Seasonal variation in cod feeding and growth in a changing sea
Seasonal variation in feeding and growth of 3- to 9-year-old Atlantic cod (Gadus morhua) was studied using data from joint Norwegian–Russian surveys in January–March (winter survey) and September–August (ecosystem survey) in the Barents Sea. The study encompassed the warmest period on record, with l...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Canadian Science Publishing
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crcansciencepubl:10.1139/cjfas-2015-0052 2023-12-17T10:27:03+01:00 Seasonal variation in cod feeding and growth in a changing sea Johannesen, Edda Johansen, Geir Odd Korsbrekke, Knut Marshall, C. Tara 2016 http://dx.doi.org/10.1139/cjfas-2015-0052 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2015-0052 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2015-0052 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 73, issue 2, page 235-245 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2016 crcansciencepubl https://doi.org/10.1139/cjfas-2015-0052 2023-11-19T13:38:57Z Seasonal variation in feeding and growth of 3- to 9-year-old Atlantic cod (Gadus morhua) was studied using data from joint Norwegian–Russian surveys in January–March (winter survey) and September–August (ecosystem survey) in the Barents Sea. The study encompassed the warmest period on record, with large cod stock and both low (2004–2007) and high (2008–2013) abundance of Barents Sea cod’s main prey, capelin (Mallotus villosus). Feeding on capelin was most important in winter. Energy acquisition (kJ·day −1 ) was higher during fall, but in years with high capelin abundance the seasonal difference was smaller. There was no difference in energy acquisition in years with high and low capelin abundance, underpinning recent findings on decoupling between capelin abundance and cod demography. Compensatory feeding on alternative prey takes place in fall, but not in winter. These findings were consistent across age groups. The results found for energy acquisition was mirrored in growth; in years with low capelin abundance, there was a seasonal difference in growth, whereas in years with high capelin abundance, the difference was absent. Article in Journal/Newspaper atlantic cod Barents Sea Gadus morhua Canadian Science Publishing (via Crossref) Barents Sea Canadian Journal of Fisheries and Aquatic Sciences 73 2 235 245 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Johannesen, Edda Johansen, Geir Odd Korsbrekke, Knut Seasonal variation in cod feeding and growth in a changing sea |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Seasonal variation in feeding and growth of 3- to 9-year-old Atlantic cod (Gadus morhua) was studied using data from joint Norwegian–Russian surveys in January–March (winter survey) and September–August (ecosystem survey) in the Barents Sea. The study encompassed the warmest period on record, with large cod stock and both low (2004–2007) and high (2008–2013) abundance of Barents Sea cod’s main prey, capelin (Mallotus villosus). Feeding on capelin was most important in winter. Energy acquisition (kJ·day −1 ) was higher during fall, but in years with high capelin abundance the seasonal difference was smaller. There was no difference in energy acquisition in years with high and low capelin abundance, underpinning recent findings on decoupling between capelin abundance and cod demography. Compensatory feeding on alternative prey takes place in fall, but not in winter. These findings were consistent across age groups. The results found for energy acquisition was mirrored in growth; in years with low capelin abundance, there was a seasonal difference in growth, whereas in years with high capelin abundance, the difference was absent. |
author2 |
Marshall, C. Tara |
format |
Article in Journal/Newspaper |
author |
Johannesen, Edda Johansen, Geir Odd Korsbrekke, Knut |
author_facet |
Johannesen, Edda Johansen, Geir Odd Korsbrekke, Knut |
author_sort |
Johannesen, Edda |
title |
Seasonal variation in cod feeding and growth in a changing sea |
title_short |
Seasonal variation in cod feeding and growth in a changing sea |
title_full |
Seasonal variation in cod feeding and growth in a changing sea |
title_fullStr |
Seasonal variation in cod feeding and growth in a changing sea |
title_full_unstemmed |
Seasonal variation in cod feeding and growth in a changing sea |
title_sort |
seasonal variation in cod feeding and growth in a changing sea |
publisher |
Canadian Science Publishing |
publishDate |
2016 |
url |
http://dx.doi.org/10.1139/cjfas-2015-0052 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2015-0052 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2015-0052 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
atlantic cod Barents Sea Gadus morhua |
genre_facet |
atlantic cod Barents Sea Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 73, issue 2, page 235-245 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjfas-2015-0052 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
73 |
container_issue |
2 |
container_start_page |
235 |
op_container_end_page |
245 |
_version_ |
1785578829298794496 |