Louse‐induced mortality thresholds in Atlantic salmon of wild‐origin
Abstract Wild salmonid fish are faced with the challenge of infections from the ectoparasitic salmon louse, which thus dictates the management of salmon aquaculture in areas where farms and wild populations co‐exist. The mortality risk of wild Atlantic salmon is used as an indicator of threat levels...
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crwiley:10.1111/csp2.13079 2024-06-02T08:03:25+00:00 Louse‐induced mortality thresholds in Atlantic salmon of wild‐origin Bui, Samantha Fjelldal, Per Gunnar Hvas, Malthe Karlsen, Ørjan Dalvin, Sussie Norges Forskningsråd Havforskningsinstituttet 2024 http://dx.doi.org/10.1111/csp2.13079 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Conservation Science and Practice volume 6, issue 2 ISSN 2578-4854 2578-4854 journal-article 2024 crwiley https://doi.org/10.1111/csp2.13079 2024-05-03T11:20:27Z Abstract Wild salmonid fish are faced with the challenge of infections from the ectoparasitic salmon louse, which thus dictates the management of salmon aquaculture in areas where farms and wild populations co‐exist. The mortality risk of wild Atlantic salmon is used as an indicator of threat levels when monitoring wild populations, and therefore the aim of this study was to robustly investigate the effect of infection intensity on probability of mortality in salmon of wild origin. To assess critical infection levels, recently‐smoltified Atlantic salmon were infected with intensities ranging from 0 to 2.5 lice g −1 and exposed to a 48‐h simulated migration. The first mortalities occurred when preadults appeared and ceased as lice became adults. Infection intensity negatively affected mortality probability and survival time, whereas the simulated migration had no influence on the probability of mortality. Individual‐level effects of infection on host mortality is difficult to quantify in the field; however, the correlation between louse load and mortality probability obtained in this study can facilitate indirect estimates of mortality risk of wild salmon populations and contribute to conservation efforts associated with this parasite. Article in Journal/Newspaper Atlantic salmon Wiley Online Library Conservation Science and Practice 6 2 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Wild salmonid fish are faced with the challenge of infections from the ectoparasitic salmon louse, which thus dictates the management of salmon aquaculture in areas where farms and wild populations co‐exist. The mortality risk of wild Atlantic salmon is used as an indicator of threat levels when monitoring wild populations, and therefore the aim of this study was to robustly investigate the effect of infection intensity on probability of mortality in salmon of wild origin. To assess critical infection levels, recently‐smoltified Atlantic salmon were infected with intensities ranging from 0 to 2.5 lice g −1 and exposed to a 48‐h simulated migration. The first mortalities occurred when preadults appeared and ceased as lice became adults. Infection intensity negatively affected mortality probability and survival time, whereas the simulated migration had no influence on the probability of mortality. Individual‐level effects of infection on host mortality is difficult to quantify in the field; however, the correlation between louse load and mortality probability obtained in this study can facilitate indirect estimates of mortality risk of wild salmon populations and contribute to conservation efforts associated with this parasite. |
author2 |
Norges Forskningsråd Havforskningsinstituttet |
format |
Article in Journal/Newspaper |
author |
Bui, Samantha Fjelldal, Per Gunnar Hvas, Malthe Karlsen, Ørjan Dalvin, Sussie |
spellingShingle |
Bui, Samantha Fjelldal, Per Gunnar Hvas, Malthe Karlsen, Ørjan Dalvin, Sussie Louse‐induced mortality thresholds in Atlantic salmon of wild‐origin |
author_facet |
Bui, Samantha Fjelldal, Per Gunnar Hvas, Malthe Karlsen, Ørjan Dalvin, Sussie |
author_sort |
Bui, Samantha |
title |
Louse‐induced mortality thresholds in Atlantic salmon of wild‐origin |
title_short |
Louse‐induced mortality thresholds in Atlantic salmon of wild‐origin |
title_full |
Louse‐induced mortality thresholds in Atlantic salmon of wild‐origin |
title_fullStr |
Louse‐induced mortality thresholds in Atlantic salmon of wild‐origin |
title_full_unstemmed |
Louse‐induced mortality thresholds in Atlantic salmon of wild‐origin |
title_sort |
louse‐induced mortality thresholds in atlantic salmon of wild‐origin |
publisher |
Wiley |
publishDate |
2024 |
url |
http://dx.doi.org/10.1111/csp2.13079 |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Conservation Science and Practice volume 6, issue 2 ISSN 2578-4854 2578-4854 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/csp2.13079 |
container_title |
Conservation Science and Practice |
container_volume |
6 |
container_issue |
2 |
_version_ |
1800747936733200384 |