Analysis of permanent magnets as elasmobranch bycatch reduction devices in hook-and-line and longline trials
Previous studies indicate that elasmobranch fishes (sharks,skates and rays) detect the Earth’s geomagnetic field by indirect magnetoreception through electromagneticinduction, using their ampullae of Lorenzini. Applying this concept, we evaluated the capture of elasmobranchs in the presence of perma...
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ftoceandocs:oai:aquadocs.org:1834/25349 2023-05-15T18:06:07+02:00 Analysis of permanent magnets as elasmobranch bycatch reduction devices in hook-and-line and longline trials O'Connell, Craig P. Abel, Daniel C. Stroud, Eric M. Rice, Patrick H. 2011 application/pdf 394-401 http://hdl.handle.net/1834/25349 en eng http://fishbull.noaa.gov/1094/1094oconnell.pdf 0090-0656 http://hdl.handle.net/1834/25349 http://aquaticcommons.org/id/eprint/8699 403 2012-06-07 14:50:56 8699 United States National Marine Fisheries Service Biology Ecology Fisheries article TRUE 2011 ftoceandocs 2023-04-06T17:02:52Z Previous studies indicate that elasmobranch fishes (sharks,skates and rays) detect the Earth’s geomagnetic field by indirect magnetoreception through electromagneticinduction, using their ampullae of Lorenzini. Applying this concept, we evaluated the capture of elasmobranchs in the presence of permanent magnets in hook-and-line and inshorelongline fishing experiments. Hooks with neodymium-iron-boron magnets significantly reduced the capture ofelasmobranchs overall in comparison with control and procedural control hooks in the hook-and-line experiment.Catches of Atlantic sharpnose shark (Rhizoprionodon terraenovae) and smooth dogfish (Mustelus canis) were signif icantly reduced with magnetic hook-and-line treatments, whereas catches of spiny dogfish (Squalus acanthias) and clearnose skate (Raja eglanteria) were not.Longline hooks with barium-ferrite magnets significantly reduced total elasmobranch capture when compared with control hooks. In the longline study, capture of blacktip sharks (Carcharhinus limbatus) and southern stingrays (Dasyatis americana) was reduced on magnetic hooks, whereascapture of sandbar shark (Carcharhinus plumbeus) was not affected. Teleosts, such as red drum (Sciaenops ocellatus), Atlantic croaker (Micropogonias undulatus), oyster toadfish(Opsanus tau), black sea bass (Centropristis striata), and the bluefish (Pomatomas saltatrix), showed no hook preference in either hook-and-line or longline studies. These results indicate that permanent magnets, although eliciting species-specific capture trends, warrant further investigation in commercial longline and recreational fisheries, where bycatch mortality is a leading contributor to declines in elasmobranch populations. Article in Journal/Newspaper Red drum Sciaenops ocellatus spiny dogfish Squalus acanthias IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
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Open Polar |
collection |
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
op_collection_id |
ftoceandocs |
language |
English |
topic |
Biology Ecology Fisheries |
spellingShingle |
Biology Ecology Fisheries O'Connell, Craig P. Abel, Daniel C. Stroud, Eric M. Rice, Patrick H. Analysis of permanent magnets as elasmobranch bycatch reduction devices in hook-and-line and longline trials |
topic_facet |
Biology Ecology Fisheries |
description |
Previous studies indicate that elasmobranch fishes (sharks,skates and rays) detect the Earth’s geomagnetic field by indirect magnetoreception through electromagneticinduction, using their ampullae of Lorenzini. Applying this concept, we evaluated the capture of elasmobranchs in the presence of permanent magnets in hook-and-line and inshorelongline fishing experiments. Hooks with neodymium-iron-boron magnets significantly reduced the capture ofelasmobranchs overall in comparison with control and procedural control hooks in the hook-and-line experiment.Catches of Atlantic sharpnose shark (Rhizoprionodon terraenovae) and smooth dogfish (Mustelus canis) were signif icantly reduced with magnetic hook-and-line treatments, whereas catches of spiny dogfish (Squalus acanthias) and clearnose skate (Raja eglanteria) were not.Longline hooks with barium-ferrite magnets significantly reduced total elasmobranch capture when compared with control hooks. In the longline study, capture of blacktip sharks (Carcharhinus limbatus) and southern stingrays (Dasyatis americana) was reduced on magnetic hooks, whereascapture of sandbar shark (Carcharhinus plumbeus) was not affected. Teleosts, such as red drum (Sciaenops ocellatus), Atlantic croaker (Micropogonias undulatus), oyster toadfish(Opsanus tau), black sea bass (Centropristis striata), and the bluefish (Pomatomas saltatrix), showed no hook preference in either hook-and-line or longline studies. These results indicate that permanent magnets, although eliciting species-specific capture trends, warrant further investigation in commercial longline and recreational fisheries, where bycatch mortality is a leading contributor to declines in elasmobranch populations. |
format |
Article in Journal/Newspaper |
author |
O'Connell, Craig P. Abel, Daniel C. Stroud, Eric M. Rice, Patrick H. |
author_facet |
O'Connell, Craig P. Abel, Daniel C. Stroud, Eric M. Rice, Patrick H. |
author_sort |
O'Connell, Craig P. |
title |
Analysis of permanent magnets as elasmobranch bycatch reduction devices in hook-and-line and longline trials |
title_short |
Analysis of permanent magnets as elasmobranch bycatch reduction devices in hook-and-line and longline trials |
title_full |
Analysis of permanent magnets as elasmobranch bycatch reduction devices in hook-and-line and longline trials |
title_fullStr |
Analysis of permanent magnets as elasmobranch bycatch reduction devices in hook-and-line and longline trials |
title_full_unstemmed |
Analysis of permanent magnets as elasmobranch bycatch reduction devices in hook-and-line and longline trials |
title_sort |
analysis of permanent magnets as elasmobranch bycatch reduction devices in hook-and-line and longline trials |
publishDate |
2011 |
url |
http://hdl.handle.net/1834/25349 |
genre |
Red drum Sciaenops ocellatus spiny dogfish Squalus acanthias |
genre_facet |
Red drum Sciaenops ocellatus spiny dogfish Squalus acanthias |
op_source |
http://aquaticcommons.org/id/eprint/8699 403 2012-06-07 14:50:56 8699 United States National Marine Fisheries Service |
op_relation |
http://fishbull.noaa.gov/1094/1094oconnell.pdf 0090-0656 http://hdl.handle.net/1834/25349 |
_version_ |
1766177704973959168 |