Extinction cross section of herring: New measurements and speculation
Acoustic abundance estimation of dense, vertically extended aggregations of fish requires knowledge of the extinction cross section. An established method based on a comparison of the area backscattering coefficients of fish and underlying flat bottom is exercised for herring in Ofotfjorden, January...
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ftimr:oai:imr.brage.unit.no:11250/105255 2023-05-15T17:52:26+02:00 Extinction cross section of herring: New measurements and speculation Foote, Kenneth G. 1994 application/pdf http://hdl.handle.net/11250/105255 eng eng ICES ICES CM Documents;1994/(B+D+G+H):2 This report is not to be cited without prior reference to the author http://hdl.handle.net/11250/105255 10 s. herring sild acoustics akustikk stock assessment bestandsberegning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 Working paper 1994 ftimr 2021-09-23T20:14:38Z Acoustic abundance estimation of dense, vertically extended aggregations of fish requires knowledge of the extinction cross section. An established method based on a comparison of the area backscattering coefficients of fish and underlying flat bottom is exercised for herring in Ofotfjorden, January 1994, as observed with the SIMRAD EK500/38 kHz scientific echo sounder and Bergen Echo Integrator. Variability in the measurement results both for the present period and with respect to earlier years is viewed in the light of the optical literature. This suggests that the extinction cross section of finite but complicated physical scatterers may be as sensitive to details of orientation as is the backscattering cross section. The possibility of exploiting this property is considered. Report Ofotfjorden Institute for Marine Research: Brage IMR Bergen Ofotfjorden ENVELOPE(17.015,17.015,68.420,68.420) |
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Open Polar |
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Institute for Marine Research: Brage IMR |
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ftimr |
language |
English |
topic |
herring sild acoustics akustikk stock assessment bestandsberegning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 |
spellingShingle |
herring sild acoustics akustikk stock assessment bestandsberegning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 Foote, Kenneth G. Extinction cross section of herring: New measurements and speculation |
topic_facet |
herring sild acoustics akustikk stock assessment bestandsberegning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 |
description |
Acoustic abundance estimation of dense, vertically extended aggregations of fish requires knowledge of the extinction cross section. An established method based on a comparison of the area backscattering coefficients of fish and underlying flat bottom is exercised for herring in Ofotfjorden, January 1994, as observed with the SIMRAD EK500/38 kHz scientific echo sounder and Bergen Echo Integrator. Variability in the measurement results both for the present period and with respect to earlier years is viewed in the light of the optical literature. This suggests that the extinction cross section of finite but complicated physical scatterers may be as sensitive to details of orientation as is the backscattering cross section. The possibility of exploiting this property is considered. |
format |
Report |
author |
Foote, Kenneth G. |
author_facet |
Foote, Kenneth G. |
author_sort |
Foote, Kenneth G. |
title |
Extinction cross section of herring: New measurements and speculation |
title_short |
Extinction cross section of herring: New measurements and speculation |
title_full |
Extinction cross section of herring: New measurements and speculation |
title_fullStr |
Extinction cross section of herring: New measurements and speculation |
title_full_unstemmed |
Extinction cross section of herring: New measurements and speculation |
title_sort |
extinction cross section of herring: new measurements and speculation |
publisher |
ICES |
publishDate |
1994 |
url |
http://hdl.handle.net/11250/105255 |
long_lat |
ENVELOPE(17.015,17.015,68.420,68.420) |
geographic |
Bergen Ofotfjorden |
geographic_facet |
Bergen Ofotfjorden |
genre |
Ofotfjorden |
genre_facet |
Ofotfjorden |
op_source |
10 s. |
op_relation |
ICES CM Documents;1994/(B+D+G+H):2 This report is not to be cited without prior reference to the author http://hdl.handle.net/11250/105255 |
_version_ |
1766159852082561024 |