Delousing Efficacy and Physiological Impacts on Atlantic Salmon of Freshwater and Hyposaline Bath Treatments
A pilot study was conducted to investigate the delousing efficacy and physiological effects of freshwater and hyposaline water in Atlantic salmon ( Salmo salar ) for various treatment durations. There were four primary treatment groups: salmon lice ( Lepeophtheirus salmonis) infected fish held in se...
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ftimr:oai:imr.brage.unit.no:11250/3063097 2023-06-11T04:10:15+02:00 Delousing Efficacy and Physiological Impacts on Atlantic Salmon of Freshwater and Hyposaline Bath Treatments Thompson, Cameron Madaro, Angelico Oppedal, Frode Stien, Lars Helge Bui, Samantha 2023 application/pdf https://hdl.handle.net/11250/3063097 eng eng Havforskningsinstituttet Rapport fra havforskningen Rapport fra havforskningen;2023 - 11 https://www.hi.no/hi/nettrapporter/rapport-fra-havforskningen-en-2023-11 Havforskningsinstituttet: 15769 https://hdl.handle.net/11250/3063097 cristin:2136633 19 2023 - 11 Research report 2023 ftimr 2023-04-19T22:45:46Z A pilot study was conducted to investigate the delousing efficacy and physiological effects of freshwater and hyposaline water in Atlantic salmon ( Salmo salar ) for various treatment durations. There were four primary treatment groups: salmon lice ( Lepeophtheirus salmonis) infected fish held in seawater (procedural controls), infected fish treated in freshwater (buffered with 1% seawater), uninfected fish treated in freshwater, and infected fish treated with hyposaline water. The ion-modified, hyposaline water (~5 ppt salinity) was created through nano-filtration technology which desalinated seawater. Salmon were held for a period ranging from 30 minutes to 48 hours in their designated treatment bath, lice counts were made before and after treatment to measure efficacy of delousing, and blood samples were taken to investigate the physiological effects on fish. The freshwater treatment had no apparent delousing effect when compared with the seawater group, but just 5% of lice remained on fish after a 4-hour hyposaline treatment. The osmotic balance of fish in the freshwater and hyposaline treatments shifted towards a lower internal concentration of ions with longer bath durations, but the fish recovered once transferred back to seawater. Indicators of stress reflected a less clear pattern with bath duration which may be due to the additional handling stress associated with moving fish between tanks and an elevated stress response triggered by transition back to a freshwater environment. Delousing Efficacy and Physiological Impacts on Atlantic Salmon of Freshwater and Hyposaline Bath Treatments publishedVersion Report Atlantic salmon Salmo salar Institute for Marine Research: Brage IMR |
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Institute for Marine Research: Brage IMR |
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English |
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A pilot study was conducted to investigate the delousing efficacy and physiological effects of freshwater and hyposaline water in Atlantic salmon ( Salmo salar ) for various treatment durations. There were four primary treatment groups: salmon lice ( Lepeophtheirus salmonis) infected fish held in seawater (procedural controls), infected fish treated in freshwater (buffered with 1% seawater), uninfected fish treated in freshwater, and infected fish treated with hyposaline water. The ion-modified, hyposaline water (~5 ppt salinity) was created through nano-filtration technology which desalinated seawater. Salmon were held for a period ranging from 30 minutes to 48 hours in their designated treatment bath, lice counts were made before and after treatment to measure efficacy of delousing, and blood samples were taken to investigate the physiological effects on fish. The freshwater treatment had no apparent delousing effect when compared with the seawater group, but just 5% of lice remained on fish after a 4-hour hyposaline treatment. The osmotic balance of fish in the freshwater and hyposaline treatments shifted towards a lower internal concentration of ions with longer bath durations, but the fish recovered once transferred back to seawater. Indicators of stress reflected a less clear pattern with bath duration which may be due to the additional handling stress associated with moving fish between tanks and an elevated stress response triggered by transition back to a freshwater environment. Delousing Efficacy and Physiological Impacts on Atlantic Salmon of Freshwater and Hyposaline Bath Treatments publishedVersion |
format |
Report |
author |
Thompson, Cameron Madaro, Angelico Oppedal, Frode Stien, Lars Helge Bui, Samantha |
spellingShingle |
Thompson, Cameron Madaro, Angelico Oppedal, Frode Stien, Lars Helge Bui, Samantha Delousing Efficacy and Physiological Impacts on Atlantic Salmon of Freshwater and Hyposaline Bath Treatments |
author_facet |
Thompson, Cameron Madaro, Angelico Oppedal, Frode Stien, Lars Helge Bui, Samantha |
author_sort |
Thompson, Cameron |
title |
Delousing Efficacy and Physiological Impacts on Atlantic Salmon of Freshwater and Hyposaline Bath Treatments |
title_short |
Delousing Efficacy and Physiological Impacts on Atlantic Salmon of Freshwater and Hyposaline Bath Treatments |
title_full |
Delousing Efficacy and Physiological Impacts on Atlantic Salmon of Freshwater and Hyposaline Bath Treatments |
title_fullStr |
Delousing Efficacy and Physiological Impacts on Atlantic Salmon of Freshwater and Hyposaline Bath Treatments |
title_full_unstemmed |
Delousing Efficacy and Physiological Impacts on Atlantic Salmon of Freshwater and Hyposaline Bath Treatments |
title_sort |
delousing efficacy and physiological impacts on atlantic salmon of freshwater and hyposaline bath treatments |
publisher |
Havforskningsinstituttet |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3063097 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
19 2023 - 11 |
op_relation |
Rapport fra havforskningen Rapport fra havforskningen;2023 - 11 https://www.hi.no/hi/nettrapporter/rapport-fra-havforskningen-en-2023-11 Havforskningsinstituttet: 15769 https://hdl.handle.net/11250/3063097 cristin:2136633 |
_version_ |
1768384562798264320 |