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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ftaquaticcommons:oai:generic.eprints.org:15245 2023-05-15T15:38:38+02:00 The measurement error in marine survey catches: the bottom trawl case Hjellvik, Vidar Godo, Olav Rune Tjostheim, Dag 2002 application/pdf http://aquaticcommons.org/15245/ http://fishbull.noaa.gov/1004/07hjellv.pdf http://aquaticcommons.org/15245/1/07hjellv.pdf en eng http://aquaticcommons.org/15245/1/07hjellv.pdf Hjellvik, Vidar and Godo, Olav Rune and Tjostheim, Dag (2002) The measurement error in marine survey catches: the bottom trawl case. Fishery Bulletin, 100(4), pp. 720-726. Fisheries Management Article PeerReviewed 2002 ftaquaticcommons 2020-02-27T09:26:55Z 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 International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons Barents Sea |
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Open Polar |
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International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons |
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ftaquaticcommons |
language |
English |
topic |
Fisheries Management |
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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://aquaticcommons.org/15245/ http://fishbull.noaa.gov/1004/07hjellv.pdf http://aquaticcommons.org/15245/1/07hjellv.pdf |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea Gadus morhua |
genre_facet |
Barents Sea Gadus morhua |
op_relation |
http://aquaticcommons.org/15245/1/07hjellv.pdf Hjellvik, Vidar and Godo, Olav Rune and Tjostheim, Dag (2002) The measurement error in marine survey catches: the bottom trawl case. Fishery Bulletin, 100(4), pp. 720-726. |
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1766369825388494848 |