Size selection of Antarctic krill (Euphausia superba) in a commercial codend and trawl body
During fishing, many fish species are able to avoid the net walls of the trawl body and so the majority of size selection occurs in the codend of the net. Antarctic krill (Euphausia superba) are regarded as true planktonic organisms passively drifting with currents, but they also display self-locomo...
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ftdtupubl:oai:pure.atira.dk:publications/57cedee6-0b7d-4b5f-8069-71b18585b8c3 2024-09-15T17:40:34+00:00 Size selection of Antarctic krill (Euphausia superba) in a commercial codend and trawl body Herrmann, Bent Krag, Ludvig Ahm Krafft, Bjørn A. 2018 application/pdf https://orbit.dtu.dk/en/publications/57cedee6-0b7d-4b5f-8069-71b18585b8c3 https://doi.org/10.1016/j.fishres.2018.05.028 https://backend.orbit.dtu.dk/ws/files/185051660/untitled.pdf eng eng https://orbit.dtu.dk/en/publications/57cedee6-0b7d-4b5f-8069-71b18585b8c3 info:eu-repo/semantics/closedAccess Herrmann , B , Krag , L A & Krafft , B A 2018 , ' Size selection of Antarctic krill (Euphausia superba) in a commercial codend and trawl body ' , Fisheries Research , vol. 207 , pp. 49-54 . https://doi.org/10.1016/j.fishres.2018.05.028 article 2018 ftdtupubl https://doi.org/10.1016/j.fishres.2018.05.028 2024-08-13T00:03:05Z During fishing, many fish species are able to avoid the net walls of the trawl body and so the majority of size selection occurs in the codend of the net. Antarctic krill (Euphausia superba) are regarded as true planktonic organisms passively drifting with currents, but they also display self-locomotion by active swimming. There is a lack of knowledge regarding the behavior of krill during the fishing process, and extrapolating results obtained for other species to krill is of limited value. In the case of krill, it is largely unknown to what extent the codend versus the trawl body contributes to the size selection process. The current study aims to quantify the size selection of krill in a commercially applied codend during experimental fishing. Combining these results with a model for full trawl size selectivity it was possible to provide an insight to the size selection process in the trawl body. Specifically, the study applied a two-step approach by first estimating the size selectivity of a commercial codend and second used the codend size selectivity obtained in this study to estimate the trawl body size selectivity of a commercial trawl based on entire trawl-selectivity obtained in a previous study. The results of this two-step analysis revealed that the trawl body contributes significantly to the total size selection process, demonstrating that size selectivity of Antarctic krill in commercial trawls is affected by both the trawl body and the cod Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Technical University of Denmark: DTU Orbit Fisheries Research 207 49 54 |
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Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
description |
During fishing, many fish species are able to avoid the net walls of the trawl body and so the majority of size selection occurs in the codend of the net. Antarctic krill (Euphausia superba) are regarded as true planktonic organisms passively drifting with currents, but they also display self-locomotion by active swimming. There is a lack of knowledge regarding the behavior of krill during the fishing process, and extrapolating results obtained for other species to krill is of limited value. In the case of krill, it is largely unknown to what extent the codend versus the trawl body contributes to the size selection process. The current study aims to quantify the size selection of krill in a commercially applied codend during experimental fishing. Combining these results with a model for full trawl size selectivity it was possible to provide an insight to the size selection process in the trawl body. Specifically, the study applied a two-step approach by first estimating the size selectivity of a commercial codend and second used the codend size selectivity obtained in this study to estimate the trawl body size selectivity of a commercial trawl based on entire trawl-selectivity obtained in a previous study. The results of this two-step analysis revealed that the trawl body contributes significantly to the total size selection process, demonstrating that size selectivity of Antarctic krill in commercial trawls is affected by both the trawl body and the cod |
format |
Article in Journal/Newspaper |
author |
Herrmann, Bent Krag, Ludvig Ahm Krafft, Bjørn A. |
spellingShingle |
Herrmann, Bent Krag, Ludvig Ahm Krafft, Bjørn A. Size selection of Antarctic krill (Euphausia superba) in a commercial codend and trawl body |
author_facet |
Herrmann, Bent Krag, Ludvig Ahm Krafft, Bjørn A. |
author_sort |
Herrmann, Bent |
title |
Size selection of Antarctic krill (Euphausia superba) in a commercial codend and trawl body |
title_short |
Size selection of Antarctic krill (Euphausia superba) in a commercial codend and trawl body |
title_full |
Size selection of Antarctic krill (Euphausia superba) in a commercial codend and trawl body |
title_fullStr |
Size selection of Antarctic krill (Euphausia superba) in a commercial codend and trawl body |
title_full_unstemmed |
Size selection of Antarctic krill (Euphausia superba) in a commercial codend and trawl body |
title_sort |
size selection of antarctic krill (euphausia superba) in a commercial codend and trawl body |
publishDate |
2018 |
url |
https://orbit.dtu.dk/en/publications/57cedee6-0b7d-4b5f-8069-71b18585b8c3 https://doi.org/10.1016/j.fishres.2018.05.028 https://backend.orbit.dtu.dk/ws/files/185051660/untitled.pdf |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba |
op_source |
Herrmann , B , Krag , L A & Krafft , B A 2018 , ' Size selection of Antarctic krill (Euphausia superba) in a commercial codend and trawl body ' , Fisheries Research , vol. 207 , pp. 49-54 . https://doi.org/10.1016/j.fishres.2018.05.028 |
op_relation |
https://orbit.dtu.dk/en/publications/57cedee6-0b7d-4b5f-8069-71b18585b8c3 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.fishres.2018.05.028 |
container_title |
Fisheries Research |
container_volume |
207 |
container_start_page |
49 |
op_container_end_page |
54 |
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1810486597064327168 |