Cod Gadus morhua L. populations as behavioural units: inference from time series on juvenile abundance in the eastern Skagerrak
Abundance and distribution of cod Gadus morhua in various size intervals and age groups between 2000 and 2005 were followed in coastal trawl surveys. In spite of a reduction in fishing pressure in recent years and high cod recruitment in the Skagerrak region in 2001 and 2003, no recovery could be ev...
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crwiley:10.1111/j.1095-8649.2006.01272.x 2024-06-02T08:06:55+00:00 Cod Gadus morhua L. populations as behavioural units: inference from time series on juvenile abundance in the eastern Skagerrak Svedäng, H. Svenson, A. 2006 http://dx.doi.org/10.1111/j.1095-8649.2006.01272.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.2006.01272.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.2006.01272.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 69, issue sc, page 151-164 ISSN 0022-1112 1095-8649 journal-article 2006 crwiley https://doi.org/10.1111/j.1095-8649.2006.01272.x 2024-05-03T11:24:03Z Abundance and distribution of cod Gadus morhua in various size intervals and age groups between 2000 and 2005 were followed in coastal trawl surveys. In spite of a reduction in fishing pressure in recent years and high cod recruitment in the Skagerrak region in 2001 and 2003, no recovery could be evidenced. The survey data clearly showed that low cod density areas were not recolonized, even though abundance of juvenile cod remained high for about a year after the recruitment episodes. Increased abundance of fish >400 mm total length was only discernible at some scattered locations where other studies also have suggested local populations still to be present. The intermittent high recruitment has been linked to an inflow of egg and larvae from the North Sea, a theory which also has gained support from genetic studies. It was thus argued that the disappearance of the juvenile cod from the inshore is an effect of a migratory behaviour; the fish of offshore origin eventually leave the coast for the open Skagerrak or the North Sea. These findings support a view on cod populations as essentially behavioural entities, whereas dispersal of early life stages may be less important as a structuring mechanism. Article in Journal/Newspaper Gadus morhua Wiley Online Library Journal of Fish Biology 69 sc 151 164 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abundance and distribution of cod Gadus morhua in various size intervals and age groups between 2000 and 2005 were followed in coastal trawl surveys. In spite of a reduction in fishing pressure in recent years and high cod recruitment in the Skagerrak region in 2001 and 2003, no recovery could be evidenced. The survey data clearly showed that low cod density areas were not recolonized, even though abundance of juvenile cod remained high for about a year after the recruitment episodes. Increased abundance of fish >400 mm total length was only discernible at some scattered locations where other studies also have suggested local populations still to be present. The intermittent high recruitment has been linked to an inflow of egg and larvae from the North Sea, a theory which also has gained support from genetic studies. It was thus argued that the disappearance of the juvenile cod from the inshore is an effect of a migratory behaviour; the fish of offshore origin eventually leave the coast for the open Skagerrak or the North Sea. These findings support a view on cod populations as essentially behavioural entities, whereas dispersal of early life stages may be less important as a structuring mechanism. |
format |
Article in Journal/Newspaper |
author |
Svedäng, H. Svenson, A. |
spellingShingle |
Svedäng, H. Svenson, A. Cod Gadus morhua L. populations as behavioural units: inference from time series on juvenile abundance in the eastern Skagerrak |
author_facet |
Svedäng, H. Svenson, A. |
author_sort |
Svedäng, H. |
title |
Cod Gadus morhua L. populations as behavioural units: inference from time series on juvenile abundance in the eastern Skagerrak |
title_short |
Cod Gadus morhua L. populations as behavioural units: inference from time series on juvenile abundance in the eastern Skagerrak |
title_full |
Cod Gadus morhua L. populations as behavioural units: inference from time series on juvenile abundance in the eastern Skagerrak |
title_fullStr |
Cod Gadus morhua L. populations as behavioural units: inference from time series on juvenile abundance in the eastern Skagerrak |
title_full_unstemmed |
Cod Gadus morhua L. populations as behavioural units: inference from time series on juvenile abundance in the eastern Skagerrak |
title_sort |
cod gadus morhua l. populations as behavioural units: inference from time series on juvenile abundance in the eastern skagerrak |
publisher |
Wiley |
publishDate |
2006 |
url |
http://dx.doi.org/10.1111/j.1095-8649.2006.01272.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.2006.01272.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.2006.01272.x |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Journal of Fish Biology volume 69, issue sc, page 151-164 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.2006.01272.x |
container_title |
Journal of Fish Biology |
container_volume |
69 |
container_issue |
sc |
container_start_page |
151 |
op_container_end_page |
164 |
_version_ |
1800751915594678272 |