Investigating density-dependent catchability in bottom-trawl surveys
The relationship between density of groundfish in the area swept by a trawl and the catchability was explored. We studied Norwegian and Canadian underwater video observations of cod ( Gadus morhua ), haddock ( Melanogrammus aeglefinis ), and American plaice ( Hippoglossoides platessoides ) in the mo...
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Oxford University Press
1999
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Online Access: | http://icesjms.oxfordjournals.org/cgi/content/short/56/3/292 https://doi.org/10.1006/jmsc.1999.0444 |
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fthighwire:oai:open-archive.highwire.org:icesjms:56/3/292 2023-05-15T16:19:03+02:00 Investigating density-dependent catchability in bottom-trawl surveys Godø, O. R. Walsh, S. J. Engås, A. 1999-06-01 00:00:00.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/56/3/292 https://doi.org/10.1006/jmsc.1999.0444 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/56/3/292 http://dx.doi.org/10.1006/jmsc.1999.0444 Copyright (C) 1999, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Articles TEXT 1999 fthighwire https://doi.org/10.1006/jmsc.1999.0444 2013-05-27T05:24:57Z The relationship between density of groundfish in the area swept by a trawl and the catchability was explored. We studied Norwegian and Canadian underwater video observations of cod ( Gadus morhua ), haddock ( Melanogrammus aeglefinis ), and American plaice ( Hippoglossoides platessoides ) in the mouth of bottom-survey trawls and found that there were qualitative differences in escapement and capture behaviour at various densities. Based on these observations, available data from trawl efficiency experiments carried out in both regions were analysed to look for density effects on catchability. For both areas and all species examined, video and trawl efficiency experiments support the hypothesis that the density of fish ahead of the bottom-trawl affects catchability. Text Gadus morhua HighWire Press (Stanford University) ICES Journal of Marine Science 56 3 292 298 |
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HighWire Press (Stanford University) |
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English |
topic |
Articles |
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Articles Godø, O. R. Walsh, S. J. Engås, A. Investigating density-dependent catchability in bottom-trawl surveys |
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Articles |
description |
The relationship between density of groundfish in the area swept by a trawl and the catchability was explored. We studied Norwegian and Canadian underwater video observations of cod ( Gadus morhua ), haddock ( Melanogrammus aeglefinis ), and American plaice ( Hippoglossoides platessoides ) in the mouth of bottom-survey trawls and found that there were qualitative differences in escapement and capture behaviour at various densities. Based on these observations, available data from trawl efficiency experiments carried out in both regions were analysed to look for density effects on catchability. For both areas and all species examined, video and trawl efficiency experiments support the hypothesis that the density of fish ahead of the bottom-trawl affects catchability. |
format |
Text |
author |
Godø, O. R. Walsh, S. J. Engås, A. |
author_facet |
Godø, O. R. Walsh, S. J. Engås, A. |
author_sort |
Godø, O. R. |
title |
Investigating density-dependent catchability in bottom-trawl surveys |
title_short |
Investigating density-dependent catchability in bottom-trawl surveys |
title_full |
Investigating density-dependent catchability in bottom-trawl surveys |
title_fullStr |
Investigating density-dependent catchability in bottom-trawl surveys |
title_full_unstemmed |
Investigating density-dependent catchability in bottom-trawl surveys |
title_sort |
investigating density-dependent catchability in bottom-trawl surveys |
publisher |
Oxford University Press |
publishDate |
1999 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/56/3/292 https://doi.org/10.1006/jmsc.1999.0444 |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/56/3/292 http://dx.doi.org/10.1006/jmsc.1999.0444 |
op_rights |
Copyright (C) 1999, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1006/jmsc.1999.0444 |
container_title |
ICES Journal of Marine Science |
container_volume |
56 |
container_issue |
3 |
container_start_page |
292 |
op_container_end_page |
298 |
_version_ |
1766005368190664704 |