Wild Atlantic salmon exposed to sea lice from aquaculture show reduced marine survival and modified response to ocean climate
Abstract Impacts on marine survival of Atlantic salmon Salmo salar include sea lice Lepeophtheirus salmonis infestation from coastal aquaculture, and ocean climate forcing. These effects may interact because infestation compromises smolt growth and body condition, and thus response to environmental...
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsaa079 http://academic.oup.com/icesjms/article-pdf/78/1/368/36682855/fsaa079.pdf |
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croxfordunivpr:10.1093/icesjms/fsaa079 2024-06-23T07:51:14+00:00 Wild Atlantic salmon exposed to sea lice from aquaculture show reduced marine survival and modified response to ocean climate Shephard, Samuel Gargan, Patrick Browman, Howard Inland Fisheries Ireland 2020 http://dx.doi.org/10.1093/icesjms/fsaa079 http://academic.oup.com/icesjms/article-pdf/78/1/368/36682855/fsaa079.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model ICES Journal of Marine Science volume 78, issue 1, page 368-376 ISSN 1095-9289 journal-article 2020 croxfordunivpr https://doi.org/10.1093/icesjms/fsaa079 2024-06-11T04:18:16Z Abstract Impacts on marine survival of Atlantic salmon Salmo salar include sea lice Lepeophtheirus salmonis infestation from coastal aquaculture, and ocean climate forcing. These effects may interact because infestation compromises smolt growth and body condition, and thus response to environmental conditions. We hypothesized that migrating smolts exposed to lice from salmon farms would show (i) reduced one sea-winter (1SW) returns to natal rivers and (ii) a shift in relationships between ocean climate and returns. Annual counts of 1SW fish were studied from ten rivers in Ireland, including five “control” systems without salmon aquaculture. Most counts showed a downward trend, consistent with declines in Atlantic salmon populations. Rivers with aquaculture showed lesser returns (mean 33%, range 19–46%) in years following high lice levels on nearby salmon farms. The level of likely lice pressure also modified how annual 1SW returns varied with ocean conditions. Returns to control rivers showed a weak negative relationship with the Atlantic Multi-decadal Oscillation (AMO) in the late summer (September) of the out-migrating year. This negative AMO effect became much stronger for fish migrating in low lice years but was not evident for high lice years. Smolts experiencing mild-to-moderate lice infestation may show greater sensitivity to ocean warming. Article in Journal/Newspaper Atlantic salmon Salmo salar Oxford University Press ICES Journal of Marine Science 78 1 368 376 |
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Oxford University Press |
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croxfordunivpr |
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English |
description |
Abstract Impacts on marine survival of Atlantic salmon Salmo salar include sea lice Lepeophtheirus salmonis infestation from coastal aquaculture, and ocean climate forcing. These effects may interact because infestation compromises smolt growth and body condition, and thus response to environmental conditions. We hypothesized that migrating smolts exposed to lice from salmon farms would show (i) reduced one sea-winter (1SW) returns to natal rivers and (ii) a shift in relationships between ocean climate and returns. Annual counts of 1SW fish were studied from ten rivers in Ireland, including five “control” systems without salmon aquaculture. Most counts showed a downward trend, consistent with declines in Atlantic salmon populations. Rivers with aquaculture showed lesser returns (mean 33%, range 19–46%) in years following high lice levels on nearby salmon farms. The level of likely lice pressure also modified how annual 1SW returns varied with ocean conditions. Returns to control rivers showed a weak negative relationship with the Atlantic Multi-decadal Oscillation (AMO) in the late summer (September) of the out-migrating year. This negative AMO effect became much stronger for fish migrating in low lice years but was not evident for high lice years. Smolts experiencing mild-to-moderate lice infestation may show greater sensitivity to ocean warming. |
author2 |
Browman, Howard Inland Fisheries Ireland |
format |
Article in Journal/Newspaper |
author |
Shephard, Samuel Gargan, Patrick |
spellingShingle |
Shephard, Samuel Gargan, Patrick Wild Atlantic salmon exposed to sea lice from aquaculture show reduced marine survival and modified response to ocean climate |
author_facet |
Shephard, Samuel Gargan, Patrick |
author_sort |
Shephard, Samuel |
title |
Wild Atlantic salmon exposed to sea lice from aquaculture show reduced marine survival and modified response to ocean climate |
title_short |
Wild Atlantic salmon exposed to sea lice from aquaculture show reduced marine survival and modified response to ocean climate |
title_full |
Wild Atlantic salmon exposed to sea lice from aquaculture show reduced marine survival and modified response to ocean climate |
title_fullStr |
Wild Atlantic salmon exposed to sea lice from aquaculture show reduced marine survival and modified response to ocean climate |
title_full_unstemmed |
Wild Atlantic salmon exposed to sea lice from aquaculture show reduced marine survival and modified response to ocean climate |
title_sort |
wild atlantic salmon exposed to sea lice from aquaculture show reduced marine survival and modified response to ocean climate |
publisher |
Oxford University Press (OUP) |
publishDate |
2020 |
url |
http://dx.doi.org/10.1093/icesjms/fsaa079 http://academic.oup.com/icesjms/article-pdf/78/1/368/36682855/fsaa079.pdf |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
ICES Journal of Marine Science volume 78, issue 1, page 368-376 ISSN 1095-9289 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/icesjms/fsaa079 |
container_title |
ICES Journal of Marine Science |
container_volume |
78 |
container_issue |
1 |
container_start_page |
368 |
op_container_end_page |
376 |
_version_ |
1802642266035060736 |