Combining bottom trawls and acoustics in a diverse semipelagic environment: What is the contribution of walleye pollock ( Gadus chalcogrammus) to near-bottom acoustic backscatter in the eastern Bering Sea?
The abundance of walleye pollock (Gadus chalcogrammus) in the eastern Bering Sea is estimated in part through fisheries-independent acoustic trawl (AT) surveys, which currently use acoustic backscatter data down to 3 m above the bottom. A large portion of adult pollock are demersal, and these estima...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Canadian Science Publishing
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Online Access: | http://dx.doi.org/10.1139/cjfas-2015-0481 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2015-0481 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2015-0481 |
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crcansciencepubl:10.1139/cjfas-2015-0481 2024-06-23T07:51:45+00:00 Combining bottom trawls and acoustics in a diverse semipelagic environment: What is the contribution of walleye pollock ( Gadus chalcogrammus) to near-bottom acoustic backscatter in the eastern Bering Sea? Lauffenburger, Nathan De Robertis, Alex Kotwicki, Stan 2017 http://dx.doi.org/10.1139/cjfas-2015-0481 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2015-0481 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2015-0481 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 74, issue 2, page 256-264 ISSN 0706-652X 1205-7533 journal-article 2017 crcansciencepubl https://doi.org/10.1139/cjfas-2015-0481 2024-06-06T04:11:16Z The abundance of walleye pollock (Gadus chalcogrammus) in the eastern Bering Sea is estimated in part through fisheries-independent acoustic trawl (AT) surveys, which currently use acoustic backscatter data down to 3 m above the bottom. A large portion of adult pollock are demersal, and these estimates will become more accurate if the survey is extended closer to bottom. The purpose of this project was to assess the feasibility of extending the AT survey closer to the bottom by estimating the contributions of each demersal fish species to observed acoustic backscatter in the highly diverse near-bottom region. This was accomplished by fitting a regression model to simultaneously collected acoustic backscatter and bottom trawl catch data. Pollock were the dominant source of acoustic backscatter among demersal species, accounting for 85.9% ± 4.8% of acoustic backscatter (mean ± standard deviation). A method was developed to extend the AT survey to within 0.5 m of the bottom, and when applied to the 1994–2014 surveys, pollock biomass increased by a mean of 28% ± 9%. Article in Journal/Newspaper Bering Sea Canadian Science Publishing Bering Sea Canadian Journal of Fisheries and Aquatic Sciences 74 2 256 264 |
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Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
The abundance of walleye pollock (Gadus chalcogrammus) in the eastern Bering Sea is estimated in part through fisheries-independent acoustic trawl (AT) surveys, which currently use acoustic backscatter data down to 3 m above the bottom. A large portion of adult pollock are demersal, and these estimates will become more accurate if the survey is extended closer to bottom. The purpose of this project was to assess the feasibility of extending the AT survey closer to the bottom by estimating the contributions of each demersal fish species to observed acoustic backscatter in the highly diverse near-bottom region. This was accomplished by fitting a regression model to simultaneously collected acoustic backscatter and bottom trawl catch data. Pollock were the dominant source of acoustic backscatter among demersal species, accounting for 85.9% ± 4.8% of acoustic backscatter (mean ± standard deviation). A method was developed to extend the AT survey to within 0.5 m of the bottom, and when applied to the 1994–2014 surveys, pollock biomass increased by a mean of 28% ± 9%. |
format |
Article in Journal/Newspaper |
author |
Lauffenburger, Nathan De Robertis, Alex Kotwicki, Stan |
spellingShingle |
Lauffenburger, Nathan De Robertis, Alex Kotwicki, Stan Combining bottom trawls and acoustics in a diverse semipelagic environment: What is the contribution of walleye pollock ( Gadus chalcogrammus) to near-bottom acoustic backscatter in the eastern Bering Sea? |
author_facet |
Lauffenburger, Nathan De Robertis, Alex Kotwicki, Stan |
author_sort |
Lauffenburger, Nathan |
title |
Combining bottom trawls and acoustics in a diverse semipelagic environment: What is the contribution of walleye pollock ( Gadus chalcogrammus) to near-bottom acoustic backscatter in the eastern Bering Sea? |
title_short |
Combining bottom trawls and acoustics in a diverse semipelagic environment: What is the contribution of walleye pollock ( Gadus chalcogrammus) to near-bottom acoustic backscatter in the eastern Bering Sea? |
title_full |
Combining bottom trawls and acoustics in a diverse semipelagic environment: What is the contribution of walleye pollock ( Gadus chalcogrammus) to near-bottom acoustic backscatter in the eastern Bering Sea? |
title_fullStr |
Combining bottom trawls and acoustics in a diverse semipelagic environment: What is the contribution of walleye pollock ( Gadus chalcogrammus) to near-bottom acoustic backscatter in the eastern Bering Sea? |
title_full_unstemmed |
Combining bottom trawls and acoustics in a diverse semipelagic environment: What is the contribution of walleye pollock ( Gadus chalcogrammus) to near-bottom acoustic backscatter in the eastern Bering Sea? |
title_sort |
combining bottom trawls and acoustics in a diverse semipelagic environment: what is the contribution of walleye pollock ( gadus chalcogrammus) to near-bottom acoustic backscatter in the eastern bering sea? |
publisher |
Canadian Science Publishing |
publishDate |
2017 |
url |
http://dx.doi.org/10.1139/cjfas-2015-0481 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2015-0481 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2015-0481 |
geographic |
Bering Sea |
geographic_facet |
Bering Sea |
genre |
Bering Sea |
genre_facet |
Bering Sea |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 74, issue 2, page 256-264 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjfas-2015-0481 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
74 |
container_issue |
2 |
container_start_page |
256 |
op_container_end_page |
264 |
_version_ |
1802642875231502336 |