Fasting and its implications for fish welfare in Atlantic salmon aquaculture
Abstract Periods of fasting occur for a multitude of reasons in Atlantic salmon aquaculture. Feed withdrawal is widely used prior to transport, parasite treatments, preslaughter and for depuration purposes in recirculating aquaculture systems. Voluntary fasting is a coping response when fish have po...
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crwiley:10.1111/raq.12898 2024-03-31T07:51:36+00:00 Fasting and its implications for fish welfare in Atlantic salmon aquaculture Hvas, Malthe Kolarevic, Jelena Noble, Chris Oppedal, Frode Stien, Lars Helge Norges Forskningsråd 2024 http://dx.doi.org/10.1111/raq.12898 https://onlinelibrary.wiley.com/doi/pdf/10.1111/raq.12898 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Reviews in Aquaculture ISSN 1753-5123 1753-5131 Management, Monitoring, Policy and Law Ecology Aquatic Science journal-article 2024 crwiley https://doi.org/10.1111/raq.12898 2024-03-04T13:02:49Z Abstract Periods of fasting occur for a multitude of reasons in Atlantic salmon aquaculture. Feed withdrawal is widely used prior to transport, parasite treatments, preslaughter and for depuration purposes in recirculating aquaculture systems. Voluntary fasting is a coping response when fish have poor health or are exposed to poor farm environments. Owing to increased attention to animal welfare in aquaculture, concerns have been raised regarding ethical issues when farmed fish are subjected to fasting. However, thorough science‐based recommendations for fasting and feed‐withdrawal regimes have been lacking. The purpose of this review is to provide a synthesis of the various causes for fasting in Atlantic salmon aquaculture and evaluate their associated welfare implications so that guidelines for appropriate practices can be formulated. To interpret impacts, we describe biological responses and tolerance limits to fasting in Atlantic salmon and consider adaptations in the wild. Fry and parr are highly sensitive to feed withdrawal. However, post‐smolts and adults are well‐adapted to endure prolonged fasting without experiencing compromised functionality or health. Here, short periods of feed withdrawal prior to operations should therefore not constitute significant welfare concerns. Serious concerns are instead associated with voluntary fasting that may continue for weeks. We emphasize that environmental extremes that exceed appetite impairing thresholds must be avoided. Additionally, farmed fish should not be subjected to practices that lead to chronic stress that induce cessation of appetite. Diseases or parasites that impair appetite should also be mitigated. Fasting is here a symptom rather than a cause for poor welfare. Article in Journal/Newspaper Atlantic salmon Wiley Online Library Reviews in Aquaculture |
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Wiley Online Library |
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language |
English |
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Management, Monitoring, Policy and Law Ecology Aquatic Science |
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Management, Monitoring, Policy and Law Ecology Aquatic Science Hvas, Malthe Kolarevic, Jelena Noble, Chris Oppedal, Frode Stien, Lars Helge Fasting and its implications for fish welfare in Atlantic salmon aquaculture |
topic_facet |
Management, Monitoring, Policy and Law Ecology Aquatic Science |
description |
Abstract Periods of fasting occur for a multitude of reasons in Atlantic salmon aquaculture. Feed withdrawal is widely used prior to transport, parasite treatments, preslaughter and for depuration purposes in recirculating aquaculture systems. Voluntary fasting is a coping response when fish have poor health or are exposed to poor farm environments. Owing to increased attention to animal welfare in aquaculture, concerns have been raised regarding ethical issues when farmed fish are subjected to fasting. However, thorough science‐based recommendations for fasting and feed‐withdrawal regimes have been lacking. The purpose of this review is to provide a synthesis of the various causes for fasting in Atlantic salmon aquaculture and evaluate their associated welfare implications so that guidelines for appropriate practices can be formulated. To interpret impacts, we describe biological responses and tolerance limits to fasting in Atlantic salmon and consider adaptations in the wild. Fry and parr are highly sensitive to feed withdrawal. However, post‐smolts and adults are well‐adapted to endure prolonged fasting without experiencing compromised functionality or health. Here, short periods of feed withdrawal prior to operations should therefore not constitute significant welfare concerns. Serious concerns are instead associated with voluntary fasting that may continue for weeks. We emphasize that environmental extremes that exceed appetite impairing thresholds must be avoided. Additionally, farmed fish should not be subjected to practices that lead to chronic stress that induce cessation of appetite. Diseases or parasites that impair appetite should also be mitigated. Fasting is here a symptom rather than a cause for poor welfare. |
author2 |
Norges Forskningsråd |
format |
Article in Journal/Newspaper |
author |
Hvas, Malthe Kolarevic, Jelena Noble, Chris Oppedal, Frode Stien, Lars Helge |
author_facet |
Hvas, Malthe Kolarevic, Jelena Noble, Chris Oppedal, Frode Stien, Lars Helge |
author_sort |
Hvas, Malthe |
title |
Fasting and its implications for fish welfare in Atlantic salmon aquaculture |
title_short |
Fasting and its implications for fish welfare in Atlantic salmon aquaculture |
title_full |
Fasting and its implications for fish welfare in Atlantic salmon aquaculture |
title_fullStr |
Fasting and its implications for fish welfare in Atlantic salmon aquaculture |
title_full_unstemmed |
Fasting and its implications for fish welfare in Atlantic salmon aquaculture |
title_sort |
fasting and its implications for fish welfare in atlantic salmon aquaculture |
publisher |
Wiley |
publishDate |
2024 |
url |
http://dx.doi.org/10.1111/raq.12898 https://onlinelibrary.wiley.com/doi/pdf/10.1111/raq.12898 |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Reviews in Aquaculture ISSN 1753-5123 1753-5131 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/raq.12898 |
container_title |
Reviews in Aquaculture |
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