.1093/icesjms/fsaa071 https://www.openagrar.de/receive/openagrar_mods_00064456 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00033555/dn062300.pdf |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_relation |
ICES journal of marine science : journal du Conseil -- ICES J Mar Sci -- 1054-3139 -- 29056-7 https://doi.org/10.1093/icesjms/fsaa071 https://www.openagrar.de/receive/openagrar_mods_00064456 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00033555/dn062300.pdf |
op_rights |
public https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
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_ |
1766005609548742656 |