Drag from fishing gear entangling North Atlantic right whales
Lethal and sublethal fishing gear entanglement is pervasive in North Atlantic right whales (Eubalaena glacialis). Entanglement can lead to direct injury and is likely to incur substantial energetic costs. This study (1) evaluates drag characteristics of entangled right whales, (2) contextualizes gea...
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ftunivnebraskali:oai:digitalcommons.unl.edu:usdeptcommercepub-1538 2023-11-12T04:16:47+01:00 Drag from fishing gear entangling North Atlantic right whales van der Hoop, Julie M. Corkeron, Peter Kenney, John Landry, Scott Morin, David Smith, Jamison Moore, Michael J. 2015-01-01T08:00:00Z application/pdf https://digitalcommons.unl.edu/usdeptcommercepub/539 https://digitalcommons.unl.edu/context/usdeptcommercepub/article/1538/viewcontent/Hoop_et_al_Marine_Mammal_Science_2015.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/usdeptcommercepub/539 https://digitalcommons.unl.edu/context/usdeptcommercepub/article/1538/viewcontent/Hoop_et_al_Marine_Mammal_Science_2015.pdf Publications, Agencies and Staff of the U.S. Department of Commerce whale fisheries rope thrust line drag coefficient energetics text 2015 ftunivnebraskali 2023-10-30T09:52:43Z Lethal and sublethal fishing gear entanglement is pervasive in North Atlantic right whales (Eubalaena glacialis). Entanglement can lead to direct injury and is likely to incur substantial energetic costs. This study (1) evaluates drag characteristics of entangled right whales, (2) contextualizes gear drag measurements for individual whales, and (3) quantifies the benefits of partial disentanglement. A load cell measured drag forces on 15 sets of fishing gear removed from entangled right whales, a towed satellite telemetry buoy, and 200 m of polypropylene line as it was shortened to 25 m, as they were towed behind a vessel at ~0.77, 1.3, and 2.1 m/s (~1.5, 2.5, and 4 knots) and ~0, 3, and 6 m depth. Mean drag ranges from 8.5 N to 315 N, and can be predicted from the dry weight or length of the gear. Combining gear drag measurements with theoretical estimates of drag on whales’ bodies suggests that on average, entanglement increases drag and propulsive power by 1.47 fold. Reducing trailing line length by 75% can reduce parasitic gear drag by 85%, reinforcing current disentanglement response practices. These drag measurements can be incorporated into disentanglement response, serious injury determination, and evaluation of sublethal effects on population dynamics. Text Eubalaena glacialis North Atlantic University of Nebraska-Lincoln: DigitalCommons@UNL |
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University of Nebraska-Lincoln: DigitalCommons@UNL |
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whale fisheries rope thrust line drag coefficient energetics |
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whale fisheries rope thrust line drag coefficient energetics van der Hoop, Julie M. Corkeron, Peter Kenney, John Landry, Scott Morin, David Smith, Jamison Moore, Michael J. Drag from fishing gear entangling North Atlantic right whales |
topic_facet |
whale fisheries rope thrust line drag coefficient energetics |
description |
Lethal and sublethal fishing gear entanglement is pervasive in North Atlantic right whales (Eubalaena glacialis). Entanglement can lead to direct injury and is likely to incur substantial energetic costs. This study (1) evaluates drag characteristics of entangled right whales, (2) contextualizes gear drag measurements for individual whales, and (3) quantifies the benefits of partial disentanglement. A load cell measured drag forces on 15 sets of fishing gear removed from entangled right whales, a towed satellite telemetry buoy, and 200 m of polypropylene line as it was shortened to 25 m, as they were towed behind a vessel at ~0.77, 1.3, and 2.1 m/s (~1.5, 2.5, and 4 knots) and ~0, 3, and 6 m depth. Mean drag ranges from 8.5 N to 315 N, and can be predicted from the dry weight or length of the gear. Combining gear drag measurements with theoretical estimates of drag on whales’ bodies suggests that on average, entanglement increases drag and propulsive power by 1.47 fold. Reducing trailing line length by 75% can reduce parasitic gear drag by 85%, reinforcing current disentanglement response practices. These drag measurements can be incorporated into disentanglement response, serious injury determination, and evaluation of sublethal effects on population dynamics. |
format |
Text |
author |
van der Hoop, Julie M. Corkeron, Peter Kenney, John Landry, Scott Morin, David Smith, Jamison Moore, Michael J. |
author_facet |
van der Hoop, Julie M. Corkeron, Peter Kenney, John Landry, Scott Morin, David Smith, Jamison Moore, Michael J. |
author_sort |
van der Hoop, Julie M. |
title |
Drag from fishing gear entangling North Atlantic right whales |
title_short |
Drag from fishing gear entangling North Atlantic right whales |
title_full |
Drag from fishing gear entangling North Atlantic right whales |
title_fullStr |
Drag from fishing gear entangling North Atlantic right whales |
title_full_unstemmed |
Drag from fishing gear entangling North Atlantic right whales |
title_sort |
drag from fishing gear entangling north atlantic right whales |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
2015 |
url |
https://digitalcommons.unl.edu/usdeptcommercepub/539 https://digitalcommons.unl.edu/context/usdeptcommercepub/article/1538/viewcontent/Hoop_et_al_Marine_Mammal_Science_2015.pdf |
genre |
Eubalaena glacialis North Atlantic |
genre_facet |
Eubalaena glacialis North Atlantic |
op_source |
Publications, Agencies and Staff of the U.S. Department of Commerce |
op_relation |
https://digitalcommons.unl.edu/usdeptcommercepub/539 https://digitalcommons.unl.edu/context/usdeptcommercepub/article/1538/viewcontent/Hoop_et_al_Marine_Mammal_Science_2015.pdf |
_version_ |
1782333852764602368 |