Swimming with the fishes: validating drift diving to identify farmed Atlantic salmon escapees in the wild
Escaped farmed Atlantic salmon Salmo salar interbreeding with wild conspecifics represents a threat to the genetic integrity and viability of wild populations. Therefore, it is necessary to accurately quantify escapees in riverine systems to monitor and mitigate interactions with wild conspecifics....
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Online Access: | http://hdl.handle.net/11250/2640197 https://doi.org/10.3354/aei00326 |
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ftimr:oai:imr.brage.unit.no:11250/2640197 2023-05-15T15:31:17+02:00 Swimming with the fishes: validating drift diving to identify farmed Atlantic salmon escapees in the wild Mahlum, Shad Kenneth Skoglund, Helge Wiers, Tore Norman, E. S. Barlaup, Bjørn Torgeir Wennevik, Vidar Glover, Kevin Urdal, Kurt Bakke, Gunnar O Vollset, Knut 2019 application/pdf http://hdl.handle.net/11250/2640197 https://doi.org/10.3354/aei00326 eng eng Aquaculture Environment Interactions. 2019, 11 417-427. urn:issn:1869-215X http://hdl.handle.net/11250/2640197 https://doi.org/10.3354/aei00326 cristin:1781167 417-427 11 Aquaculture Environment Interactions Journal article Peer reviewed 2019 ftimr https://doi.org/10.3354/aei00326 2021-09-23T20:14:31Z Escaped farmed Atlantic salmon Salmo salar interbreeding with wild conspecifics represents a threat to the genetic integrity and viability of wild populations. Therefore, it is necessary to accurately quantify escapees in riverine systems to monitor and mitigate interactions with wild conspecifics. Drift diving surveys are presently used in Norway to quantify the number of wild and escaped farmed salmon in rivers. However, limited information is available on the validity of the method for distinguishing escapees from wild conspecifics. Comparing the proportion of escapees calculated from drift diving (mean = 8.5%) and net captures (mean = 8.6%), we found that drift diving was well correlated with net captures (adj. r2 = 0.79). Furthermore, scale analysis from an independent data set demonstrated a 98% true positive rate when identifying and capturing farmed escapees during drift diving. The results of this study indicate that drift diving is an accurate and robust method for quantifying escaped farmed salmon, at least in rivers where observation conditions are adequate for snorkeling. In general, drift diving can be a valuable tool for stakeholders to quickly assess broad spatial extents with limited time and resources. publishedVersion Article in Journal/Newspaper Atlantic salmon Salmo salar Institute for Marine Research: Brage IMR Norway Aquaculture Environment Interactions 11 417 427 |
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Open Polar |
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Institute for Marine Research: Brage IMR |
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English |
description |
Escaped farmed Atlantic salmon Salmo salar interbreeding with wild conspecifics represents a threat to the genetic integrity and viability of wild populations. Therefore, it is necessary to accurately quantify escapees in riverine systems to monitor and mitigate interactions with wild conspecifics. Drift diving surveys are presently used in Norway to quantify the number of wild and escaped farmed salmon in rivers. However, limited information is available on the validity of the method for distinguishing escapees from wild conspecifics. Comparing the proportion of escapees calculated from drift diving (mean = 8.5%) and net captures (mean = 8.6%), we found that drift diving was well correlated with net captures (adj. r2 = 0.79). Furthermore, scale analysis from an independent data set demonstrated a 98% true positive rate when identifying and capturing farmed escapees during drift diving. The results of this study indicate that drift diving is an accurate and robust method for quantifying escaped farmed salmon, at least in rivers where observation conditions are adequate for snorkeling. In general, drift diving can be a valuable tool for stakeholders to quickly assess broad spatial extents with limited time and resources. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Mahlum, Shad Kenneth Skoglund, Helge Wiers, Tore Norman, E. S. Barlaup, Bjørn Torgeir Wennevik, Vidar Glover, Kevin Urdal, Kurt Bakke, Gunnar O Vollset, Knut |
spellingShingle |
Mahlum, Shad Kenneth Skoglund, Helge Wiers, Tore Norman, E. S. Barlaup, Bjørn Torgeir Wennevik, Vidar Glover, Kevin Urdal, Kurt Bakke, Gunnar O Vollset, Knut Swimming with the fishes: validating drift diving to identify farmed Atlantic salmon escapees in the wild |
author_facet |
Mahlum, Shad Kenneth Skoglund, Helge Wiers, Tore Norman, E. S. Barlaup, Bjørn Torgeir Wennevik, Vidar Glover, Kevin Urdal, Kurt Bakke, Gunnar O Vollset, Knut |
author_sort |
Mahlum, Shad Kenneth |
title |
Swimming with the fishes: validating drift diving to identify farmed Atlantic salmon escapees in the wild |
title_short |
Swimming with the fishes: validating drift diving to identify farmed Atlantic salmon escapees in the wild |
title_full |
Swimming with the fishes: validating drift diving to identify farmed Atlantic salmon escapees in the wild |
title_fullStr |
Swimming with the fishes: validating drift diving to identify farmed Atlantic salmon escapees in the wild |
title_full_unstemmed |
Swimming with the fishes: validating drift diving to identify farmed Atlantic salmon escapees in the wild |
title_sort |
swimming with the fishes: validating drift diving to identify farmed atlantic salmon escapees in the wild |
publishDate |
2019 |
url |
http://hdl.handle.net/11250/2640197 https://doi.org/10.3354/aei00326 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
417-427 11 Aquaculture Environment Interactions |
op_relation |
Aquaculture Environment Interactions. 2019, 11 417-427. urn:issn:1869-215X http://hdl.handle.net/11250/2640197 https://doi.org/10.3354/aei00326 cristin:1781167 |
op_doi |
https://doi.org/10.3354/aei00326 |
container_title |
Aquaculture Environment Interactions |
container_volume |
11 |
container_start_page |
417 |
op_container_end_page |
427 |
_version_ |
1766361783495294976 |