Warm water treatment increased mortality risk in salmon
Thermal treatment is a controversial method to control sea lice in the Atlantic salmon farming industry. This study aimed to complement the growing evidence base to document the impact of thermal treatments on salmon welfare, behaviour, physiology and health. Here, fish were treated two times (four...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-09-01
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| Series: | Veterinary and Animal Science |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2451943X22000369 |
| _version_ | 1811279469083623424 |
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| author | Samantha Bui Angelico Madaro Jonatan Nilsson Per Gunnar Fjelldal Martin Haugmo Iversen Monica Fengsrud Brinchman Birger Venås Merete Bjørgan Schrøder Lars Helge Stien |
| author_facet | Samantha Bui Angelico Madaro Jonatan Nilsson Per Gunnar Fjelldal Martin Haugmo Iversen Monica Fengsrud Brinchman Birger Venås Merete Bjørgan Schrøder Lars Helge Stien |
| author_sort | Samantha Bui |
| collection | DOAJ |
| description | Thermal treatment is a controversial method to control sea lice in the Atlantic salmon farming industry. This study aimed to complement the growing evidence base to document the impact of thermal treatments on salmon welfare, behaviour, physiology and health. Here, fish were treated two times (four weeks apart) for 30 s in either 27, 30, or 33 °C warm water, and parameters were compared to a procedural control (exposed to their holding temperature of 14 °C) or a negative control (where no treatments were applied). The fish had a clear behavioural response to the warm water, despite low difference between treatment and holding temperature (Δt = 13, 16 or 19 °C). Eye damages were more prevalent in the warm water treated groups than in the controls. Little difference was recorded between treatment groups in their growth and condition factor, blood plasma values, organ health, and long-term coping ability. There was, however, a significant increase in mortality as a function of temperature after the first treatment (14 °C: 6.5%, 27 °C: 5.3%, 30 °C: 12.4% and 33 °C: 18.9% mortality). The first treatment was performed only two weeks after the fish had been tagged and moved into the experimental holding tanks, while the fish had been allowed to recover for four weeks without any handling before the second treatment. The group of fish that were not subjected to any treatments (the negative control) had no mortality throughout the entire experimental period. |
| first_indexed | 2024-04-13T00:56:20Z |
| format | Article |
| id | doaj.art-4582e5c08cd3420da57ec34ee541c232 |
| institution | Directory Open Access Journal |
| issn | 2451-943X |
| language | English |
| last_indexed | 2024-04-13T00:56:20Z |
| publishDate | 2022-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Veterinary and Animal Science |
| spelling | doaj.art-4582e5c08cd3420da57ec34ee541c2322022-12-22T03:09:40ZengElsevierVeterinary and Animal Science2451-943X2022-09-0117100265Warm water treatment increased mortality risk in salmonSamantha Bui0Angelico Madaro1Jonatan Nilsson2Per Gunnar Fjelldal3Martin Haugmo Iversen4Monica Fengsrud Brinchman5Birger Venås6Merete Bjørgan Schrøder7Lars Helge Stien8Animal Welfare research group, Institute of Marine Research, Matre Research Station N-5984 Matredal, NorwayAnimal Welfare research group, Institute of Marine Research, Matre Research Station N-5984 Matredal, NorwayAnimal Welfare research group, Institute of Marine Research, Matre Research Station N-5984 Matredal, NorwayReproduction and Developmental Biology, Institute of Marine Research, Matre Research Station N-5984 Matredal, NorwayFaculty of Biosciences and Aquaculture, Nord University, Postboks 1490, N-8049 Bodø, NorwayFaculty of Biosciences and Aquaculture, Nord University, Postboks 1490, N-8049 Bodø, NorwaySINTEF Ocean, Postboks 4762 Torgard, N-7465 Trondheim, NorwaySINTEF Ocean, Postboks 4762 Torgard, N-7465 Trondheim, NorwayAnimal Welfare research group, Institute of Marine Research, Matre Research Station N-5984 Matredal, Norway; Corresponding author.Thermal treatment is a controversial method to control sea lice in the Atlantic salmon farming industry. This study aimed to complement the growing evidence base to document the impact of thermal treatments on salmon welfare, behaviour, physiology and health. Here, fish were treated two times (four weeks apart) for 30 s in either 27, 30, or 33 °C warm water, and parameters were compared to a procedural control (exposed to their holding temperature of 14 °C) or a negative control (where no treatments were applied). The fish had a clear behavioural response to the warm water, despite low difference between treatment and holding temperature (Δt = 13, 16 or 19 °C). Eye damages were more prevalent in the warm water treated groups than in the controls. Little difference was recorded between treatment groups in their growth and condition factor, blood plasma values, organ health, and long-term coping ability. There was, however, a significant increase in mortality as a function of temperature after the first treatment (14 °C: 6.5%, 27 °C: 5.3%, 30 °C: 12.4% and 33 °C: 18.9% mortality). The first treatment was performed only two weeks after the fish had been tagged and moved into the experimental holding tanks, while the fish had been allowed to recover for four weeks without any handling before the second treatment. The group of fish that were not subjected to any treatments (the negative control) had no mortality throughout the entire experimental period.http://www.sciencedirect.com/science/article/pii/S2451943X22000369Warm water treatmentDelousing treatmentMortality, BehaviourInjuriesStressAtlantic salmon |
| spellingShingle | Samantha Bui Angelico Madaro Jonatan Nilsson Per Gunnar Fjelldal Martin Haugmo Iversen Monica Fengsrud Brinchman Birger Venås Merete Bjørgan Schrøder Lars Helge Stien Warm water treatment increased mortality risk in salmon Veterinary and Animal Science Warm water treatment Delousing treatment Mortality, Behaviour Injuries Stress Atlantic salmon |
| title | Warm water treatment increased mortality risk in salmon |
| title_full | Warm water treatment increased mortality risk in salmon |
| title_fullStr | Warm water treatment increased mortality risk in salmon |
| title_full_unstemmed | Warm water treatment increased mortality risk in salmon |
| title_short | Warm water treatment increased mortality risk in salmon |
| title_sort | warm water treatment increased mortality risk in salmon |
| topic | Warm water treatment Delousing treatment Mortality, Behaviour Injuries Stress Atlantic salmon |
| url | http://www.sciencedirect.com/science/article/pii/S2451943X22000369 |
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