The measurement error of marine survey catches: the bottom trawl case
We have formulated a model for analyzing the measurement error of marine survey abundance estimates 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,...
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ftimr:oai:imr.brage.unit.no:11250/106175 2023-05-15T15:38:41+02:00 The measurement error of marine survey catches: the bottom trawl case Hjellvik, Vidar Godø, Olav Rune Tjøstheim, Dag 2001 application/pdf http://hdl.handle.net/11250/106175 eng eng ICES ICES CM Documents;2001/P:6 This report is not to be cited without prior reference to the authors http://hdl.handle.net/11250/106175 13 s. cod torsk trawl trål stock assessment bestandsberegning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 VDP::Mathematics and natural science: 400::Mathematics: 410::Analysis: 411 Working paper 2001 ftimr 2021-09-23T20:15:14Z We have formulated a model for analyzing the measurement error of marine survey abundance estimates 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 of 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 fairly precise measure of fish density at a given site at a given time. Report Barents Sea Gadus morhua Institute for Marine Research: Brage IMR Barents Sea |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
cod torsk trawl trål stock assessment bestandsberegning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 VDP::Mathematics and natural science: 400::Mathematics: 410::Analysis: 411 |
spellingShingle |
cod torsk trawl trål stock assessment bestandsberegning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 VDP::Mathematics and natural science: 400::Mathematics: 410::Analysis: 411 Hjellvik, Vidar Godø, Olav Rune Tjøstheim, Dag The measurement error of marine survey catches: the bottom trawl case |
topic_facet |
cod torsk trawl trål stock assessment bestandsberegning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 VDP::Mathematics and natural science: 400::Mathematics: 410::Analysis: 411 |
description |
We have formulated a model for analyzing the measurement error of marine survey abundance estimates 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 of 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 fairly precise measure of fish density at a given site at a given time. |
format |
Report |
author |
Hjellvik, Vidar Godø, Olav Rune Tjøstheim, Dag |
author_facet |
Hjellvik, Vidar Godø, Olav Rune Tjøstheim, Dag |
author_sort |
Hjellvik, Vidar |
title |
The measurement error of marine survey catches: the bottom trawl case |
title_short |
The measurement error of marine survey catches: the bottom trawl case |
title_full |
The measurement error of marine survey catches: the bottom trawl case |
title_fullStr |
The measurement error of marine survey catches: the bottom trawl case |
title_full_unstemmed |
The measurement error of marine survey catches: the bottom trawl case |
title_sort |
measurement error of marine survey catches: the bottom trawl case |
publisher |
ICES |
publishDate |
2001 |
url |
http://hdl.handle.net/11250/106175 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea Gadus morhua |
genre_facet |
Barents Sea Gadus morhua |
op_source |
13 s. |
op_relation |
ICES CM Documents;2001/P:6 This report is not to be cited without prior reference to the authors http://hdl.handle.net/11250/106175 |
_version_ |
1766369928160477184 |