Using acoustics to estimate the fish-length selectivity of trawl mesh
<qd> Somerton, D. A., Williams, K., von Szalay, P. G., and Rose, C. S. 2011. Using acoustics to estimate the fish-length selectivity of trawl mesh. – ICES Journal of Marine Science, 68: 1558–1565. </qd>Estimation of the retention probability of a trawlnet traditionally involves conductin...
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fthighwire:oai:open-archive.highwire.org:icesjms:68/7/1558 2023-05-15T15:43:52+02:00 Using acoustics to estimate the fish-length selectivity of trawl mesh Somerton, David A. Williams, Kresimir von Szalay, Paul G. Rose, Craig S. 2011-07-01 00:00:00.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/68/7/1558 https://doi.org/10.1093/icesjms/fsr083 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/68/7/1558 http://dx.doi.org/10.1093/icesjms/fsr083 Copyright (C) 2011, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Articles TEXT 2011 fthighwire https://doi.org/10.1093/icesjms/fsr083 2011-07-01T20:56:05Z <qd> Somerton, D. A., Williams, K., von Szalay, P. G., and Rose, C. S. 2011. Using acoustics to estimate the fish-length selectivity of trawl mesh. – ICES Journal of Marine Science, 68: 1558–1565. </qd>Estimation of the retention probability of a trawlnet traditionally involves conducting experiments during which the fish escaping through the meshes are recaptured using either small-mesh pocketnets attached to the outside of the net or by enclosing the entire trawlnet in a small-mesh net. A new method of estimating the length selectivity of trawl mesh is demonstrated; it does not require the recapture of escaping fish but instead uses standard acoustic methods to estimate the abundance of fish entering the net before mesh selection. The method was applied to the 83–112 eastern otter trawl used by the Alaska Fisheries Science Center (AFSC) to conduct bottom-trawl surveys in the eastern Bering Sea (EBS), and the Aleutian wing trawl used by the AFSC to collect midwater biological samples of walleye pollock ( Theragra chalcogramma ) during fishery acoustic surveys of the EBS and Gulf of Alaska. The length selectivities of both trawls were also estimated using standard recapture experiments. For both, the estimated lengths at 50% selection ( L 50 ) from the acoustic method were similar to the estimates from the recapture experiments, but the estimated selection ranges were narrower. The advantages of the acoustic method are that it is simpler to use than traditional fish-recapture methods and it does not alter normal trawl performance. Text Bering Sea Theragra chalcogramma Alaska HighWire Press (Stanford University) Bering Sea Gulf of Alaska ICES Journal of Marine Science 68 7 1558 1565 |
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HighWire Press (Stanford University) |
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English |
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Articles Somerton, David A. Williams, Kresimir von Szalay, Paul G. Rose, Craig S. Using acoustics to estimate the fish-length selectivity of trawl mesh |
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description |
<qd> Somerton, D. A., Williams, K., von Szalay, P. G., and Rose, C. S. 2011. Using acoustics to estimate the fish-length selectivity of trawl mesh. – ICES Journal of Marine Science, 68: 1558–1565. </qd>Estimation of the retention probability of a trawlnet traditionally involves conducting experiments during which the fish escaping through the meshes are recaptured using either small-mesh pocketnets attached to the outside of the net or by enclosing the entire trawlnet in a small-mesh net. A new method of estimating the length selectivity of trawl mesh is demonstrated; it does not require the recapture of escaping fish but instead uses standard acoustic methods to estimate the abundance of fish entering the net before mesh selection. The method was applied to the 83–112 eastern otter trawl used by the Alaska Fisheries Science Center (AFSC) to conduct bottom-trawl surveys in the eastern Bering Sea (EBS), and the Aleutian wing trawl used by the AFSC to collect midwater biological samples of walleye pollock ( Theragra chalcogramma ) during fishery acoustic surveys of the EBS and Gulf of Alaska. The length selectivities of both trawls were also estimated using standard recapture experiments. For both, the estimated lengths at 50% selection ( L 50 ) from the acoustic method were similar to the estimates from the recapture experiments, but the estimated selection ranges were narrower. The advantages of the acoustic method are that it is simpler to use than traditional fish-recapture methods and it does not alter normal trawl performance. |
format |
Text |
author |
Somerton, David A. Williams, Kresimir von Szalay, Paul G. Rose, Craig S. |
author_facet |
Somerton, David A. Williams, Kresimir von Szalay, Paul G. Rose, Craig S. |
author_sort |
Somerton, David A. |
title |
Using acoustics to estimate the fish-length selectivity of trawl mesh |
title_short |
Using acoustics to estimate the fish-length selectivity of trawl mesh |
title_full |
Using acoustics to estimate the fish-length selectivity of trawl mesh |
title_fullStr |
Using acoustics to estimate the fish-length selectivity of trawl mesh |
title_full_unstemmed |
Using acoustics to estimate the fish-length selectivity of trawl mesh |
title_sort |
using acoustics to estimate the fish-length selectivity of trawl mesh |
publisher |
Oxford University Press |
publishDate |
2011 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/68/7/1558 https://doi.org/10.1093/icesjms/fsr083 |
geographic |
Bering Sea Gulf of Alaska |
geographic_facet |
Bering Sea Gulf of Alaska |
genre |
Bering Sea Theragra chalcogramma Alaska |
genre_facet |
Bering Sea Theragra chalcogramma Alaska |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/68/7/1558 http://dx.doi.org/10.1093/icesjms/fsr083 |
op_rights |
Copyright (C) 2011, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1093/icesjms/fsr083 |
container_title |
ICES Journal of Marine Science |
container_volume |
68 |
container_issue |
7 |
container_start_page |
1558 |
op_container_end_page |
1565 |
_version_ |
1766378073695977472 |