Mass estimates of individual gas-bearing mesopelagic fish from in situ wideband acoustic measurements ground-truthed by biological net sampling
A new acoustic approach to estimate the mass of individual gas-bearing fish at their resident depth at more than 400 m was tested on Cyclothone spp. Cyclothone are small and slender, and possibly numerically underestimated globally as individuals can pass through trawl meshes. A towed instrumented p...
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Online Access: | https://hdl.handle.net/11250/2975897 https://doi.org/10.1093/icesjms/fsab207 |
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ftimr:oai:imr.brage.unit.no:11250/2975897 2023-05-15T17:41:27+02:00 Mass estimates of individual gas-bearing mesopelagic fish from in situ wideband acoustic measurements ground-truthed by biological net sampling Agersted, Mette Dalgaard Khodabandeloo, Babak Klevjer, Thor A. García-Seoane, Eva Strand, Espen Underwood, Melanie Melle, Webjørn Raunsgård 2021 application/pdf https://hdl.handle.net/11250/2975897 https://doi.org/10.1093/icesjms/fsab207 eng eng Norges forskningsråd: 280546 EC/H2020/817669 ICES Journal of Marine Science. 2021, 78 (10), 3658-3673. urn:issn:1054-3139 https://hdl.handle.net/11250/2975897 https://doi.org/10.1093/icesjms/fsab207 cristin:1945433 3658-3673 78 ICES Journal of Marine Science 10 Peer reviewed Journal article 2021 ftimr https://doi.org/10.1093/icesjms/fsab207 2022-02-02T23:39:40Z A new acoustic approach to estimate the mass of individual gas-bearing fish at their resident depth at more than 400 m was tested on Cyclothone spp. Cyclothone are small and slender, and possibly numerically underestimated globally as individuals can pass through trawl meshes. A towed instrumented platform was used at one sampling station in the Northeast Atlantic, where Cyclothone spp. dominated numerically in net catches, to measure in situ acoustic wideband target strength (TS) spectra, i.e. acoustic scattering response of a given organism (”target”) over a frequency range (here, 38 + 50–260 kHz). Fitting a viscous–elastic scattering model to TS spectra of single targets resulted in swimbladder volume estimates from where individual mass was estimated by assuming neutral buoyancy for a given flesh density, such that fish average density equals that of surrounding water. A density contrast (between fish flesh and seawater) of 1.020 resulted in similar mass–frequency distribution of fish estimated from acoustics/model and Cyclothone spp. caught in nets. The presented proof of concept has the potential to obtain relationships between TS and mass of individual gas-bearing mesopelagic fish in general. publishedVersion Article in Journal/Newspaper Northeast Atlantic Institute for Marine Research: Brage IMR ICES Journal of Marine Science 78 10 3658 3673 |
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Open Polar |
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Institute for Marine Research: Brage IMR |
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English |
description |
A new acoustic approach to estimate the mass of individual gas-bearing fish at their resident depth at more than 400 m was tested on Cyclothone spp. Cyclothone are small and slender, and possibly numerically underestimated globally as individuals can pass through trawl meshes. A towed instrumented platform was used at one sampling station in the Northeast Atlantic, where Cyclothone spp. dominated numerically in net catches, to measure in situ acoustic wideband target strength (TS) spectra, i.e. acoustic scattering response of a given organism (”target”) over a frequency range (here, 38 + 50–260 kHz). Fitting a viscous–elastic scattering model to TS spectra of single targets resulted in swimbladder volume estimates from where individual mass was estimated by assuming neutral buoyancy for a given flesh density, such that fish average density equals that of surrounding water. A density contrast (between fish flesh and seawater) of 1.020 resulted in similar mass–frequency distribution of fish estimated from acoustics/model and Cyclothone spp. caught in nets. The presented proof of concept has the potential to obtain relationships between TS and mass of individual gas-bearing mesopelagic fish in general. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Agersted, Mette Dalgaard Khodabandeloo, Babak Klevjer, Thor A. García-Seoane, Eva Strand, Espen Underwood, Melanie Melle, Webjørn Raunsgård |
spellingShingle |
Agersted, Mette Dalgaard Khodabandeloo, Babak Klevjer, Thor A. García-Seoane, Eva Strand, Espen Underwood, Melanie Melle, Webjørn Raunsgård Mass estimates of individual gas-bearing mesopelagic fish from in situ wideband acoustic measurements ground-truthed by biological net sampling |
author_facet |
Agersted, Mette Dalgaard Khodabandeloo, Babak Klevjer, Thor A. García-Seoane, Eva Strand, Espen Underwood, Melanie Melle, Webjørn Raunsgård |
author_sort |
Agersted, Mette Dalgaard |
title |
Mass estimates of individual gas-bearing mesopelagic fish from in situ wideband acoustic measurements ground-truthed by biological net sampling |
title_short |
Mass estimates of individual gas-bearing mesopelagic fish from in situ wideband acoustic measurements ground-truthed by biological net sampling |
title_full |
Mass estimates of individual gas-bearing mesopelagic fish from in situ wideband acoustic measurements ground-truthed by biological net sampling |
title_fullStr |
Mass estimates of individual gas-bearing mesopelagic fish from in situ wideband acoustic measurements ground-truthed by biological net sampling |
title_full_unstemmed |
Mass estimates of individual gas-bearing mesopelagic fish from in situ wideband acoustic measurements ground-truthed by biological net sampling |
title_sort |
mass estimates of individual gas-bearing mesopelagic fish from in situ wideband acoustic measurements ground-truthed by biological net sampling |
publishDate |
2021 |
url |
https://hdl.handle.net/11250/2975897 https://doi.org/10.1093/icesjms/fsab207 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
3658-3673 78 ICES Journal of Marine Science 10 |
op_relation |
Norges forskningsråd: 280546 EC/H2020/817669 ICES Journal of Marine Science. 2021, 78 (10), 3658-3673. urn:issn:1054-3139 https://hdl.handle.net/11250/2975897 https://doi.org/10.1093/icesjms/fsab207 cristin:1945433 |
op_doi |
https://doi.org/10.1093/icesjms/fsab207 |
container_title |
ICES Journal of Marine Science |
container_volume |
78 |
container_issue |
10 |
container_start_page |
3658 |
op_container_end_page |
3673 |
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1766143011766403072 |