Acoustic characteristics of forage fish species in the Gulf of Alaska and Bering Sea based on Kirchhoff-approximation models
Acoustic surveys are routinely used to assess fish abundance. To ensure accurate population estimates, the characteristics of echoes from constituent species must be quantified. Kirchhoff-ray mode (KRM) backscatter models were used to quantify acoustic characteristics of Bering Sea and Gulf of Alask...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
2004
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Online Access: | http://dx.doi.org/10.1139/f04-117 http://www.nrcresearchpress.com/doi/pdf/10.1139/f04-117 |
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crcansciencepubl:10.1139/f04-117 2024-06-23T07:51:45+00:00 Acoustic characteristics of forage fish species in the Gulf of Alaska and Bering Sea based on Kirchhoff-approximation models Gauthier, Stéphane Horne, John K 2004 http://dx.doi.org/10.1139/f04-117 http://www.nrcresearchpress.com/doi/pdf/10.1139/f04-117 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 61, issue 10, page 1839-1850 ISSN 0706-652X 1205-7533 journal-article 2004 crcansciencepubl https://doi.org/10.1139/f04-117 2024-05-24T13:05:54Z Acoustic surveys are routinely used to assess fish abundance. To ensure accurate population estimates, the characteristics of echoes from constituent species must be quantified. Kirchhoff-ray mode (KRM) backscatter models were used to quantify acoustic characteristics of Bering Sea and Gulf of Alaska pelagic fish species: capelin (Mallotus villosus), Pacific herring (Clupea pallasii), walleye pollock (Theragra chalcogramma), Atka mackerel (Pleurogrammus monopterygius), and eulachon (Thaleichthys pacificus). Atka mackerel and eulachon do not have swimbladders. Acoustic backscatter was estimated as a function of insonifying frequency, fish length, and body orientation relative to the incident wave front. Backscatter intensity and variance estimates were compared to examine the potential to discriminate among species. Based on relative intensity differences, species could be separated in two major groups: fish with gas-filled swimbladders and fish without swimbladders. The effects of length and tilt angle on echo intensity depended on frequency. Variability in target strength (TS) resulting from morphometric differences was high for species without swimbladders. Based on our model predictions, a series of TS to length equations were developed for each species at the common frequencies used by fisheries acousticians. Article in Journal/Newspaper Bering Sea Theragra chalcogramma Alaska Canadian Science Publishing Atka ENVELOPE(151.789,151.789,60.835,60.835) Bering Sea Gulf of Alaska Pacific Canadian Journal of Fisheries and Aquatic Sciences 61 10 1839 1850 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Acoustic surveys are routinely used to assess fish abundance. To ensure accurate population estimates, the characteristics of echoes from constituent species must be quantified. Kirchhoff-ray mode (KRM) backscatter models were used to quantify acoustic characteristics of Bering Sea and Gulf of Alaska pelagic fish species: capelin (Mallotus villosus), Pacific herring (Clupea pallasii), walleye pollock (Theragra chalcogramma), Atka mackerel (Pleurogrammus monopterygius), and eulachon (Thaleichthys pacificus). Atka mackerel and eulachon do not have swimbladders. Acoustic backscatter was estimated as a function of insonifying frequency, fish length, and body orientation relative to the incident wave front. Backscatter intensity and variance estimates were compared to examine the potential to discriminate among species. Based on relative intensity differences, species could be separated in two major groups: fish with gas-filled swimbladders and fish without swimbladders. The effects of length and tilt angle on echo intensity depended on frequency. Variability in target strength (TS) resulting from morphometric differences was high for species without swimbladders. Based on our model predictions, a series of TS to length equations were developed for each species at the common frequencies used by fisheries acousticians. |
format |
Article in Journal/Newspaper |
author |
Gauthier, Stéphane Horne, John K |
spellingShingle |
Gauthier, Stéphane Horne, John K Acoustic characteristics of forage fish species in the Gulf of Alaska and Bering Sea based on Kirchhoff-approximation models |
author_facet |
Gauthier, Stéphane Horne, John K |
author_sort |
Gauthier, Stéphane |
title |
Acoustic characteristics of forage fish species in the Gulf of Alaska and Bering Sea based on Kirchhoff-approximation models |
title_short |
Acoustic characteristics of forage fish species in the Gulf of Alaska and Bering Sea based on Kirchhoff-approximation models |
title_full |
Acoustic characteristics of forage fish species in the Gulf of Alaska and Bering Sea based on Kirchhoff-approximation models |
title_fullStr |
Acoustic characteristics of forage fish species in the Gulf of Alaska and Bering Sea based on Kirchhoff-approximation models |
title_full_unstemmed |
Acoustic characteristics of forage fish species in the Gulf of Alaska and Bering Sea based on Kirchhoff-approximation models |
title_sort |
acoustic characteristics of forage fish species in the gulf of alaska and bering sea based on kirchhoff-approximation models |
publisher |
Canadian Science Publishing |
publishDate |
2004 |
url |
http://dx.doi.org/10.1139/f04-117 http://www.nrcresearchpress.com/doi/pdf/10.1139/f04-117 |
long_lat |
ENVELOPE(151.789,151.789,60.835,60.835) |
geographic |
Atka Bering Sea Gulf of Alaska Pacific |
geographic_facet |
Atka Bering Sea Gulf of Alaska Pacific |
genre |
Bering Sea Theragra chalcogramma Alaska |
genre_facet |
Bering Sea Theragra chalcogramma Alaska |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 61, issue 10, page 1839-1850 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f04-117 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
61 |
container_issue |
10 |
container_start_page |
1839 |
op_container_end_page |
1850 |
_version_ |
1802642876852600832 |