Mesopelagic fish gas bladder elongation, as estimated from wideband acoustic backscattering measurements
Backscattered acoustic energy from a target varies with frequency and carries information about its material properties, size, shape, and orientation. Gas-bearing organisms are strong reflectors of acoustic energy at the commonly used frequencies (∼18–450 kHz) in fishery surveys, but lack of knowled...
Published in: | The Journal of the Acoustical Society of America |
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Online Access: | https://hdl.handle.net/11250/3019034 https://doi.org/10.1121/10.0011742 |
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ftimr:oai:imr.brage.unit.no:11250/3019034 2023-05-15T17:33:43+02:00 Mesopelagic fish gas bladder elongation, as estimated from wideband acoustic backscattering measurements Khodabandeloo, Babak Ona, Egil Pedersen, Geir Korneliussen, Rolf Melle, Webjørn Raunsgård Klevjer, Thor Aleksander 2022 application/pdf https://hdl.handle.net/11250/3019034 https://doi.org/10.1121/10.0011742 eng eng EC/H2020/817669 Havforskningsinstituttet: 15093 Norges forskningsråd: 280546 Journal of the Acoustical Society of America. 2022, 151 (6), 4073-4085. urn:issn:0001-4966 https://hdl.handle.net/11250/3019034 https://doi.org/10.1121/10.0011742 cristin:2045458 4073-4085 151 Journal of the Acoustical Society of America 6 Peer reviewed Journal article 2022 ftimr https://doi.org/10.1121/10.0011742 2022-09-21T22:42:14Z Backscattered acoustic energy from a target varies with frequency and carries information about its material properties, size, shape, and orientation. Gas-bearing organisms are strong reflectors of acoustic energy at the commonly used frequencies (∼18–450 kHz) in fishery surveys, but lack of knowledge of their acoustic properties creates large uncertainties in mesopelagic biomass estimates. Improved knowledge about the volume and elongation (i.e., longest to shortest dimension) of swimbladders of mesopelagic fishes has been identified as an important factor to reduce the overall uncertainties in acoustic survey estimates of mesopelagic biomass. In this paper, a finite element approach was used to model gas-filled objects, revealing the structure of the backscattering, also at frequencies well above the main resonance frequency. Similar scattering features were observed in measured broadband backscattering of several individual mesopelagic organisms. A method is suggested for estimating the elongation of a gas-bubble using these features. The method is applied to the in situ measured wideband (33–380 kHz) target strength (TS) of single mesopelagic gas-bearing organisms from two stations in the North Atlantic (NA) and Norwegian Sea (NS). For the selected targets, the method suggested that the average elongation of gas-bladder at the NA and NS stations are 1.49 ± 0.52 and 2.86 ± 0.50, respectively. publishedVersion Article in Journal/Newspaper North Atlantic Norwegian Sea Institute for Marine Research: Brage IMR Norwegian Sea The Journal of the Acoustical Society of America 151 6 4073 4085 |
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Open Polar |
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Institute for Marine Research: Brage IMR |
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ftimr |
language |
English |
description |
Backscattered acoustic energy from a target varies with frequency and carries information about its material properties, size, shape, and orientation. Gas-bearing organisms are strong reflectors of acoustic energy at the commonly used frequencies (∼18–450 kHz) in fishery surveys, but lack of knowledge of their acoustic properties creates large uncertainties in mesopelagic biomass estimates. Improved knowledge about the volume and elongation (i.e., longest to shortest dimension) of swimbladders of mesopelagic fishes has been identified as an important factor to reduce the overall uncertainties in acoustic survey estimates of mesopelagic biomass. In this paper, a finite element approach was used to model gas-filled objects, revealing the structure of the backscattering, also at frequencies well above the main resonance frequency. Similar scattering features were observed in measured broadband backscattering of several individual mesopelagic organisms. A method is suggested for estimating the elongation of a gas-bubble using these features. The method is applied to the in situ measured wideband (33–380 kHz) target strength (TS) of single mesopelagic gas-bearing organisms from two stations in the North Atlantic (NA) and Norwegian Sea (NS). For the selected targets, the method suggested that the average elongation of gas-bladder at the NA and NS stations are 1.49 ± 0.52 and 2.86 ± 0.50, respectively. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Khodabandeloo, Babak Ona, Egil Pedersen, Geir Korneliussen, Rolf Melle, Webjørn Raunsgård Klevjer, Thor Aleksander |
spellingShingle |
Khodabandeloo, Babak Ona, Egil Pedersen, Geir Korneliussen, Rolf Melle, Webjørn Raunsgård Klevjer, Thor Aleksander Mesopelagic fish gas bladder elongation, as estimated from wideband acoustic backscattering measurements |
author_facet |
Khodabandeloo, Babak Ona, Egil Pedersen, Geir Korneliussen, Rolf Melle, Webjørn Raunsgård Klevjer, Thor Aleksander |
author_sort |
Khodabandeloo, Babak |
title |
Mesopelagic fish gas bladder elongation, as estimated from wideband acoustic backscattering measurements |
title_short |
Mesopelagic fish gas bladder elongation, as estimated from wideband acoustic backscattering measurements |
title_full |
Mesopelagic fish gas bladder elongation, as estimated from wideband acoustic backscattering measurements |
title_fullStr |
Mesopelagic fish gas bladder elongation, as estimated from wideband acoustic backscattering measurements |
title_full_unstemmed |
Mesopelagic fish gas bladder elongation, as estimated from wideband acoustic backscattering measurements |
title_sort |
mesopelagic fish gas bladder elongation, as estimated from wideband acoustic backscattering measurements |
publishDate |
2022 |
url |
https://hdl.handle.net/11250/3019034 https://doi.org/10.1121/10.0011742 |
geographic |
Norwegian Sea |
geographic_facet |
Norwegian Sea |
genre |
North Atlantic Norwegian Sea |
genre_facet |
North Atlantic Norwegian Sea |
op_source |
4073-4085 151 Journal of the Acoustical Society of America 6 |
op_relation |
EC/H2020/817669 Havforskningsinstituttet: 15093 Norges forskningsråd: 280546 Journal of the Acoustical Society of America. 2022, 151 (6), 4073-4085. urn:issn:0001-4966 https://hdl.handle.net/11250/3019034 https://doi.org/10.1121/10.0011742 cristin:2045458 |
op_doi |
https://doi.org/10.1121/10.0011742 |
container_title |
The Journal of the Acoustical Society of America |
container_volume |
151 |
container_issue |
6 |
container_start_page |
4073 |
op_container_end_page |
4085 |
_version_ |
1766132314393280512 |