Can the precision of bottom trawl indices be increased by using simultaneously collected acoustic data? The Barents Sea experience
Acoustic data are recorded continuously during the winter survey for demersal fish in the Barents Sea. This paper presents a method for using the information from the acoustic recordings between trawl stations in an attempt to increase the precision of the trawl estimate. The method is related to th...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | Norwegian Bokmål |
Published: |
NRC Canada
2007
|
Subjects: | |
Online Access: | http://hdl.handle.net/11250/108282 https://doi.org/10.1139/F07-101 |
id |
ftimr:oai:imr.brage.unit.no:11250/108282 |
---|---|
record_format |
openpolar |
spelling |
ftimr:oai:imr.brage.unit.no:11250/108282 2023-05-15T15:38:28+02:00 Can the precision of bottom trawl indices be increased by using simultaneously collected acoustic data? The Barents Sea experience Hjellvik, Vidar Tjøstheim, Dag Godø, Olav Rune 2007-12 994833 bytes application/pdf http://hdl.handle.net/11250/108282 https://doi.org/10.1139/F07-101 nob nob NRC Canada http://hdl.handle.net/11250/108282 http://dx.doi.org/10.1139/F07-101 1390-1402 64 Canadian Journal of Fisheries and Aquatic Sciences 10 acoustics demersal fish bunnfisk akustikk Journal article Peer reviewed 2007 ftimr https://doi.org/10.1139/F07-101 2021-09-23T20:14:56Z Acoustic data are recorded continuously during the winter survey for demersal fish in the Barents Sea. This paper presents a method for using the information from the acoustic recordings between trawl stations in an attempt to increase the precision of the trawl estimate. The method is related to the double-sampling regression estimation, in which information from a frequently sampled auxiliary variable (e.g., acoustics) that is correlated with the main variable (e.g., trawl) is used for the purpose of increasing the precision in the estimate of the population mean of the main variable. The version presented here allows for additional explanatory variables and for autocorrelation in the main and auxiliary variables. However, when applied to the Barents Sea data, only a minor variance reduction is obtained. The main reasons for this are a high autocorrelation in the acoustic data and a relatively low correlation between trawl and acoustics on trawl stations. Another unexpected result is that the acoustic density during trawling is significantly higher than between trawl stations. Article in Journal/Newspaper Barents Sea Institute for Marine Research: Brage IMR Barents Sea Canadian Journal of Fisheries and Aquatic Sciences 64 10 1390 1402 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
Norwegian Bokmål |
topic |
acoustics demersal fish bunnfisk akustikk |
spellingShingle |
acoustics demersal fish bunnfisk akustikk Hjellvik, Vidar Tjøstheim, Dag Godø, Olav Rune Can the precision of bottom trawl indices be increased by using simultaneously collected acoustic data? The Barents Sea experience |
topic_facet |
acoustics demersal fish bunnfisk akustikk |
description |
Acoustic data are recorded continuously during the winter survey for demersal fish in the Barents Sea. This paper presents a method for using the information from the acoustic recordings between trawl stations in an attempt to increase the precision of the trawl estimate. The method is related to the double-sampling regression estimation, in which information from a frequently sampled auxiliary variable (e.g., acoustics) that is correlated with the main variable (e.g., trawl) is used for the purpose of increasing the precision in the estimate of the population mean of the main variable. The version presented here allows for additional explanatory variables and for autocorrelation in the main and auxiliary variables. However, when applied to the Barents Sea data, only a minor variance reduction is obtained. The main reasons for this are a high autocorrelation in the acoustic data and a relatively low correlation between trawl and acoustics on trawl stations. Another unexpected result is that the acoustic density during trawling is significantly higher than between trawl stations. |
format |
Article in Journal/Newspaper |
author |
Hjellvik, Vidar Tjøstheim, Dag Godø, Olav Rune |
author_facet |
Hjellvik, Vidar Tjøstheim, Dag Godø, Olav Rune |
author_sort |
Hjellvik, Vidar |
title |
Can the precision of bottom trawl indices be increased by using simultaneously collected acoustic data? The Barents Sea experience |
title_short |
Can the precision of bottom trawl indices be increased by using simultaneously collected acoustic data? The Barents Sea experience |
title_full |
Can the precision of bottom trawl indices be increased by using simultaneously collected acoustic data? The Barents Sea experience |
title_fullStr |
Can the precision of bottom trawl indices be increased by using simultaneously collected acoustic data? The Barents Sea experience |
title_full_unstemmed |
Can the precision of bottom trawl indices be increased by using simultaneously collected acoustic data? The Barents Sea experience |
title_sort |
can the precision of bottom trawl indices be increased by using simultaneously collected acoustic data? the barents sea experience |
publisher |
NRC Canada |
publishDate |
2007 |
url |
http://hdl.handle.net/11250/108282 https://doi.org/10.1139/F07-101 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea |
genre_facet |
Barents Sea |
op_source |
1390-1402 64 Canadian Journal of Fisheries and Aquatic Sciences 10 |
op_relation |
http://hdl.handle.net/11250/108282 http://dx.doi.org/10.1139/F07-101 |
op_doi |
https://doi.org/10.1139/F07-101 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
64 |
container_issue |
10 |
container_start_page |
1390 |
op_container_end_page |
1402 |
_version_ |
1766369421602848768 |