The Impact of Escaped Farmed Atlantic Salmon (Salmo salar L.) on Catch Statistics in Scotland
In Scotland and elsewhere, there are concerns that escaped farmed Atlantic salmon (Salmo salar L.) may impact on wild salmon stocks. Potential detrimental effects could arise through disease spread, competition, or inter-breeding. We investigated whether there is evidence of a direct effect of recor...
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Online Access: | http://hdl.handle.net/1893/9355 https://doi.org/10.1371/journal.pone.0043560 http://dspace.stir.ac.uk/bitstream/1893/9355/1/journal.pone.0043560.pdf |
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ftunivstirling:oai:dspace.stir.ac.uk:1893/9355 2023-05-15T15:31:51+02:00 The Impact of Escaped Farmed Atlantic Salmon (Salmo salar L.) on Catch Statistics in Scotland Green, Darren Penman, David Migaud, Herve Bron, James Taggart, John McAndrew, Brendan Institute of Aquaculture orcid:0000-0001-9026-5675 orcid:0000-0001-8608-6631 orcid:0000-0002-5404-7512 orcid:0000-0003-3544-0519 orcid:0000-0002-3843-9663 orcid:0000-0001-7384-5133 2012-09 application/pdf http://hdl.handle.net/1893/9355 https://doi.org/10.1371/journal.pone.0043560 http://dspace.stir.ac.uk/bitstream/1893/9355/1/journal.pone.0043560.pdf en eng Public Library of Science Green D, Penman D, Migaud H, Bron J, Taggart J & McAndrew B (2012) The Impact of Escaped Farmed Atlantic Salmon (Salmo salar L.) on Catch Statistics in Scotland. PLoS ONE, 7 (9), p. e43560. https://doi.org/10.1371/journal.pone.0043560 http://hdl.handle.net/1893/9355 doi:10.1371/journal.pone.0043560 22970132 WOS:000308458400014 2-s2.0-84866078692 761358 http://dspace.stir.ac.uk/bitstream/1893/9355/1/journal.pone.0043560.pdf Publisher is open-access. Open access publishing allows free access to and distribution of published articles where the author retains copyright of their work by employing a Creative Commons attribution licence: http://creativecommons.org/licenses/by/2.5/ Proper attribution of authorship and correct citation details should be given. http://creativecommons.org/licenses/by/3.0/ CC-BY Journal Article VoR - Version of Record 2012 ftunivstirling https://doi.org/10.1371/journal.pone.0043560 2022-06-13T18:45:14Z In Scotland and elsewhere, there are concerns that escaped farmed Atlantic salmon (Salmo salar L.) may impact on wild salmon stocks. Potential detrimental effects could arise through disease spread, competition, or inter-breeding. We investigated whether there is evidence of a direct effect of recorded salmon escape events on wild stocks in Scotland using anglers' counts of caught salmon (classified as wild or farmed) and sea trout (Salmo trutta L.). This tests specifically whether documented escape events can be associated with reduced or elevated escapes detected in the catch over a five-year time window, after accounting for overall variation between areas and years. Alternate model frameworks were somewhat inconsistent, however no robust association was found between documented escape events and higher proportion of farm-origin salmon in anglers' catch, nor with overall catch size. A weak positive correlation was found between local escapes and subsequent sea trout catch. This is in the opposite direction to what would be expected if salmon escapes negatively affected wild fish numbers. Our approach specifically investigated documented escape events, contrasting with earlier studies examining potentially wider effects of salmon farming on wild catch size. This approach is more conservative, but alleviates some potential sources of confounding, which are always of concern in observational studies. Successful analysis of anglers' reports of escaped farmed salmon requires high data quality, particularly since reports of farmed salmon are a relatively rare event in the Scottish data. Therefore, as part of our analysis, we reviewed studies of potential sensitivity and specificity of determination of farmed origin. Specificity estimates are generally high in the literature, making an analysis of the form we have performed feasible. Article in Journal/Newspaper Atlantic salmon Salmo salar University of Stirling: Stirling Digital Research Repository PLoS ONE 7 9 e43560 |
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Open Polar |
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University of Stirling: Stirling Digital Research Repository |
op_collection_id |
ftunivstirling |
language |
English |
