Responses of Cod ( Gadus morhua) and Haddock ( Melanogrammus aeglefinus) to Baited Hooks in the Natural Environment
The behaviour of cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) towards baited hooks was observed in the sea with underwater television. Both species exhibited a diel rhythm of feeding activity most pronounced in cod, with an increase at dawn and a decrease at dusk. The activity rhythm of...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
1989
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Online Access: | http://dx.doi.org/10.1139/f89-189 http://www.nrcresearchpress.com/doi/pdf/10.1139/f89-189 |
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crcansciencepubl:10.1139/f89-189 2024-09-15T18:07:15+00:00 Responses of Cod ( Gadus morhua) and Haddock ( Melanogrammus aeglefinus) to Baited Hooks in the Natural Environment Løkkeborg, Svein Bjordal, Åsmund Fernö, Anders 1989 http://dx.doi.org/10.1139/f89-189 http://www.nrcresearchpress.com/doi/pdf/10.1139/f89-189 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 46, issue 9, page 1478-1483 ISSN 0706-652X 1205-7533 journal-article 1989 crcansciencepubl https://doi.org/10.1139/f89-189 2024-08-08T04:13:37Z The behaviour of cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) towards baited hooks was observed in the sea with underwater television. Both species exhibited a diel rhythm of feeding activity most pronounced in cod, with an increase at dawn and a decrease at dusk. The activity rhythm of cod changed from bimodal with peaks in the morning and afternoon in September, to unimodal in December. Haddock showed a less clear activity rhythm during daytime. Activity of fish decreased at high current velocities. Both cod and haddock swam upstream towards baited hooks. More haddock responded to the bait than cod, but haddock showed a less intense response characterized by biting repeatedly at parts of the bait, whereas cod completely ingested the bait and thereby increased the probability of getting hooked. The observed difference in hooking behaviour between cod and haddock explains differences between the species found in longline fishing trials with different bait sizes and hook designs. Article in Journal/Newspaper Gadus morhua Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 46 9 1478 1483 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
The behaviour of cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) towards baited hooks was observed in the sea with underwater television. Both species exhibited a diel rhythm of feeding activity most pronounced in cod, with an increase at dawn and a decrease at dusk. The activity rhythm of cod changed from bimodal with peaks in the morning and afternoon in September, to unimodal in December. Haddock showed a less clear activity rhythm during daytime. Activity of fish decreased at high current velocities. Both cod and haddock swam upstream towards baited hooks. More haddock responded to the bait than cod, but haddock showed a less intense response characterized by biting repeatedly at parts of the bait, whereas cod completely ingested the bait and thereby increased the probability of getting hooked. The observed difference in hooking behaviour between cod and haddock explains differences between the species found in longline fishing trials with different bait sizes and hook designs. |
format |
Article in Journal/Newspaper |
author |
Løkkeborg, Svein Bjordal, Åsmund Fernö, Anders |
spellingShingle |
Løkkeborg, Svein Bjordal, Åsmund Fernö, Anders Responses of Cod ( Gadus morhua) and Haddock ( Melanogrammus aeglefinus) to Baited Hooks in the Natural Environment |
author_facet |
Løkkeborg, Svein Bjordal, Åsmund Fernö, Anders |
author_sort |
Løkkeborg, Svein |
title |
Responses of Cod ( Gadus morhua) and Haddock ( Melanogrammus aeglefinus) to Baited Hooks in the Natural Environment |
title_short |
Responses of Cod ( Gadus morhua) and Haddock ( Melanogrammus aeglefinus) to Baited Hooks in the Natural Environment |
title_full |
Responses of Cod ( Gadus morhua) and Haddock ( Melanogrammus aeglefinus) to Baited Hooks in the Natural Environment |
title_fullStr |
Responses of Cod ( Gadus morhua) and Haddock ( Melanogrammus aeglefinus) to Baited Hooks in the Natural Environment |
title_full_unstemmed |
Responses of Cod ( Gadus morhua) and Haddock ( Melanogrammus aeglefinus) to Baited Hooks in the Natural Environment |
title_sort |
responses of cod ( gadus morhua) and haddock ( melanogrammus aeglefinus) to baited hooks in the natural environment |
publisher |
Canadian Science Publishing |
publishDate |
1989 |
url |
http://dx.doi.org/10.1139/f89-189 http://www.nrcresearchpress.com/doi/pdf/10.1139/f89-189 |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 46, issue 9, page 1478-1483 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f89-189 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
46 |
container_issue |
9 |
container_start_page |
1478 |
op_container_end_page |
1483 |
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1810444629904982016 |