Sea lice infestation levels decrease with deeper ‘snorkel’ barriers in Atlantic salmon sea‐cages
Abstract BACKGROUND Salmon lice ( Lepeophtheirus salmonis ) are the most important parasites of farmed salmon. Infective larvae position themselves in the upper part of the water column to increase encounter probabilities with potential hosts. Previous studies have shown that a ‘snorkel’ sea‐cage te...
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crwiley:10.1002/ps.4560 2024-09-15T17:56:14+00:00 Sea lice infestation levels decrease with deeper ‘snorkel’ barriers in Atlantic salmon sea‐cages Oppedal, Frode Samsing, Francisca Dempster, Tim Wright, Daniel W Bui, Samantha Stien, Lars H The Norwegian Seafood Research Fund 2017 http://dx.doi.org/10.1002/ps.4560 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fps.4560 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ps.4560 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Pest Management Science volume 73, issue 9, page 1935-1943 ISSN 1526-498X 1526-4998 journal-article 2017 crwiley https://doi.org/10.1002/ps.4560 2024-08-15T04:20:01Z Abstract BACKGROUND Salmon lice ( Lepeophtheirus salmonis ) are the most important parasites of farmed salmon. Infective larvae position themselves in the upper part of the water column to increase encounter probabilities with potential hosts. Previous studies have shown that a ‘snorkel’ sea‐cage technology protects salmon from infection in surface waters. We tested whether deep snorkels would more effectively reduce lice infestation than shallow snorkels and still uphold adequate conditions for the fish. Five sea‐cages (12 m × 12 m) each holding approximately 3000 Atlantic salmon ( Salmo salar ) (53 ± 10 g) were fitted with snorkels that gave protection from infection for 0, 4, 8, 12 or 16 m. We tested whether reductions in the settlement of new salmon lice copepodids were consistent among four separate infection periods. RESULTS Lice infestation decreased exponentially with depth in all time periods. Infection levels in shallow snorkels (0 and 4 m) were consistently 4–10 times higher than those in deep snorkels (12 and 16 m). Key welfare and production performance indices were similar across all snorkel depths. CONCLUSION Deeper snorkels dramatically and consistently reduced infection levels of salmon lice compared with shallow snorkels, without consequences for fish welfare and production performance. Therefore, reducing salmon sea lice encounters using a depth‐based barrier is a powerful management tool for salmon farming. © 2017 Society of Chemical Industry Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library Pest Management Science 73 9 1935 1943 |
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Wiley Online Library |
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English |
description |
Abstract BACKGROUND Salmon lice ( Lepeophtheirus salmonis ) are the most important parasites of farmed salmon. Infective larvae position themselves in the upper part of the water column to increase encounter probabilities with potential hosts. Previous studies have shown that a ‘snorkel’ sea‐cage technology protects salmon from infection in surface waters. We tested whether deep snorkels would more effectively reduce lice infestation than shallow snorkels and still uphold adequate conditions for the fish. Five sea‐cages (12 m × 12 m) each holding approximately 3000 Atlantic salmon ( Salmo salar ) (53 ± 10 g) were fitted with snorkels that gave protection from infection for 0, 4, 8, 12 or 16 m. We tested whether reductions in the settlement of new salmon lice copepodids were consistent among four separate infection periods. RESULTS Lice infestation decreased exponentially with depth in all time periods. Infection levels in shallow snorkels (0 and 4 m) were consistently 4–10 times higher than those in deep snorkels (12 and 16 m). Key welfare and production performance indices were similar across all snorkel depths. CONCLUSION Deeper snorkels dramatically and consistently reduced infection levels of salmon lice compared with shallow snorkels, without consequences for fish welfare and production performance. Therefore, reducing salmon sea lice encounters using a depth‐based barrier is a powerful management tool for salmon farming. © 2017 Society of Chemical Industry |
author2 |
The Norwegian Seafood Research Fund |
format |
Article in Journal/Newspaper |
author |
Oppedal, Frode Samsing, Francisca Dempster, Tim Wright, Daniel W Bui, Samantha Stien, Lars H |
spellingShingle |
Oppedal, Frode Samsing, Francisca Dempster, Tim Wright, Daniel W Bui, Samantha Stien, Lars H Sea lice infestation levels decrease with deeper ‘snorkel’ barriers in Atlantic salmon sea‐cages |
author_facet |
Oppedal, Frode Samsing, Francisca Dempster, Tim Wright, Daniel W Bui, Samantha Stien, Lars H |
author_sort |
Oppedal, Frode |
title |
Sea lice infestation levels decrease with deeper ‘snorkel’ barriers in Atlantic salmon sea‐cages |
title_short |
Sea lice infestation levels decrease with deeper ‘snorkel’ barriers in Atlantic salmon sea‐cages |
title_full |
Sea lice infestation levels decrease with deeper ‘snorkel’ barriers in Atlantic salmon sea‐cages |
title_fullStr |
Sea lice infestation levels decrease with deeper ‘snorkel’ barriers in Atlantic salmon sea‐cages |
title_full_unstemmed |
Sea lice infestation levels decrease with deeper ‘snorkel’ barriers in Atlantic salmon sea‐cages |
title_sort |
sea lice infestation levels decrease with deeper ‘snorkel’ barriers in atlantic salmon sea‐cages |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1002/ps.4560 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fps.4560 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ps.4560 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Pest Management Science volume 73, issue 9, page 1935-1943 ISSN 1526-498X 1526-4998 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ps.4560 |
container_title |
Pest Management Science |
container_volume |
73 |
container_issue |
9 |
container_start_page |
1935 |
op_container_end_page |
1943 |
_version_ |
1810432442814693376 |