Does the thermal component of warm water treatment inflict acute lesions on Atlantic salmon (Salmo salar)?
Warm water treatment, i.e. exposure to sea water at a temperature of 28–34 °C for 20–30 s, has in recent years been widely used for delousing of Atlantic salmon (Salmo salar) and rainbow trout (Oncorhynchus mykiss) in Norwegian aquaculture. High mortality and various lesions (e.g. injuries and/or bl...
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ftimr:oai:imr.brage.unit.no:11250/2728237 2023-05-15T15:30:15+02:00 Does the thermal component of warm water treatment inflict acute lesions on Atlantic salmon (Salmo salar)? Moltumyr, Lene Gismervik, Kristine Gu, Jinni Gåsnes, Siri Kristine Kristiansen, Tore S Rønnestad, Ivar Nilsson, Jonatan Stien, Lars Helge 2020 application/pdf https://hdl.handle.net/11250/2728237 https://doi.org/10.1016/j.aquaculture.2020.736048 eng eng Aquaculture. 2020, 532 urn:issn:0044-8486 https://hdl.handle.net/11250/2728237 https://doi.org/10.1016/j.aquaculture.2020.736048 cristin:1889053 12 532 Aquaculture 736048 Peer reviewed Journal article 2020 ftimr https://doi.org/10.1016/j.aquaculture.2020.736048 2021-09-23T20:15:58Z Warm water treatment, i.e. exposure to sea water at a temperature of 28–34 °C for 20–30 s, has in recent years been widely used for delousing of Atlantic salmon (Salmo salar) and rainbow trout (Oncorhynchus mykiss) in Norwegian aquaculture. High mortality and various lesions (e.g. injuries and/or bleedings in skin, fins, eyes, brain, and gills) have, however, been reported after industrial warm water treatments. The objective of this study was to reveal whether the thermal component of warm water treatment inflicts acute lesions on Atlantic salmon. The study was conducted by exposing individual, sedated Atlantic salmon post-smolts ( = 1117 ± 250 g) to sea water at a temperature of 34 °C (warm water treatment, n = 40) or 9 °C (control treatment, n = 20) for 30 s, and subsequently conducting welfare indicator scoring and histopathological examination of their skin, fins, eyes, snout, nasal pits/mucosa, palate, gills, thymus, pseudobranch, brain, heart, liver, kidney, pyloric caeca, pancreas, and spleen. The results showed that the prevalence and severity of acute lesions were not significantly different between the two treatment groups, except for higher prevalence of injuries on the caudal (p = 0.002), dorsal (p = 0.002), and right pelvic fins (p = 0.014) in the warm water treatment group. The main cause of these fin injuries may have been a strong behavioural reaction displayed by the fish when exposed to warm water. Possible consequences of fin injuries, the use of anaesthetic, and statistical limitations were discussed. It was concluded that exposure of Atlantic salmon to sea water at a temperature of 34 °C for 30 s did not lead to any statistically significant change in the prevalence of acute lesions except an increase in minor, possibly behaviour-related, fin injuries. Detection of a lower lesion prevalence than was possible in this study, but which may concern many individuals in an industrial setting, requires examination of a larger number of fish. publishedVersion Article in Journal/Newspaper Atlantic salmon Salmo salar Institute for Marine Research: Brage IMR Aquaculture 532 736048 |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
description |
Warm water treatment, i.e. exposure to sea water at a temperature of 28–34 °C for 20–30 s, has in recent years been widely used for delousing of Atlantic salmon (Salmo salar) and rainbow trout (Oncorhynchus mykiss) in Norwegian aquaculture. High mortality and various lesions (e.g. injuries and/or bleedings in skin, fins, eyes, brain, and gills) have, however, been reported after industrial warm water treatments. The objective of this study was to reveal whether the thermal component of warm water treatment inflicts acute lesions on Atlantic salmon. The study was conducted by exposing individual, sedated Atlantic salmon post-smolts ( = 1117 ± 250 g) to sea water at a temperature of 34 °C (warm water treatment, n = 40) or 9 °C (control treatment, n = 20) for 30 s, and subsequently conducting welfare indicator scoring and histopathological examination of their skin, fins, eyes, snout, nasal pits/mucosa, palate, gills, thymus, pseudobranch, brain, heart, liver, kidney, pyloric caeca, pancreas, and spleen. The results showed that the prevalence and severity of acute lesions were not significantly different between the two treatment groups, except for higher prevalence of injuries on the caudal (p = 0.002), dorsal (p = 0.002), and right pelvic fins (p = 0.014) in the warm water treatment group. The main cause of these fin injuries may have been a strong behavioural reaction displayed by the fish when exposed to warm water. Possible consequences of fin injuries, the use of anaesthetic, and statistical limitations were discussed. It was concluded that exposure of Atlantic salmon to sea water at a temperature of 34 °C for 30 s did not lead to any statistically significant change in the prevalence of acute lesions except an increase in minor, possibly behaviour-related, fin injuries. Detection of a lower lesion prevalence than was possible in this study, but which may concern many individuals in an industrial setting, requires examination of a larger number of fish. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Moltumyr, Lene Gismervik, Kristine Gu, Jinni Gåsnes, Siri Kristine Kristiansen, Tore S Rønnestad, Ivar Nilsson, Jonatan Stien, Lars Helge |
spellingShingle |
Moltumyr, Lene Gismervik, Kristine Gu, Jinni Gåsnes, Siri Kristine Kristiansen, Tore S Rønnestad, Ivar Nilsson, Jonatan Stien, Lars Helge Does the thermal component of warm water treatment inflict acute lesions on Atlantic salmon (Salmo salar)? |
author_facet |
Moltumyr, Lene Gismervik, Kristine Gu, Jinni Gåsnes, Siri Kristine Kristiansen, Tore S Rønnestad, Ivar Nilsson, Jonatan Stien, Lars Helge |
author_sort |
Moltumyr, Lene |
title |
Does the thermal component of warm water treatment inflict acute lesions on Atlantic salmon (Salmo salar)? |
title_short |
Does the thermal component of warm water treatment inflict acute lesions on Atlantic salmon (Salmo salar)? |
title_full |
Does the thermal component of warm water treatment inflict acute lesions on Atlantic salmon (Salmo salar)? |
title_fullStr |
Does the thermal component of warm water treatment inflict acute lesions on Atlantic salmon (Salmo salar)? |
title_full_unstemmed |
Does the thermal component of warm water treatment inflict acute lesions on Atlantic salmon (Salmo salar)? |
title_sort |
does the thermal component of warm water treatment inflict acute lesions on atlantic salmon (salmo salar)? |
publishDate |
2020 |
url |
https://hdl.handle.net/11250/2728237 https://doi.org/10.1016/j.aquaculture.2020.736048 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
12 532 Aquaculture 736048 |
op_relation |
Aquaculture. 2020, 532 urn:issn:0044-8486 https://hdl.handle.net/11250/2728237 https://doi.org/10.1016/j.aquaculture.2020.736048 cristin:1889053 |
op_doi |
https://doi.org/10.1016/j.aquaculture.2020.736048 |
container_title |
Aquaculture |
container_volume |
532 |
container_start_page |
736048 |
_version_ |
1766360688999006208 |