Evaluation of an Electric Gradient to Deter Seal Predation on Salmon Caught in Gill‐Net Test Fisheries
Abstract An electric deterrent system was tested as an effective and safe method of deterring predation by Pacific harbor seals Phoca vitulina richardsi on sockeye salmon Oncorhynchus nerka and pink salmon Oncorhynchus gorbuscha caught in a Fraser River gill‐net test fishery. Seals were deterred fro...
Published in: | North American Journal of Fisheries Management |
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Online Access: | http://dx.doi.org/10.1577/m08-083.1 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1577/M08-083.1 |
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crwiley:10.1577/m08-083.1 2023-12-03T10:28:35+01:00 Evaluation of an Electric Gradient to Deter Seal Predation on Salmon Caught in Gill‐Net Test Fisheries Forrest, Keith W. Cave, Jim D. Michielsens, Catherine G. J. Haulena, Martin Smith, David V. 2009 http://dx.doi.org/10.1577/m08-083.1 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1577/M08-083.1 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor North American Journal of Fisheries Management volume 29, issue 4, page 885-894 ISSN 0275-5947 1548-8675 Management, Monitoring, Policy and Law Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2009 crwiley https://doi.org/10.1577/m08-083.1 2023-11-09T13:24:59Z Abstract An electric deterrent system was tested as an effective and safe method of deterring predation by Pacific harbor seals Phoca vitulina richardsi on sockeye salmon Oncorhynchus nerka and pink salmon Oncorhynchus gorbuscha caught in a Fraser River gill‐net test fishery. Seals were deterred from foraging in a test fishing gill net in the Fraser River by using a pulsed, low‐voltage DC electric gradient. Salmon catch per unit effort (CPUE) was significantly greater for the treated (electric) section of the gill net than for the nontreated section (marginal mean CPUE = 4.0/1,000 m · min versus 1.0/1,000 m · min), and there was no overlap in the 95% confidence intervals for the two treatments. There were no apparent injuries to any animals during the study. This previously undocumented nonlethal technology demonstrates the potential to reduce pinniped predation on salmon, with meaningful implications for fisheries management agencies that rely on gill‐net test fisheries in freshwater rivers frequented by pinnipeds. Article in Journal/Newspaper Oncorhynchus gorbuscha Phoca vitulina Pink salmon Wiley Online Library (via Crossref) Fraser River ENVELOPE(-62.243,-62.243,56.619,56.619) Pacific Sockeye ENVELOPE(-130.143,-130.143,54.160,54.160) North American Journal of Fisheries Management 29 4 885 894 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Management, Monitoring, Policy and Law Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Management, Monitoring, Policy and Law Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Forrest, Keith W. Cave, Jim D. Michielsens, Catherine G. J. Haulena, Martin Smith, David V. Evaluation of an Electric Gradient to Deter Seal Predation on Salmon Caught in Gill‐Net Test Fisheries |
topic_facet |
Management, Monitoring, Policy and Law Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Abstract An electric deterrent system was tested as an effective and safe method of deterring predation by Pacific harbor seals Phoca vitulina richardsi on sockeye salmon Oncorhynchus nerka and pink salmon Oncorhynchus gorbuscha caught in a Fraser River gill‐net test fishery. Seals were deterred from foraging in a test fishing gill net in the Fraser River by using a pulsed, low‐voltage DC electric gradient. Salmon catch per unit effort (CPUE) was significantly greater for the treated (electric) section of the gill net than for the nontreated section (marginal mean CPUE = 4.0/1,000 m · min versus 1.0/1,000 m · min), and there was no overlap in the 95% confidence intervals for the two treatments. There were no apparent injuries to any animals during the study. This previously undocumented nonlethal technology demonstrates the potential to reduce pinniped predation on salmon, with meaningful implications for fisheries management agencies that rely on gill‐net test fisheries in freshwater rivers frequented by pinnipeds. |
format |
Article in Journal/Newspaper |
author |
Forrest, Keith W. Cave, Jim D. Michielsens, Catherine G. J. Haulena, Martin Smith, David V. |
author_facet |
Forrest, Keith W. Cave, Jim D. Michielsens, Catherine G. J. Haulena, Martin Smith, David V. |
author_sort |
Forrest, Keith W. |
title |
Evaluation of an Electric Gradient to Deter Seal Predation on Salmon Caught in Gill‐Net Test Fisheries |
title_short |
Evaluation of an Electric Gradient to Deter Seal Predation on Salmon Caught in Gill‐Net Test Fisheries |
title_full |
Evaluation of an Electric Gradient to Deter Seal Predation on Salmon Caught in Gill‐Net Test Fisheries |
title_fullStr |
Evaluation of an Electric Gradient to Deter Seal Predation on Salmon Caught in Gill‐Net Test Fisheries |
title_full_unstemmed |
Evaluation of an Electric Gradient to Deter Seal Predation on Salmon Caught in Gill‐Net Test Fisheries |
title_sort |
evaluation of an electric gradient to deter seal predation on salmon caught in gill‐net test fisheries |
publisher |
Wiley |
publishDate |
2009 |
url |
http://dx.doi.org/10.1577/m08-083.1 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1577/M08-083.1 |
long_lat |
ENVELOPE(-62.243,-62.243,56.619,56.619) ENVELOPE(-130.143,-130.143,54.160,54.160) |
geographic |
Fraser River Pacific Sockeye |
geographic_facet |
Fraser River Pacific Sockeye |
genre |
Oncorhynchus gorbuscha Phoca vitulina Pink salmon |
genre_facet |
Oncorhynchus gorbuscha Phoca vitulina Pink salmon |
op_source |
North American Journal of Fisheries Management volume 29, issue 4, page 885-894 ISSN 0275-5947 1548-8675 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1577/m08-083.1 |
container_title |
North American Journal of Fisheries Management |
container_volume |
29 |
container_issue |
4 |
container_start_page |
885 |
op_container_end_page |
894 |
_version_ |
1784253329237344256 |