Target-strength measurements of walleye pollock (Theragra chalcogramma) and Pacific whiting (Merluccius productus)
The importance of knowledge about the target-strength (TS) characteristics of the surveyed fish population to the accuracy of acoustic assessments using echo integration is well known. The most commonly used TS to length (L) relationship for walleye pollock is based on swimbladder morphology measure...
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Oxford University Press
1996
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fthighwire:oai:open-archive.highwire.org:icesjms:53/2/253 2023-05-15T18:32:51+02:00 Target-strength measurements of walleye pollock (Theragra chalcogramma) and Pacific whiting (Merluccius productus) Traynor, Jimmie J. 1996-04-01 00:00:00.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/53/2/253 https://doi.org/10.1006/jmsc.1996.0031 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/53/2/253 http://dx.doi.org/10.1006/jmsc.1996.0031 Copyright (C) 1996, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Regular Articles TEXT 1996 fthighwire https://doi.org/10.1006/jmsc.1996.0031 2013-05-26T13:05:00Z The importance of knowledge about the target-strength (TS) characteristics of the surveyed fish population to the accuracy of acoustic assessments using echo integration is well known. The most commonly used TS to length (L) relationship for walleye pollock is based on swimbladder morphology measurements and in situ TS measurements TS (in dB)=20 log L−66.0 for fish length in centimeters. For Pacific whiting, TS measurements have not been made over an adequate range of fish lengths to determine the appropriate relationship for use in scaling echo-integration surveys. However, results presented in this paper and elsewhere suggest a smaller TS (about 2 dB for a given length) for 40–60 cm fish. Measurements of the TS of walleye pollock and Pacific whiting were made with a SIMRAD EK500 in the present study. The appropriateness of the currently used TS to length relationship for echo integration scaling is discussed for pollock. The application of a TS to length relationship for Pacific whiting is considered. An attempt to use a system with a transducer lowered through the water column to reduce noise-induced bias is described. Text Theragra chalcogramma HighWire Press (Stanford University) Pacific ICES Journal of Marine Science 53 2 253 258 |
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HighWire Press (Stanford University) |
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English |
topic |
Regular Articles |
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Regular Articles Traynor, Jimmie J. Target-strength measurements of walleye pollock (Theragra chalcogramma) and Pacific whiting (Merluccius productus) |
topic_facet |
Regular Articles |
description |
The importance of knowledge about the target-strength (TS) characteristics of the surveyed fish population to the accuracy of acoustic assessments using echo integration is well known. The most commonly used TS to length (L) relationship for walleye pollock is based on swimbladder morphology measurements and in situ TS measurements TS (in dB)=20 log L−66.0 for fish length in centimeters. For Pacific whiting, TS measurements have not been made over an adequate range of fish lengths to determine the appropriate relationship for use in scaling echo-integration surveys. However, results presented in this paper and elsewhere suggest a smaller TS (about 2 dB for a given length) for 40–60 cm fish. Measurements of the TS of walleye pollock and Pacific whiting were made with a SIMRAD EK500 in the present study. The appropriateness of the currently used TS to length relationship for echo integration scaling is discussed for pollock. The application of a TS to length relationship for Pacific whiting is considered. An attempt to use a system with a transducer lowered through the water column to reduce noise-induced bias is described. |
format |
Text |
author |
Traynor, Jimmie J. |
author_facet |
Traynor, Jimmie J. |
author_sort |
Traynor, Jimmie J. |
title |
Target-strength measurements of walleye pollock (Theragra chalcogramma) and Pacific whiting (Merluccius productus) |
title_short |
Target-strength measurements of walleye pollock (Theragra chalcogramma) and Pacific whiting (Merluccius productus) |
title_full |
Target-strength measurements of walleye pollock (Theragra chalcogramma) and Pacific whiting (Merluccius productus) |
title_fullStr |
Target-strength measurements of walleye pollock (Theragra chalcogramma) and Pacific whiting (Merluccius productus) |
title_full_unstemmed |
Target-strength measurements of walleye pollock (Theragra chalcogramma) and Pacific whiting (Merluccius productus) |
title_sort |
target-strength measurements of walleye pollock (theragra chalcogramma) and pacific whiting (merluccius productus) |
publisher |
Oxford University Press |
publishDate |
1996 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/53/2/253 https://doi.org/10.1006/jmsc.1996.0031 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Theragra chalcogramma |
genre_facet |
Theragra chalcogramma |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/53/2/253 http://dx.doi.org/10.1006/jmsc.1996.0031 |
op_rights |
Copyright (C) 1996, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1006/jmsc.1996.0031 |
container_title |
ICES Journal of Marine Science |
container_volume |
53 |
container_issue |
2 |
container_start_page |
253 |
op_container_end_page |
258 |
_version_ |
1766217056413286400 |