Low temperatures typical of winter cage-site conditions in Atlantic Canada impact the growth, physiology, health and welfare of Atlantic salmon (Salmo salar)
Limited research has been conducted on the physiology of Atlantic salmon (Salmo salar) at cold temperatures despite significant mortalities during the winter at sea-cages in Atlantic Canada. Thus, in this thesis, I exposed post-smolt cultured Atlantic salmon to a seasonal decline in temperature from...
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ftmemorialuniv:oai:research.library.mun.ca:15938 2023-10-01T03:54:42+02:00 Low temperatures typical of winter cage-site conditions in Atlantic Canada impact the growth, physiology, health and welfare of Atlantic salmon (Salmo salar) Vadboncoeur, Émile 2023-02 application/pdf https://research.library.mun.ca/15938/ https://research.library.mun.ca/15938/1/converted.pdf en eng Memorial University of Newfoundland https://research.library.mun.ca/15938/1/converted.pdf Vadboncoeur, Émile <https://research.library.mun.ca/view/creator_az/Vadboncoeur=3A=C9mile=3A=3A.html> (2023) Low temperatures typical of winter cage-site conditions in Atlantic Canada impact the growth, physiology, health and welfare of Atlantic salmon (Salmo salar). Masters thesis, Memorial University of Newfoundland. thesis_license Thesis NonPeerReviewed 2023 ftmemorialuniv 2023-09-03T06:50:30Z Limited research has been conducted on the physiology of Atlantic salmon (Salmo salar) at cold temperatures despite significant mortalities during the winter at sea-cages in Atlantic Canada. Thus, in this thesis, I exposed post-smolt cultured Atlantic salmon to a seasonal decline in temperature from 8 to 1°C (at 1°C week-1), and a ‘cold-shock’ from 3 to 0°C for 4 or 24 hours. During the seasonal decline in temperature, feeding decreased starting at 6°C (and ceased by 1-2°C), osmoregulatory changes and increases in heat shock protein expression began at 4-5°C, and at 1°C elevated plasma cortisol levels indicative of mild stress were measured. The ‘cold-shocks’ resulted in a relatively small stress response (i.e., increases in plasma cortisol and glucose), but no other adverse effects or mortalities. Nonetheless, a number of mortalities/moribund fish were noted when various groups of Atlantic salmon were held for long periods at < 8°C. Moribund fish were lethargic and swam erratically, had enlarged livers and plasma enzymes suggestive of liver damage, and developed ulcers to the head/jaw. The former symptoms are indicative of ‘Winter Syndrome’ described in gilthead sea bream (Sparus aurata) aquaculture, and these ulcers have previously been observed in Norway and associated with tenacibaculosis. Thesis Atlantic salmon Salmo salar Memorial University of Newfoundland: Research Repository Canada Norway |
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Memorial University of Newfoundland: Research Repository |
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English |
description |
Limited research has been conducted on the physiology of Atlantic salmon (Salmo salar) at cold temperatures despite significant mortalities during the winter at sea-cages in Atlantic Canada. Thus, in this thesis, I exposed post-smolt cultured Atlantic salmon to a seasonal decline in temperature from 8 to 1°C (at 1°C week-1), and a ‘cold-shock’ from 3 to 0°C for 4 or 24 hours. During the seasonal decline in temperature, feeding decreased starting at 6°C (and ceased by 1-2°C), osmoregulatory changes and increases in heat shock protein expression began at 4-5°C, and at 1°C elevated plasma cortisol levels indicative of mild stress were measured. The ‘cold-shocks’ resulted in a relatively small stress response (i.e., increases in plasma cortisol and glucose), but no other adverse effects or mortalities. Nonetheless, a number of mortalities/moribund fish were noted when various groups of Atlantic salmon were held for long periods at < 8°C. Moribund fish were lethargic and swam erratically, had enlarged livers and plasma enzymes suggestive of liver damage, and developed ulcers to the head/jaw. The former symptoms are indicative of ‘Winter Syndrome’ described in gilthead sea bream (Sparus aurata) aquaculture, and these ulcers have previously been observed in Norway and associated with tenacibaculosis. |
format |
Thesis |
author |
Vadboncoeur, Émile |
spellingShingle |
Vadboncoeur, Émile Low temperatures typical of winter cage-site conditions in Atlantic Canada impact the growth, physiology, health and welfare of Atlantic salmon (Salmo salar) |
author_facet |
Vadboncoeur, Émile |
author_sort |
Vadboncoeur, Émile |
title |
Low temperatures typical of winter cage-site conditions in Atlantic Canada impact the growth, physiology, health and welfare of Atlantic salmon (Salmo salar) |
title_short |
Low temperatures typical of winter cage-site conditions in Atlantic Canada impact the growth, physiology, health and welfare of Atlantic salmon (Salmo salar) |
title_full |
Low temperatures typical of winter cage-site conditions in Atlantic Canada impact the growth, physiology, health and welfare of Atlantic salmon (Salmo salar) |
title_fullStr |
Low temperatures typical of winter cage-site conditions in Atlantic Canada impact the growth, physiology, health and welfare of Atlantic salmon (Salmo salar) |
title_full_unstemmed |
Low temperatures typical of winter cage-site conditions in Atlantic Canada impact the growth, physiology, health and welfare of Atlantic salmon (Salmo salar) |
title_sort |
low temperatures typical of winter cage-site conditions in atlantic canada impact the growth, physiology, health and welfare of atlantic salmon (salmo salar) |
publisher |
Memorial University of Newfoundland |
publishDate |
2023 |
url |
https://research.library.mun.ca/15938/ https://research.library.mun.ca/15938/1/converted.pdf |
geographic |
Canada Norway |
geographic_facet |
Canada Norway |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
https://research.library.mun.ca/15938/1/converted.pdf Vadboncoeur, Émile <https://research.library.mun.ca/view/creator_az/Vadboncoeur=3A=C9mile=3A=3A.html> (2023) Low temperatures typical of winter cage-site conditions in Atlantic Canada impact the growth, physiology, health and welfare of Atlantic salmon (Salmo salar). Masters thesis, Memorial University of Newfoundland. |
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thesis_license |
_version_ |
1778522565524848640 |