Acoustic target strength of capelin measured by single-target tracking in a controlled cage experiment
Knowledge of the acoustic target strength (TS) of capelin, Mallotus villosus (Müller), is important to scale integrator outputs for use in acoustic surveys, but experimental measurements of capelin TS are scarce. This paper reports a new ex situ experiment on capelin TS. Small groups of the fish wer...
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2002
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fthighwire:oai:open-archive.highwire.org:icesjms:59/5/1081 2023-05-15T15:37:26+02:00 Acoustic target strength of capelin measured by single-target tracking in a controlled cage experiment Jørgensen, Roar Olsen, Kjell 2002-01-01 00:00:00.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/59/5/1081 https://doi.org/10.1006/jmsc.2002.1239 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/59/5/1081 http://dx.doi.org/10.1006/jmsc.2002.1239 Copyright (C) 2002, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Regular Articles TEXT 2002 fthighwire https://doi.org/10.1006/jmsc.2002.1239 2013-05-27T03:28:43Z Knowledge of the acoustic target strength (TS) of capelin, Mallotus villosus (Müller), is important to scale integrator outputs for use in acoustic surveys, but experimental measurements of capelin TS are scarce. This paper reports a new ex situ experiment on capelin TS. Small groups of the fish were kept in a large sea cage that allowed them to swim freely between 4.5 and 10 m deep. TS measurements were made vertically with a scientific split-beam echosounder. Differences in behaviour could induce at least a 5 db change in TS owing to changes in tilt angle. The observed mean TS for capelin from the local Balsfjord stock was >1 db higher than expected from the TS–length relationship for Barents Sea capelin used during abundance estimation. Text Balsfjord Barents Sea HighWire Press (Stanford University) Balsfjord ENVELOPE(19.227,19.227,69.240,69.240) Barents Sea ICES Journal of Marine Science 59 5 1081 1085 |
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HighWire Press (Stanford University) |
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English |
topic |
Regular Articles |
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Regular Articles Jørgensen, Roar Olsen, Kjell Acoustic target strength of capelin measured by single-target tracking in a controlled cage experiment |
topic_facet |
Regular Articles |
description |
Knowledge of the acoustic target strength (TS) of capelin, Mallotus villosus (Müller), is important to scale integrator outputs for use in acoustic surveys, but experimental measurements of capelin TS are scarce. This paper reports a new ex situ experiment on capelin TS. Small groups of the fish were kept in a large sea cage that allowed them to swim freely between 4.5 and 10 m deep. TS measurements were made vertically with a scientific split-beam echosounder. Differences in behaviour could induce at least a 5 db change in TS owing to changes in tilt angle. The observed mean TS for capelin from the local Balsfjord stock was >1 db higher than expected from the TS–length relationship for Barents Sea capelin used during abundance estimation. |
format |
Text |
author |
Jørgensen, Roar Olsen, Kjell |
author_facet |
Jørgensen, Roar Olsen, Kjell |
author_sort |
Jørgensen, Roar |
title |
Acoustic target strength of capelin measured by single-target tracking in a controlled cage experiment |
title_short |
Acoustic target strength of capelin measured by single-target tracking in a controlled cage experiment |
title_full |
Acoustic target strength of capelin measured by single-target tracking in a controlled cage experiment |
title_fullStr |
Acoustic target strength of capelin measured by single-target tracking in a controlled cage experiment |
title_full_unstemmed |
Acoustic target strength of capelin measured by single-target tracking in a controlled cage experiment |
title_sort |
acoustic target strength of capelin measured by single-target tracking in a controlled cage experiment |
publisher |
Oxford University Press |
publishDate |
2002 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/59/5/1081 https://doi.org/10.1006/jmsc.2002.1239 |
long_lat |
ENVELOPE(19.227,19.227,69.240,69.240) |
geographic |
Balsfjord Barents Sea |
geographic_facet |
Balsfjord Barents Sea |
genre |
Balsfjord Barents Sea |
genre_facet |
Balsfjord Barents Sea |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/59/5/1081 http://dx.doi.org/10.1006/jmsc.2002.1239 |
op_rights |
Copyright (C) 2002, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1006/jmsc.2002.1239 |
container_title |
ICES Journal of Marine Science |
container_volume |
59 |
container_issue |
5 |
container_start_page |
1081 |
op_container_end_page |
1085 |
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1766367999277662208 |