The vertical separation of fish in the aft end of a demersal trawl
Two multi-compartment separator frames were used to study the vertical separation of some commercially important fish species in the aft end of a trawl, with the aim of separating cod (Gadus morhua) from other species. A non-linear multinomial model with random effects was used to analyse the data a...
Published in: | ICES Journal of Marine Science |
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Language: | English |
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2009
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Online Access: | https://orbit.dtu.dk/en/publications/42119e03-e14f-4022-bc87-65529163ead9 https://doi.org/10.1093/icesjms/fsp034 |
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ftdtupubl:oai:pure.atira.dk:publications/42119e03-e14f-4022-bc87-65529163ead9 2024-09-15T18:07:18+00:00 The vertical separation of fish in the aft end of a demersal trawl Krag, Ludvig Ahm Holst, René Madsen, Niels 2009 https://orbit.dtu.dk/en/publications/42119e03-e14f-4022-bc87-65529163ead9 https://doi.org/10.1093/icesjms/fsp034 eng eng https://orbit.dtu.dk/en/publications/42119e03-e14f-4022-bc87-65529163ead9 info:eu-repo/semantics/restrictedAccess Krag , L A , Holst , R & Madsen , N 2009 , ' The vertical separation of fish in the aft end of a demersal trawl ' , ICES Journal of Marine Science , vol. 66 , no. 4 , pp. 772-777 . https://doi.org/10.1093/icesjms/fsp034 trawl cod multinomial mixed effects models fish behaviour species selectivity article 2009 ftdtupubl https://doi.org/10.1093/icesjms/fsp034 2024-07-08T23:51:45Z Two multi-compartment separator frames were used to study the vertical separation of some commercially important fish species in the aft end of a trawl, with the aim of separating cod (Gadus morhua) from other species. A non-linear multinomial model with random effects was used to analyse the data and to compare the performance of the two frames. The vertical distribution of cod in the aft end of the trawl was close to uniform, whereas haddock (Melanogrammus aeglefinus), whiting (Merlangius merlangus), plaice (Pleuronectes platessa), and lemon sole (Microstomus kitt) showed more uneven distributions. The use of guiding bars in the separator frame significantly (p <0.05) increased the catch of cod, plaice, and lemon sole in the upper compartment. The vertical separation of cod was density-dependent; high densities of fish resulted in a more uniform distribution of cod. The species separations found differ from those reported from the studies of species separation in the region of the trawl mouth. Article in Journal/Newspaper Gadus morhua Technical University of Denmark: DTU Orbit ICES Journal of Marine Science 66 4 772 777 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
trawl cod multinomial mixed effects models fish behaviour species selectivity |
spellingShingle |
trawl cod multinomial mixed effects models fish behaviour species selectivity Krag, Ludvig Ahm Holst, René Madsen, Niels The vertical separation of fish in the aft end of a demersal trawl |
topic_facet |
trawl cod multinomial mixed effects models fish behaviour species selectivity |
description |
Two multi-compartment separator frames were used to study the vertical separation of some commercially important fish species in the aft end of a trawl, with the aim of separating cod (Gadus morhua) from other species. A non-linear multinomial model with random effects was used to analyse the data and to compare the performance of the two frames. The vertical distribution of cod in the aft end of the trawl was close to uniform, whereas haddock (Melanogrammus aeglefinus), whiting (Merlangius merlangus), plaice (Pleuronectes platessa), and lemon sole (Microstomus kitt) showed more uneven distributions. The use of guiding bars in the separator frame significantly (p <0.05) increased the catch of cod, plaice, and lemon sole in the upper compartment. The vertical separation of cod was density-dependent; high densities of fish resulted in a more uniform distribution of cod. The species separations found differ from those reported from the studies of species separation in the region of the trawl mouth. |
format |
Article in Journal/Newspaper |
author |
Krag, Ludvig Ahm Holst, René Madsen, Niels |
author_facet |
Krag, Ludvig Ahm Holst, René Madsen, Niels |
author_sort |
Krag, Ludvig Ahm |
title |
The vertical separation of fish in the aft end of a demersal trawl |
title_short |
The vertical separation of fish in the aft end of a demersal trawl |
title_full |
The vertical separation of fish in the aft end of a demersal trawl |
title_fullStr |
The vertical separation of fish in the aft end of a demersal trawl |
title_full_unstemmed |
The vertical separation of fish in the aft end of a demersal trawl |
title_sort |
vertical separation of fish in the aft end of a demersal trawl |
publishDate |
2009 |
url |
https://orbit.dtu.dk/en/publications/42119e03-e14f-4022-bc87-65529163ead9 https://doi.org/10.1093/icesjms/fsp034 |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Krag , L A , Holst , R & Madsen , N 2009 , ' The vertical separation of fish in the aft end of a demersal trawl ' , ICES Journal of Marine Science , vol. 66 , no. 4 , pp. 772-777 . https://doi.org/10.1093/icesjms/fsp034 |
op_relation |
https://orbit.dtu.dk/en/publications/42119e03-e14f-4022-bc87-65529163ead9 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1093/icesjms/fsp034 |
container_title |
ICES Journal of Marine Science |
container_volume |
66 |
container_issue |
4 |
container_start_page |
772 |
op_container_end_page |
777 |
_version_ |
1810444683338317824 |