Silent ships do not always encounter more fish: comparison of acoustic backscatter recorded by a noise-reduced and a conventional research vessel
<qd> De Robertis, A., Hjellvik, V., Williamson, N. J., and Wilson, C. D. 2008. Silent ships do not always encounter more fish: comparison of acoustic backscatter recorded by a noise-reduced and a conventional research vessel. – ICES Journal of Marine Science, 65. </qd>The extent to which...
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fthighwire:oai:open-archive.highwire.org:icesjms:fsn025v1 2023-05-15T15:43:41+02:00 Silent ships do not always encounter more fish: comparison of acoustic backscatter recorded by a noise-reduced and a conventional research vessel De Robertis, Alex Hjellvik, Vidar Williamson, Neal J. Wilson, Christopher D. 2008-03-11 12:15:45.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/fsn025v1 https://doi.org/10.1093/icesjms/fsn025 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/fsn025v1 http://dx.doi.org/10.1093/icesjms/fsn025 Copyright (C) 2008, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Article TEXT 2008 fthighwire https://doi.org/10.1093/icesjms/fsn025 2013-05-26T22:26:33Z <qd> De Robertis, A., Hjellvik, V., Williamson, N. J., and Wilson, C. D. 2008. Silent ships do not always encounter more fish: comparison of acoustic backscatter recorded by a noise-reduced and a conventional research vessel. – ICES Journal of Marine Science, 65. </qd>The extent to which fish avoid approaching research vessels is an important source of uncertainty in fisheries surveys. Vessels radiate noise at the frequencies where fish hearing is most sensitive, and noise is thus thought to be the primary stimulus for vessel avoidance. In an effort to minimize vessel avoidance, international standards for noise emission by research vessels have been established. Although vessels meeting these criteria are now in service, the effectiveness of noise quietening on vessel avoidance remains poorly understood. The new, noise-reduced, RV “Oscar Dyson” (OD) will augment the conventionally constructed research vessel, “Miller Freeman” (MF) and serve as the primary platform in conducting acoustic surveys of walleye pollock ( Theragra chalcogramma ) in Alaska. To investigate whether noise-reduction measures result in differential avoidance, which would bias the pollock abundance time-series, we conducted an inter-vessel comparison of acoustic backscatter recorded by OD and MF during a survey of walleye pollock in 2006 in the eastern Bering Sea. Overall, we found no evidence for differences in vessel avoidance that would impact the echo integration results of adult pollock. Analysis of pollock depth distributions from both vessels suggests that there is a comparatively greater diving response to OD, with the reaction taking place primarily after the vessel has passed and for fish shallower than 90 m. Given that the change in vertical distribution is after the fish have been detected by the echosounder, this reaction should not influence echo-integration measurements. The results indicate that use of the OD rather than the MF is unlikely to bias the Bering Sea survey time-series through changes in vessel ... Text Bering Sea Theragra chalcogramma Alaska HighWire Press (Stanford University) Bering Sea Williamson ENVELOPE(-65.383,-65.383,-67.717,-67.717) ICES Journal of Marine Science 65 4 623 635 |
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HighWire Press (Stanford University) |
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Article De Robertis, Alex Hjellvik, Vidar Williamson, Neal J. Wilson, Christopher D. Silent ships do not always encounter more fish: comparison of acoustic backscatter recorded by a noise-reduced and a conventional research vessel |
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description |
<qd> De Robertis, A., Hjellvik, V., Williamson, N. J., and Wilson, C. D. 2008. Silent ships do not always encounter more fish: comparison of acoustic backscatter recorded by a noise-reduced and a conventional research vessel. – ICES Journal of Marine Science, 65. </qd>The extent to which fish avoid approaching research vessels is an important source of uncertainty in fisheries surveys. Vessels radiate noise at the frequencies where fish hearing is most sensitive, and noise is thus thought to be the primary stimulus for vessel avoidance. In an effort to minimize vessel avoidance, international standards for noise emission by research vessels have been established. Although vessels meeting these criteria are now in service, the effectiveness of noise quietening on vessel avoidance remains poorly understood. The new, noise-reduced, RV “Oscar Dyson” (OD) will augment the conventionally constructed research vessel, “Miller Freeman” (MF) and serve as the primary platform in conducting acoustic surveys of walleye pollock ( Theragra chalcogramma ) in Alaska. To investigate whether noise-reduction measures result in differential avoidance, which would bias the pollock abundance time-series, we conducted an inter-vessel comparison of acoustic backscatter recorded by OD and MF during a survey of walleye pollock in 2006 in the eastern Bering Sea. Overall, we found no evidence for differences in vessel avoidance that would impact the echo integration results of adult pollock. Analysis of pollock depth distributions from both vessels suggests that there is a comparatively greater diving response to OD, with the reaction taking place primarily after the vessel has passed and for fish shallower than 90 m. Given that the change in vertical distribution is after the fish have been detected by the echosounder, this reaction should not influence echo-integration measurements. The results indicate that use of the OD rather than the MF is unlikely to bias the Bering Sea survey time-series through changes in vessel ... |
format |
Text |
author |
De Robertis, Alex Hjellvik, Vidar Williamson, Neal J. Wilson, Christopher D. |
author_facet |
De Robertis, Alex Hjellvik, Vidar Williamson, Neal J. Wilson, Christopher D. |
author_sort |
De Robertis, Alex |
title |
Silent ships do not always encounter more fish: comparison of acoustic backscatter recorded by a noise-reduced and a conventional research vessel |
title_short |
Silent ships do not always encounter more fish: comparison of acoustic backscatter recorded by a noise-reduced and a conventional research vessel |
title_full |
Silent ships do not always encounter more fish: comparison of acoustic backscatter recorded by a noise-reduced and a conventional research vessel |
title_fullStr |
Silent ships do not always encounter more fish: comparison of acoustic backscatter recorded by a noise-reduced and a conventional research vessel |
title_full_unstemmed |
Silent ships do not always encounter more fish: comparison of acoustic backscatter recorded by a noise-reduced and a conventional research vessel |
title_sort |
silent ships do not always encounter more fish: comparison of acoustic backscatter recorded by a noise-reduced and a conventional research vessel |
publisher |
Oxford University Press |
publishDate |
2008 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/fsn025v1 https://doi.org/10.1093/icesjms/fsn025 |
long_lat |
ENVELOPE(-65.383,-65.383,-67.717,-67.717) |
geographic |
Bering Sea Williamson |
geographic_facet |
Bering Sea Williamson |
genre |
Bering Sea Theragra chalcogramma Alaska |
genre_facet |
Bering Sea Theragra chalcogramma Alaska |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/fsn025v1 http://dx.doi.org/10.1093/icesjms/fsn025 |
op_rights |
Copyright (C) 2008, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1093/icesjms/fsn025 |
container_title |
ICES Journal of Marine Science |
container_volume |
65 |
container_issue |
4 |
container_start_page |
623 |
op_container_end_page |
635 |
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1766377868637503488 |