The development and evaluation of a three-dimensional, echo-integration method for estimating fish-school abundance
<qd> Nishimori, Y., Iida, K., Furusawa, M., Tang, Y., Tokuyama, K., Nagai, S., and Nishiyama, Y. 2009. The development and evaluation of a three-dimensional, echo-integration method for estimating fish-school abundance. – ICES Journal of Marine Science, 66: 000–000. </qd>A three-dimensio...
Published in: | ICES Journal of Marine Science |
---|---|
Main Authors: | , , , , , , |
Format: | Text |
Language: | English |
Published: |
Oxford University Press
2009
|
Subjects: | |
Online Access: | http://icesjms.oxfordjournals.org/cgi/content/short/fsp053v1 https://doi.org/10.1093/icesjms/fsp053 |
id |
fthighwire:oai:open-archive.highwire.org:icesjms:fsp053v1 |
---|---|
record_format |
openpolar |
spelling |
fthighwire:oai:open-archive.highwire.org:icesjms:fsp053v1 2023-05-15T17:47:06+02:00 The development and evaluation of a three-dimensional, echo-integration method for estimating fish-school abundance Nishimori, Yasushi Iida, Kohji Furusawa, Masahiko Tang, Yong Tokuyama, Kozo Nagai, Sanae Nishiyama, Yoshihiro 2009-03-28 03:33:26.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/fsp053v1 https://doi.org/10.1093/icesjms/fsp053 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/fsp053v1 http://dx.doi.org/10.1093/icesjms/fsp053 Copyright (C) 2009, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer SEAFACTS TEXT 2009 fthighwire https://doi.org/10.1093/icesjms/fsp053 2013-05-26T22:25:54Z <qd> Nishimori, Y., Iida, K., Furusawa, M., Tang, Y., Tokuyama, K., Nagai, S., and Nishiyama, Y. 2009. The development and evaluation of a three-dimensional, echo-integration method for estimating fish-school abundance. – ICES Journal of Marine Science, 66: 000–000. </qd>A three-dimensional, echo-integration method (3DEI) which uses scanning-sonar observations of a fish school to estimate its backscattering cross section ( σ bss = Nσ bs ) was developed. Coupled with a modelled estimate of the average backscattering cross section of individual fish ( σ bs ), the 3DEI theoretically allows estimation of the number of fish in a school ( N ). To test the practicality of the method, measurements were made of a metal sphere simulating fish, and several spheres simulating a fish school. The 3DEI correctly measured the σ bss of each target. Next, the 3DEI was applied to echo data from a herring school in the Norwegian Sea, to estimate its σ bss . Several values of σ bs were estimated with a prolate-spheroid model, each assuming different distributions of fish orientations relative to the sonar beam. Dividing the 3DEI-estimated σ bss by these modelled σ bs shows that the resulting estimates of N were closer to the skipper's estimate than those estimated using the apparent school volume. The 3DEI measurements of σ bss , modelled σ bs , and resulting accuracy of N depend largely on the assumed orientations of the fish relative to the acoustic beam. Text Norwegian Sea HighWire Press (Stanford University) Norwegian Sea ICES Journal of Marine Science 66 6 1037 1042 |
institution |
Open Polar |
collection |
HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
SEAFACTS |
spellingShingle |
SEAFACTS Nishimori, Yasushi Iida, Kohji Furusawa, Masahiko Tang, Yong Tokuyama, Kozo Nagai, Sanae Nishiyama, Yoshihiro The development and evaluation of a three-dimensional, echo-integration method for estimating fish-school abundance |
topic_facet |
SEAFACTS |
description |
<qd> Nishimori, Y., Iida, K., Furusawa, M., Tang, Y., Tokuyama, K., Nagai, S., and Nishiyama, Y. 2009. The development and evaluation of a three-dimensional, echo-integration method for estimating fish-school abundance. – ICES Journal of Marine Science, 66: 000–000. </qd>A three-dimensional, echo-integration method (3DEI) which uses scanning-sonar observations of a fish school to estimate its backscattering cross section ( σ bss = Nσ bs ) was developed. Coupled with a modelled estimate of the average backscattering cross section of individual fish ( σ bs ), the 3DEI theoretically allows estimation of the number of fish in a school ( N ). To test the practicality of the method, measurements were made of a metal sphere simulating fish, and several spheres simulating a fish school. The 3DEI correctly measured the σ bss of each target. Next, the 3DEI was applied to echo data from a herring school in the Norwegian Sea, to estimate its σ bss . Several values of σ bs were estimated with a prolate-spheroid model, each assuming different distributions of fish orientations relative to the sonar beam. Dividing the 3DEI-estimated σ bss by these modelled σ bs shows that the resulting estimates of N were closer to the skipper's estimate than those estimated using the apparent school volume. The 3DEI measurements of σ bss , modelled σ bs , and resulting accuracy of N depend largely on the assumed orientations of the fish relative to the acoustic beam. |
format |
Text |
author |
Nishimori, Yasushi Iida, Kohji Furusawa, Masahiko Tang, Yong Tokuyama, Kozo Nagai, Sanae Nishiyama, Yoshihiro |
author_facet |
Nishimori, Yasushi Iida, Kohji Furusawa, Masahiko Tang, Yong Tokuyama, Kozo Nagai, Sanae Nishiyama, Yoshihiro |
author_sort |
Nishimori, Yasushi |
title |
The development and evaluation of a three-dimensional, echo-integration method for estimating fish-school abundance |
title_short |
The development and evaluation of a three-dimensional, echo-integration method for estimating fish-school abundance |
title_full |
The development and evaluation of a three-dimensional, echo-integration method for estimating fish-school abundance |
title_fullStr |
The development and evaluation of a three-dimensional, echo-integration method for estimating fish-school abundance |
title_full_unstemmed |
The development and evaluation of a three-dimensional, echo-integration method for estimating fish-school abundance |
title_sort |
development and evaluation of a three-dimensional, echo-integration method for estimating fish-school abundance |
publisher |
Oxford University Press |
publishDate |
2009 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/fsp053v1 https://doi.org/10.1093/icesjms/fsp053 |
geographic |
Norwegian Sea |
geographic_facet |
Norwegian Sea |
genre |
Norwegian Sea |
genre_facet |
Norwegian Sea |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/fsp053v1 http://dx.doi.org/10.1093/icesjms/fsp053 |
op_rights |
Copyright (C) 2009, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1093/icesjms/fsp053 |
container_title |
ICES Journal of Marine Science |
container_volume |
66 |
container_issue |
6 |
container_start_page |
1037 |
op_container_end_page |
1042 |
_version_ |
1766151422002331648 |