Silent ships sometimes do encounter more fish. 2. Concurrent echosounder observations from a free-drifting buoy and vessels
Abstract De Robertis, A., and Wilson, C. D. 2010. Silent ships sometimes do encounter more fish. 2. Concurrent echosounder observations from a free-drifting buoy and vessels. – ICES Journal of Marine Science, 67: 996–1003. The reactions of walleye pollock (Theragra chalcogramma) to the NOAA ships “M...
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsp301 http://academic.oup.com/icesjms/article-pdf/67/5/996/29136681/fsp301.pdf |
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croxfordunivpr:10.1093/icesjms/fsp301 2024-06-23T07:57:11+00:00 Silent ships sometimes do encounter more fish. 2. Concurrent echosounder observations from a free-drifting buoy and vessels De Robertis, Alex Wilson, Christopher D. 2010 http://dx.doi.org/10.1093/icesjms/fsp301 http://academic.oup.com/icesjms/article-pdf/67/5/996/29136681/fsp301.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 67, issue 5, page 996-1003 ISSN 1095-9289 1054-3139 journal-article 2010 croxfordunivpr https://doi.org/10.1093/icesjms/fsp301 2024-06-04T06:12:13Z Abstract De Robertis, A., and Wilson, C. D. 2010. Silent ships sometimes do encounter more fish. 2. Concurrent echosounder observations from a free-drifting buoy and vessels. – ICES Journal of Marine Science, 67: 996–1003. The reactions of walleye pollock (Theragra chalcogramma) to the NOAA ships “Miller Freeman” (MF), a conventionally designed research vessel, and the “Oscar Dyson” (OD), a noise-reduced research vessel, were compared near the Shumagin Islands, Alaska. Observations with a buoy-mounted echosounder indicated a stronger decrease in pollock backscatter strength and a greater increase in pollock backscatter depth associated with the passage of the MF than the OD. The pollock began to respond at a distance of ∼270 m from the vessel and were disturbed for several minutes after vessel passage. The reaction to the OD was weak, suggesting that measurements of pollock made by the OD in this environment are not strongly biased by vessel avoidance. Comparison of echosounder observations collected on board each vessel indicated that the MF measured less pollock backscatter, a deeper pollock depth distribution, and weaker single-target echoes than the OD. Together, the results indicate that acoustic measurements from the two vessels are not equivalent because of a reduced avoidance response to the noise-reduced vessel. Article in Journal/Newspaper Theragra chalcogramma Alaska Oxford University Press ICES Journal of Marine Science 67 5 996 1003 |
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description |
Abstract De Robertis, A., and Wilson, C. D. 2010. Silent ships sometimes do encounter more fish. 2. Concurrent echosounder observations from a free-drifting buoy and vessels. – ICES Journal of Marine Science, 67: 996–1003. The reactions of walleye pollock (Theragra chalcogramma) to the NOAA ships “Miller Freeman” (MF), a conventionally designed research vessel, and the “Oscar Dyson” (OD), a noise-reduced research vessel, were compared near the Shumagin Islands, Alaska. Observations with a buoy-mounted echosounder indicated a stronger decrease in pollock backscatter strength and a greater increase in pollock backscatter depth associated with the passage of the MF than the OD. The pollock began to respond at a distance of ∼270 m from the vessel and were disturbed for several minutes after vessel passage. The reaction to the OD was weak, suggesting that measurements of pollock made by the OD in this environment are not strongly biased by vessel avoidance. Comparison of echosounder observations collected on board each vessel indicated that the MF measured less pollock backscatter, a deeper pollock depth distribution, and weaker single-target echoes than the OD. Together, the results indicate that acoustic measurements from the two vessels are not equivalent because of a reduced avoidance response to the noise-reduced vessel. |
format |
Article in Journal/Newspaper |
author |
De Robertis, Alex Wilson, Christopher D. |
spellingShingle |
De Robertis, Alex Wilson, Christopher D. Silent ships sometimes do encounter more fish. 2. Concurrent echosounder observations from a free-drifting buoy and vessels |
author_facet |
De Robertis, Alex Wilson, Christopher D. |
author_sort |
De Robertis, Alex |
title |
Silent ships sometimes do encounter more fish. 2. Concurrent echosounder observations from a free-drifting buoy and vessels |
title_short |
Silent ships sometimes do encounter more fish. 2. Concurrent echosounder observations from a free-drifting buoy and vessels |
title_full |
Silent ships sometimes do encounter more fish. 2. Concurrent echosounder observations from a free-drifting buoy and vessels |
title_fullStr |
Silent ships sometimes do encounter more fish. 2. Concurrent echosounder observations from a free-drifting buoy and vessels |
title_full_unstemmed |
Silent ships sometimes do encounter more fish. 2. Concurrent echosounder observations from a free-drifting buoy and vessels |
title_sort |
silent ships sometimes do encounter more fish. 2. concurrent echosounder observations from a free-drifting buoy and vessels |
publisher |
Oxford University Press (OUP) |
publishDate |
2010 |
url |
http://dx.doi.org/10.1093/icesjms/fsp301 http://academic.oup.com/icesjms/article-pdf/67/5/996/29136681/fsp301.pdf |
genre |
Theragra chalcogramma Alaska |
genre_facet |
Theragra chalcogramma Alaska |
op_source |
ICES Journal of Marine Science volume 67, issue 5, page 996-1003 ISSN 1095-9289 1054-3139 |
op_doi |
https://doi.org/10.1093/icesjms/fsp301 |
container_title |
ICES Journal of Marine Science |
container_volume |
67 |
container_issue |
5 |
container_start_page |
996 |
op_container_end_page |
1003 |
_version_ |
1802650695989460992 |