Impact of early salmon louse, Lepeophtheirus salmonis, infestation and differences in survival and marine growth of sea‐ranched Atlantic salmon, Salmo salar L., smolts 1997–2009
Abstract The impact of salmon lice on the survival of migrating A tlantic salmon smolts was studied by comparing the adult returns of sea‐ranched smolts treated for sea lice using emamectin benzoate or substance EX with untreated control groups in the R iver D ale in western N orway. A total of 143...
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Online Access: | http://dx.doi.org/10.1111/jfd.12052 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfd.12052 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfd.12052 |
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crwiley:10.1111/jfd.12052 2024-06-23T07:51:24+00:00 Impact of early salmon louse, Lepeophtheirus salmonis, infestation and differences in survival and marine growth of sea‐ranched Atlantic salmon, Salmo salar L., smolts 1997–2009 Skilbrei, O T Finstad, B Urdal, K Bakke, G Kroglund, F Strand, R 2013 http://dx.doi.org/10.1111/jfd.12052 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfd.12052 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfd.12052 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Diseases volume 36, issue 3, page 249-260 ISSN 0140-7775 1365-2761 journal-article 2013 crwiley https://doi.org/10.1111/jfd.12052 2024-05-31T08:14:47Z Abstract The impact of salmon lice on the survival of migrating A tlantic salmon smolts was studied by comparing the adult returns of sea‐ranched smolts treated for sea lice using emamectin benzoate or substance EX with untreated control groups in the R iver D ale in western N orway. A total of 143 500 smolts were released in 35 release groups in freshwater from 1997 to 2009 and in the fjord system from 2007 to 2009. The adult recaptures declined gradually with release year and reached minimum levels in 2007. This development corresponded with poor marine growth and increased age at maturity of ranched salmon and in three monitored salmon populations and indicated unfavourable conditions in the N orwegian S ea. The recapture rate of treated smolts was significantly higher than the controls in three of the releases performed: the only release in 1997, one of three in 2002 and the only group released in sea water in 2007. The effect of treating the smolts against salmon lice was smaller than the variability in return rates between release groups, and much smaller that variability between release years, but its overall contribution was still significant ( P < 0.05) and equivalent to an odds ratio of the probability of being recaptured of 1.17 in favour of the treated smolts. Control fish also tended to be smaller as grilse ( P = 0.057), possibly due to a sublethal effect of salmon lice. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library Journal of Fish Diseases 36 3 249 260 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract The impact of salmon lice on the survival of migrating A tlantic salmon smolts was studied by comparing the adult returns of sea‐ranched smolts treated for sea lice using emamectin benzoate or substance EX with untreated control groups in the R iver D ale in western N orway. A total of 143 500 smolts were released in 35 release groups in freshwater from 1997 to 2009 and in the fjord system from 2007 to 2009. The adult recaptures declined gradually with release year and reached minimum levels in 2007. This development corresponded with poor marine growth and increased age at maturity of ranched salmon and in three monitored salmon populations and indicated unfavourable conditions in the N orwegian S ea. The recapture rate of treated smolts was significantly higher than the controls in three of the releases performed: the only release in 1997, one of three in 2002 and the only group released in sea water in 2007. The effect of treating the smolts against salmon lice was smaller than the variability in return rates between release groups, and much smaller that variability between release years, but its overall contribution was still significant ( P < 0.05) and equivalent to an odds ratio of the probability of being recaptured of 1.17 in favour of the treated smolts. Control fish also tended to be smaller as grilse ( P = 0.057), possibly due to a sublethal effect of salmon lice. |
format |
Article in Journal/Newspaper |
author |
Skilbrei, O T Finstad, B Urdal, K Bakke, G Kroglund, F Strand, R |
spellingShingle |
Skilbrei, O T Finstad, B Urdal, K Bakke, G Kroglund, F Strand, R Impact of early salmon louse, Lepeophtheirus salmonis, infestation and differences in survival and marine growth of sea‐ranched Atlantic salmon, Salmo salar L., smolts 1997–2009 |
author_facet |
Skilbrei, O T Finstad, B Urdal, K Bakke, G Kroglund, F Strand, R |
author_sort |
Skilbrei, O T |
title |
Impact of early salmon louse, Lepeophtheirus salmonis, infestation and differences in survival and marine growth of sea‐ranched Atlantic salmon, Salmo salar L., smolts 1997–2009 |
title_short |
Impact of early salmon louse, Lepeophtheirus salmonis, infestation and differences in survival and marine growth of sea‐ranched Atlantic salmon, Salmo salar L., smolts 1997–2009 |
title_full |
Impact of early salmon louse, Lepeophtheirus salmonis, infestation and differences in survival and marine growth of sea‐ranched Atlantic salmon, Salmo salar L., smolts 1997–2009 |
title_fullStr |
Impact of early salmon louse, Lepeophtheirus salmonis, infestation and differences in survival and marine growth of sea‐ranched Atlantic salmon, Salmo salar L., smolts 1997–2009 |
title_full_unstemmed |
Impact of early salmon louse, Lepeophtheirus salmonis, infestation and differences in survival and marine growth of sea‐ranched Atlantic salmon, Salmo salar L., smolts 1997–2009 |
title_sort |
impact of early salmon louse, lepeophtheirus salmonis, infestation and differences in survival and marine growth of sea‐ranched atlantic salmon, salmo salar l., smolts 1997–2009 |
publisher |
Wiley |
publishDate |
2013 |
url |
http://dx.doi.org/10.1111/jfd.12052 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfd.12052 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfd.12052 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Journal of Fish Diseases volume 36, issue 3, page 249-260 ISSN 0140-7775 1365-2761 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/jfd.12052 |
container_title |
Journal of Fish Diseases |
container_volume |
36 |
container_issue |
3 |
container_start_page |
249 |
op_container_end_page |
260 |
_version_ |
1802642497001750528 |