description |
In Scotland and elsewhere, there are concerns that escaped farmed Atlantic salmon (Salmo salar L.) may impact on wild salmon stocks. Potential detrimental effects could arise through disease spread, competition, or inter-breeding. We investigated whether there is evidence of a direct effect of recorded salmon escape events on wild stocks in Scotland using anglers' counts of caught salmon (classified as wild or farmed) and sea trout (Salmo trutta L.). This tests specifically whether documented escape events can be associated with reduced or elevated escapes detected in the catch over a five-year time window, after accounting for overall variation between areas and years. Alternate model frameworks were somewhat inconsistent, however no robust association was found between documented escape events and higher proportion of farm-origin salmon in anglers' catch, nor with overall catch size. A weak positive correlation was found between local escapes and subsequent sea trout catch. This is in the opposite direction to what would be expected if salmon escapes negatively affected wild fish numbers. Our approach specifically investigated documented escape events, contrasting with earlier studies examining potentially wider effects of salmon farming on wild catch size. This approach is more conservative, but alleviates some potential sources of confounding, which are always of concern in observational studies. Successful analysis of anglers' reports of escaped farmed salmon requires high data quality, particularly since reports of farmed salmon are a relatively rare event in the Scottish data. Therefore, as part of our analysis, we reviewed studies of potential sensitivity and specificity of determination of farmed origin. Specificity estimates are generally high in the literature, making an analysis of the form we have performed feasible. |
author2 |
Institute of Aquaculture orcid:0000-0001-9026-5675 orcid:0000-0001-8608-6631 orcid:0000-0002-5404-7512 orcid:0000-0003-3544-0519 orcid:0000-0002-3843-9663 orcid:0000-0001-7384-5133 |
format |
Article in Journal/Newspaper |
author |
Green, Darren Penman, David Migaud, Herve Bron, James Taggart, John McAndrew, Brendan |
spellingShingle |
Green, Darren Penman, David Migaud, Herve Bron, James Taggart, John McAndrew, Brendan The Impact of Escaped Farmed Atlantic Salmon (Salmo salar L.) on Catch Statistics in Scotland |
author_facet |
Green, Darren Penman, David Migaud, Herve Bron, James Taggart, John McAndrew, Brendan |
author_sort |
Green, Darren |
title |
The Impact of Escaped Farmed Atlantic Salmon (Salmo salar L.) on Catch Statistics in Scotland |
title_short |
The Impact of Escaped Farmed Atlantic Salmon (Salmo salar L.) on Catch Statistics in Scotland |
title_full |
The Impact of Escaped Farmed Atlantic Salmon (Salmo salar L.) on Catch Statistics in Scotland |
title_fullStr |
The Impact of Escaped Farmed Atlantic Salmon (Salmo salar L.) on Catch Statistics in Scotland |
title_full_unstemmed |
The Impact of Escaped Farmed Atlantic Salmon (Salmo salar L.) on Catch Statistics in Scotland |
title_sort |
impact of escaped farmed atlantic salmon (salmo salar l.) on catch statistics in scotland |
publisher |
Public Library of Science |
publishDate |
2012 |
url |
http://hdl.handle.net/1893/9355 https://doi.org/10.1371/journal.pone.0043560 http://dspace.stir.ac.uk/bitstream/1893/9355/1/journal.pone.0043560.pdf |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
Green D, Penman D, Migaud H, Bron J, Taggart J & McAndrew B (2012) The Impact of Escaped Farmed Atlantic Salmon (Salmo salar L.) on Catch Statistics in Scotland. PLoS ONE, 7 (9), p. e43560. https://doi.org/10.1371/journal.pone.0043560 http://hdl.handle.net/1893/9355 doi:10.1371/journal.pone.0043560 22970132 WOS:000308458400014 2-s2.0-84866078692 761358 http://dspace.stir.ac.uk/bitstream/1893/9355/1/journal.pone.0043560.pdf |
op_rights |
Publisher is open-access. Open access publishing allows free access to and distribution of published articles where the author retains copyright of their work by employing a Creative Commons attribution licence: http://creativecommons.org/licenses/by/2.5/ Proper attribution of authorship and correct citation details should be given. http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0043560 |
container_title |
PLoS ONE |
container_volume |
7 |
container_issue |
9 |
container_start_page |
e43560 |
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1766362362609139712 |