The measurement error in marine survey catches: the bottom trawl case
We have formulated a model for analyzing the measurement error in marine survey abundance estimates by using data from parallel surveys (trawl haul or acoustic measurement). The measurement error is defined as the component of the variability that cannot be explained by covariates such as temperatur...
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ftoceandocs:oai:aquadocs.org:1834/31097 2023-05-15T15:38:39+02:00 The measurement error in marine survey catches: the bottom trawl case Hjellvik, Vidar Godo, Olav Rune Tjostheim, Dag 2002 application/pdf 720-726 http://hdl.handle.net/1834/31097 en eng http://fishbull.noaa.gov/1004/07hjellv.pdf 0090-0656 http://hdl.handle.net/1834/31097 http://aquaticcommons.org/id/eprint/15245 403 2014-05-30 21:17:41 15245 United States National Marine Fisheries Service Fisheries Management article TRUE 2002 ftoceandocs 2023-04-06T17:04:19Z We have formulated a model for analyzing the measurement error in marine survey abundance estimates by using data from parallel surveys (trawl haul or acoustic measurement). The measurement error is defined as the component of the variability that cannot be explained by covariates such as temperature, depth, bottom type, etc. The method presented is general, but we concentrate on bottom trawl catches of cod (Gadus morhua). Catches of cod from 10 parallel trawling experiments in the Barents Sea with a total of 130 paired hauls were used to estimate the measurement error in trawl hauls. Based on the experimental data, the measurement error is fairly constant in size on the logarithmic scale and is independent of location, time, and fish density. Compared with the total variability of the winter and autumn surveys in the Barents Sea, the measurement error is small (approximately 2–5%, on the log scale, in terms of variance of catch per towed distance). Thus, the cod catch rate is a fairly precise measure of fish density at a given site at a given time. Article in Journal/Newspaper Barents Sea Gadus morhua IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications Barents Sea |
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IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
op_collection_id |
ftoceandocs |
language |
English |
topic |
Fisheries Management |
spellingShingle |
Fisheries Management Hjellvik, Vidar Godo, Olav Rune Tjostheim, Dag The measurement error in marine survey catches: the bottom trawl case |
topic_facet |
Fisheries Management |
description |
We have formulated a model for analyzing the measurement error in marine survey abundance estimates by using data from parallel surveys (trawl haul or acoustic measurement). The measurement error is defined as the component of the variability that cannot be explained by covariates such as temperature, depth, bottom type, etc. The method presented is general, but we concentrate on bottom trawl catches of cod (Gadus morhua). Catches of cod from 10 parallel trawling experiments in the Barents Sea with a total of 130 paired hauls were used to estimate the measurement error in trawl hauls. Based on the experimental data, the measurement error is fairly constant in size on the logarithmic scale and is independent of location, time, and fish density. Compared with the total variability of the winter and autumn surveys in the Barents Sea, the measurement error is small (approximately 2–5%, on the log scale, in terms of variance of catch per towed distance). Thus, the cod catch rate is a fairly precise measure of fish density at a given site at a given time. |
format |
Article in Journal/Newspaper |
author |
Hjellvik, Vidar Godo, Olav Rune Tjostheim, Dag |
author_facet |
Hjellvik, Vidar Godo, Olav Rune Tjostheim, Dag |
author_sort |
Hjellvik, Vidar |
title |
The measurement error in marine survey catches: the bottom trawl case |
title_short |
The measurement error in marine survey catches: the bottom trawl case |
title_full |
The measurement error in marine survey catches: the bottom trawl case |
title_fullStr |
The measurement error in marine survey catches: the bottom trawl case |
title_full_unstemmed |
The measurement error in marine survey catches: the bottom trawl case |
title_sort |
measurement error in marine survey catches: the bottom trawl case |
publishDate |
2002 |
url |
http://hdl.handle.net/1834/31097 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea Gadus morhua |
genre_facet |
Barents Sea Gadus morhua |
op_source |
http://aquaticcommons.org/id/eprint/15245 403 2014-05-30 21:17:41 15245 United States National Marine Fisheries Service |
op_relation |
http://fishbull.noaa.gov/1004/07hjellv.pdf 0090-0656 http://hdl.handle.net/1834/31097 |
_version_ |
1766369831135739904 |