The effect of climate related stressors on liver in Atlantic salmon (Salmo salar)
Climate change impacts the average temperature in the world’s oceans, as well as other environmental parameters, such as oxygen levels. These changes are threatening and challenging animals living there, including farmed species. In this trial Atlantic salmon (Salmo salar) were exposed to fluctuatin...
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2023
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ftunivtroemsoe:oai:munin.uit.no:10037/33547 2024-06-23T07:51:22+00:00 The effect of climate related stressors on liver in Atlantic salmon (Salmo salar) Bjerke Kleiv, Mina 2023-05-15 https://hdl.handle.net/10037/33547 eng eng UiT The Arctic University of Norway UiT Norges arktiske universitet https://hdl.handle.net/10037/33547 Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) Copyright 2023 The Author(s) https://creativecommons.org/licenses/by-nc-sa/4.0 BIO-3955 Master thesis Mastergradsoppgave 2023 ftunivtroemsoe 2024-05-29T00:47:55Z Climate change impacts the average temperature in the world’s oceans, as well as other environmental parameters, such as oxygen levels. These changes are threatening and challenging animals living there, including farmed species. In this trial Atlantic salmon (Salmo salar) were exposed to fluctuating temperature (12-17C) as a single stressor, and in combination with lowered level of dissolved oxygen (~70%), to evaluate how combined environmental stressors affect the fish health- and welfare. The two groups exposed to environmental stressors were compared to a control group (12C). In earlier studies, both elevated temperature and lower levels of oxygen have resulted in signs of reduced fish health- and welfare. Combining these stressors, as well as exposing salmon to a fluctuating temperature regime, can provide important knowledge connected to the affect climate related stressors may have on caged salmon, when, for example, a heatwave occurs. In this study the salmon liver was major focus, because this organ can provide important information regarding the overall health- and welfare of the fish. The parameters studied were metabolism, stress, apoptosis, and immune response, as well as growth, scale loss, and gill score. The methods used were histology and gene transcription. In addition, development of a new digital histopathological tool for salmon liver was commenced. Exposing fish to conditions simulating heatwaves, as well as lowered level of dissolved oxygen, resulted in cellular differences and morphological changes in the liver, such as reduction in lipid storage, increased amount of connective tissue, and higher occurrence of melanin spots. Further, these changes may affect the homeostatic balance in the fish, thus causing reduced health and welfare. The fish exposed to environmental stressors combined had the lowest growth-related indicators, as well as the highest score of examined welfare parameters, indicating reduced fish welfare compared to the control group. However, there is a need for further ... Master Thesis Atlantic salmon Salmo salar University of Tromsø: Munin Open Research Archive |
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University of Tromsø: Munin Open Research Archive |
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English |
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BIO-3955 |
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BIO-3955 Bjerke Kleiv, Mina The effect of climate related stressors on liver in Atlantic salmon (Salmo salar) |
topic_facet |
BIO-3955 |
description |
Climate change impacts the average temperature in the world’s oceans, as well as other environmental parameters, such as oxygen levels. These changes are threatening and challenging animals living there, including farmed species. In this trial Atlantic salmon (Salmo salar) were exposed to fluctuating temperature (12-17C) as a single stressor, and in combination with lowered level of dissolved oxygen (~70%), to evaluate how combined environmental stressors affect the fish health- and welfare. The two groups exposed to environmental stressors were compared to a control group (12C). In earlier studies, both elevated temperature and lower levels of oxygen have resulted in signs of reduced fish health- and welfare. Combining these stressors, as well as exposing salmon to a fluctuating temperature regime, can provide important knowledge connected to the affect climate related stressors may have on caged salmon, when, for example, a heatwave occurs. In this study the salmon liver was major focus, because this organ can provide important information regarding the overall health- and welfare of the fish. The parameters studied were metabolism, stress, apoptosis, and immune response, as well as growth, scale loss, and gill score. The methods used were histology and gene transcription. In addition, development of a new digital histopathological tool for salmon liver was commenced. Exposing fish to conditions simulating heatwaves, as well as lowered level of dissolved oxygen, resulted in cellular differences and morphological changes in the liver, such as reduction in lipid storage, increased amount of connective tissue, and higher occurrence of melanin spots. Further, these changes may affect the homeostatic balance in the fish, thus causing reduced health and welfare. The fish exposed to environmental stressors combined had the lowest growth-related indicators, as well as the highest score of examined welfare parameters, indicating reduced fish welfare compared to the control group. However, there is a need for further ... |
format |
Master Thesis |
author |
Bjerke Kleiv, Mina |
author_facet |
Bjerke Kleiv, Mina |
author_sort |
Bjerke Kleiv, Mina |
title |
The effect of climate related stressors on liver in Atlantic salmon (Salmo salar) |
title_short |
The effect of climate related stressors on liver in Atlantic salmon (Salmo salar) |
title_full |
The effect of climate related stressors on liver in Atlantic salmon (Salmo salar) |
title_fullStr |
The effect of climate related stressors on liver in Atlantic salmon (Salmo salar) |
title_full_unstemmed |
The effect of climate related stressors on liver in Atlantic salmon (Salmo salar) |
title_sort |
effect of climate related stressors on liver in atlantic salmon (salmo salar) |
publisher |
UiT The Arctic University of Norway |
publishDate |
2023 |
url |
https://hdl.handle.net/10037/33547 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
https://hdl.handle.net/10037/33547 |
op_rights |
Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) Copyright 2023 The Author(s) https://creativecommons.org/licenses/by-nc-sa/4.0 |
_version_ |
1802642435163029504 |