The vertical separation of fish in the aft end of a demersal trawl
Abstract Krag, L. A., Holst, R., and Madsen, N. 2009. The vertical separation of fish in the aft end of a demersal trawl. – ICES Journal of Marine Science, 66: 772–777. Two multi-compartment separator frames were used to study the vertical separation of some commercially important fish species in th...
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsp034 http://academic.oup.com/icesjms/article-pdf/66/4/772/29132374/fsp034.pdf |
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croxfordunivpr:10.1093/icesjms/fsp034 2024-06-09T07:46:05+00:00 The vertical separation of fish in the aft end of a demersal trawl Krag, Ludvig Ahm Holst, René Madsen, Niels 2009 http://dx.doi.org/10.1093/icesjms/fsp034 http://academic.oup.com/icesjms/article-pdf/66/4/772/29132374/fsp034.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 66, issue 4, page 772-777 ISSN 1095-9289 1054-3139 journal-article 2009 croxfordunivpr https://doi.org/10.1093/icesjms/fsp034 2024-05-10T13:13:23Z Abstract Krag, L. A., Holst, R., and Madsen, N. 2009. The vertical separation of fish in the aft end of a demersal trawl. – ICES Journal of Marine Science, 66: 772–777. 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 Oxford University Press ICES Journal of Marine Science 66 4 772 777 |
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Abstract Krag, L. A., Holst, R., and Madsen, N. 2009. The vertical separation of fish in the aft end of a demersal trawl. – ICES Journal of Marine Science, 66: 772–777. 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 |
spellingShingle |
Krag, Ludvig Ahm Holst, René Madsen, Niels The vertical separation of fish in the aft end of a demersal trawl |
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 |
publisher |
Oxford University Press (OUP) |
publishDate |
2009 |
url |
http://dx.doi.org/10.1093/icesjms/fsp034 http://academic.oup.com/icesjms/article-pdf/66/4/772/29132374/fsp034.pdf |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
ICES Journal of Marine Science volume 66, issue 4, page 772-777 ISSN 1095-9289 1054-3139 |
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_ |
1801375832245010432 |