The relative frequency response derived from individually separated targets of northeast Arctic cod (Gadus morhua), saithe (Pollachius virens), and Norway pout (Trisopterus esmarkii)
<qd> Pedersen, G., and Korneliussen, R. J. 2009. The relative frequency response derived from individually separated targets of northeast Arctic cod ( Gadus morhua ), saithe ( Pollachius virens ), and Norway pout ( Trisopterus esmarkii ). – ICES Journal of Marine Science, 66: 000–000. </qd&...
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fthighwire:oai:open-archive.highwire.org:icesjms:fsp070v1 2023-05-15T14:30:19+02:00 The relative frequency response derived from individually separated targets of northeast Arctic cod (Gadus morhua), saithe (Pollachius virens), and Norway pout (Trisopterus esmarkii) Pedersen, Geir Korneliussen, Rolf J. 2009-04-02 02:29:57.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/fsp070v1 https://doi.org/10.1093/icesjms/fsp070 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/fsp070v1 http://dx.doi.org/10.1093/icesjms/fsp070 Copyright (C) 2009, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer SEAFACTS TEXT 2009 fthighwire https://doi.org/10.1093/icesjms/fsp070 2013-05-26T22:25:54Z <qd> Pedersen, G., and Korneliussen, R. J. 2009. The relative frequency response derived from individually separated targets of northeast Arctic cod ( Gadus morhua ), saithe ( Pollachius virens ), and Norway pout ( Trisopterus esmarkii ). – ICES Journal of Marine Science, 66: 000–000. </qd>The concept of relative frequency response r ( f ) of fish is an important feature used to characterize acoustic targets. It is defined as the volume-backscattering coefficient at a specific frequency f relative to that of a reference frequency. When based on volume backscattering, r ( f ) reliably distinguishes several acoustic categories if the insonified volumes are reasonably comparable between the frequencies, and that enough samples and targets are measured to constrain stochastic variations in the data within acceptable limits. Therefore, r ( f ) distinguishes different fish species with swimbladders poorly if they appear as single targets. Using target-strength ( TS ) data, the acoustic measurements are more spatially comparable, and averaging the TS over an echotrace of a single fish improves the ability to distinguish between different species. Frequency response was estimated using TS data from in situ measurements, collected using Simrad EK60 echosounders with split-beam transducers transmitting simultaneously at 18, 38, 70, 120, and 200 kHz. Selected series with nearly pure catches of northeast Arctic cod ( Gadus morhua ), saithe ( Pollachius virens ), and Norway pout ( Trisopterus esmarkii ) were analysed using a target-tracking algorithm. The frequency response of northeast Arctic cod and saithe did not differ significantly, but at high frequencies, the response of both northeast Arctic cod and saithe differed from that of Norway pout. However, in the latter case, northeast Arctic cod and saithe could be separated, because of their different TS magnitudes. Text Arctic cod Arctic Gadus morhua Northeast Arctic cod HighWire Press (Stanford University) Arctic Norway Pedersen ENVELOPE(140.013,140.013,-66.668,-66.668) ICES Journal of Marine Science 66 6 1149 1154 |
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Open Polar |
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HighWire Press (Stanford University) |
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fthighwire |
language |
English |
topic |
SEAFACTS |
spellingShingle |
SEAFACTS Pedersen, Geir Korneliussen, Rolf J. The relative frequency response derived from individually separated targets of northeast Arctic cod (Gadus morhua), saithe (Pollachius virens), and Norway pout (Trisopterus esmarkii) |
topic_facet |
SEAFACTS |
description |
<qd> Pedersen, G., and Korneliussen, R. J. 2009. The relative frequency response derived from individually separated targets of northeast Arctic cod ( Gadus morhua ), saithe ( Pollachius virens ), and Norway pout ( Trisopterus esmarkii ). – ICES Journal of Marine Science, 66: 000–000. </qd>The concept of relative frequency response r ( f ) of fish is an important feature used to characterize acoustic targets. It is defined as the volume-backscattering coefficient at a specific frequency f relative to that of a reference frequency. When based on volume backscattering, r ( f ) reliably distinguishes several acoustic categories if the insonified volumes are reasonably comparable between the frequencies, and that enough samples and targets are measured to constrain stochastic variations in the data within acceptable limits. Therefore, r ( f ) distinguishes different fish species with swimbladders poorly if they appear as single targets. Using target-strength ( TS ) data, the acoustic measurements are more spatially comparable, and averaging the TS over an echotrace of a single fish improves the ability to distinguish between different species. Frequency response was estimated using TS data from in situ measurements, collected using Simrad EK60 echosounders with split-beam transducers transmitting simultaneously at 18, 38, 70, 120, and 200 kHz. Selected series with nearly pure catches of northeast Arctic cod ( Gadus morhua ), saithe ( Pollachius virens ), and Norway pout ( Trisopterus esmarkii ) were analysed using a target-tracking algorithm. The frequency response of northeast Arctic cod and saithe did not differ significantly, but at high frequencies, the response of both northeast Arctic cod and saithe differed from that of Norway pout. However, in the latter case, northeast Arctic cod and saithe could be separated, because of their different TS magnitudes. |
format |
Text |
author |
Pedersen, Geir Korneliussen, Rolf J. |
author_facet |
Pedersen, Geir Korneliussen, Rolf J. |
author_sort |
Pedersen, Geir |
title |
The relative frequency response derived from individually separated targets of northeast Arctic cod (Gadus morhua), saithe (Pollachius virens), and Norway pout (Trisopterus esmarkii) |
title_short |
The relative frequency response derived from individually separated targets of northeast Arctic cod (Gadus morhua), saithe (Pollachius virens), and Norway pout (Trisopterus esmarkii) |
title_full |
The relative frequency response derived from individually separated targets of northeast Arctic cod (Gadus morhua), saithe (Pollachius virens), and Norway pout (Trisopterus esmarkii) |
title_fullStr |
The relative frequency response derived from individually separated targets of northeast Arctic cod (Gadus morhua), saithe (Pollachius virens), and Norway pout (Trisopterus esmarkii) |
title_full_unstemmed |
The relative frequency response derived from individually separated targets of northeast Arctic cod (Gadus morhua), saithe (Pollachius virens), and Norway pout (Trisopterus esmarkii) |
title_sort |
relative frequency response derived from individually separated targets of northeast arctic cod (gadus morhua), saithe (pollachius virens), and norway pout (trisopterus esmarkii) |
publisher |
Oxford University Press |
publishDate |
2009 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/fsp070v1 https://doi.org/10.1093/icesjms/fsp070 |
long_lat |
ENVELOPE(140.013,140.013,-66.668,-66.668) |
geographic |
Arctic Norway Pedersen |
geographic_facet |
Arctic Norway Pedersen |
genre |
Arctic cod Arctic Gadus morhua Northeast Arctic cod |
genre_facet |
Arctic cod Arctic Gadus morhua Northeast Arctic cod |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/fsp070v1 http://dx.doi.org/10.1093/icesjms/fsp070 |
op_rights |
Copyright (C) 2009, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1093/icesjms/fsp070 |
container_title |
ICES Journal of Marine Science |
container_volume |
66 |
container_issue |
6 |
container_start_page |
1149 |
op_container_end_page |
1154 |
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1766304170335272960 |