What is the value of a dead fish? : the biological and economic impact of delousing farmed Atlantic salmon in Norway
The impacts of the ectoparasite salmon lice (Lepeoptheirus salmonis (Krøyer, 1837)), is a major challenge for sustainable production of farmed Atlantic salmon (Salmo salar) in Norway, and has been so for over 40 years. The challenge with salmon lice, especially the control of it, is the expense and...
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Norwegian University of Life Sciences, Ås
2023
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Online Access: | https://hdl.handle.net/11250/3093058 |
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ftunivmob:oai:nmbu.brage.unit.no:11250/3093058 2023-10-29T02:35:04+01:00 What is the value of a dead fish? : the biological and economic impact of delousing farmed Atlantic salmon in Norway Hva er verdien av en død fisk? : den biologiske og økonomiske betydningen av avlusning av oppdrettet atlantisk laks i Norge Walde, Cecilie Sviland Bang-Jensen, Britt Stormoen, Marit Pettersen, Jostein Mulder Norway 2023 application/pdf https://hdl.handle.net/11250/3093058 eng eng Norwegian University of Life Sciences, Ås PhD Thesis;2023:61 Norges forskningsråd 254830/E40 EC/H2020 101000494 urn:isbn:978-82-575-2090-8 urn:issn:1894-6402 https://hdl.handle.net/11250/3093058 Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no Aquaculture Atlantic salmon Salmon lice mortality growth salmon lice treatments economic impact biological impact non-medicinal delousing treatments thermal delousing treatment mechanical delousing treatment Doctoral thesis 2023 ftunivmob 2023-10-04T22:47:55Z The impacts of the ectoparasite salmon lice (Lepeoptheirus salmonis (Krøyer, 1837)), is a major challenge for sustainable production of farmed Atlantic salmon (Salmo salar) in Norway, and has been so for over 40 years. The challenge with salmon lice, especially the control of it, is the expense and that lice affect different aspects of the economy, environment, and society. Lice have become central to the governmental regulation of the growth of the salmon aquaculture industry, and the most important obstacle to the stated political goal of quintupling aquaculture production in Norway by 2050. The main reason for control is the spillover of lice from farmed to wild salmon. For many years, lice were controlled by use of pesticides. However, they eventually developed resistance to most of the pesticides available. This led to a paradigm shift from treating medicinally to non-medicinally around 2015. Non-medicinal treatments mainly involve the use of heated water baths (thermal treatment) or brushing or flushing (mechanical treatment) of the fish to remove the lice. In 2020, 52 million salmon, 14.8% of the standing stock, died during the on-growing period at sea. It was suspected that a large part of this mortality was caused by non-medicinal treatments. Veterinarians working in the field had, for several years, raised concerns regarding poor fish health and welfare related to especially thermal treatment. Still, at the on-set of this PhD, we did not know how many salmon died because of these treatments, nor how the treatments affected their growth. Securing good health and welfare is part of sustainable animal production and should be a top priority. Yet, when we do not know the extent of mortality and growth loss associated with delousing treatments, it is difficult to assess how much could be spent on measures to reduce mortality and secure good growth. Consequently, it is also difficult to evaluate how highly we should prioritise work related to reducing mortality and securing good growth after treatment. The ... Doctoral or Postdoctoral Thesis Atlantic salmon Salmo salar Open archive Norwegian University of Life Sciences: Brage NMBU |
institution |
Open Polar |
collection |
Open archive Norwegian University of Life Sciences: Brage NMBU |
op_collection_id |
ftunivmob |
language |
English |
topic |
Aquaculture Atlantic salmon Salmon lice mortality growth salmon lice treatments economic impact biological impact non-medicinal delousing treatments thermal delousing treatment mechanical delousing treatment |
spellingShingle |
Aquaculture Atlantic salmon Salmon lice mortality growth salmon lice treatments economic impact biological impact non-medicinal delousing treatments thermal delousing treatment mechanical delousing treatment Walde, Cecilie Sviland What is the value of a dead fish? : the biological and economic impact of delousing farmed Atlantic salmon in Norway |
topic_facet |
Aquaculture Atlantic salmon Salmon lice mortality growth salmon lice treatments economic impact biological impact non-medicinal delousing treatments thermal delousing treatment mechanical delousing treatment |
description |
The impacts of the ectoparasite salmon lice (Lepeoptheirus salmonis (Krøyer, 1837)), is a major challenge for sustainable production of farmed Atlantic salmon (Salmo salar) in Norway, and has been so for over 40 years. The challenge with salmon lice, especially the control of it, is the expense and that lice affect different aspects of the economy, environment, and society. Lice have become central to the governmental regulation of the growth of the salmon aquaculture industry, and the most important obstacle to the stated political goal of quintupling aquaculture production in Norway by 2050. The main reason for control is the spillover of lice from farmed to wild salmon. For many years, lice were controlled by use of pesticides. However, they eventually developed resistance to most of the pesticides available. This led to a paradigm shift from treating medicinally to non-medicinally around 2015. Non-medicinal treatments mainly involve the use of heated water baths (thermal treatment) or brushing or flushing (mechanical treatment) of the fish to remove the lice. In 2020, 52 million salmon, 14.8% of the standing stock, died during the on-growing period at sea. It was suspected that a large part of this mortality was caused by non-medicinal treatments. Veterinarians working in the field had, for several years, raised concerns regarding poor fish health and welfare related to especially thermal treatment. Still, at the on-set of this PhD, we did not know how many salmon died because of these treatments, nor how the treatments affected their growth. Securing good health and welfare is part of sustainable animal production and should be a top priority. Yet, when we do not know the extent of mortality and growth loss associated with delousing treatments, it is difficult to assess how much could be spent on measures to reduce mortality and secure good growth. Consequently, it is also difficult to evaluate how highly we should prioritise work related to reducing mortality and securing good growth after treatment. The ... |
author2 |
Bang-Jensen, Britt Stormoen, Marit Pettersen, Jostein Mulder |
format |
Doctoral or Postdoctoral Thesis |
author |
Walde, Cecilie Sviland |
author_facet |
Walde, Cecilie Sviland |
author_sort |
Walde, Cecilie Sviland |
title |
What is the value of a dead fish? : the biological and economic impact of delousing farmed Atlantic salmon in Norway |
title_short |
What is the value of a dead fish? : the biological and economic impact of delousing farmed Atlantic salmon in Norway |
title_full |
What is the value of a dead fish? : the biological and economic impact of delousing farmed Atlantic salmon in Norway |
title_fullStr |
What is the value of a dead fish? : the biological and economic impact of delousing farmed Atlantic salmon in Norway |
title_full_unstemmed |
What is the value of a dead fish? : the biological and economic impact of delousing farmed Atlantic salmon in Norway |
title_sort |
what is the value of a dead fish? : the biological and economic impact of delousing farmed atlantic salmon in norway |
publisher |
Norwegian University of Life Sciences, Ås |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3093058 |
op_coverage |
Norway |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
PhD Thesis;2023:61 Norges forskningsråd 254830/E40 EC/H2020 101000494 urn:isbn:978-82-575-2090-8 urn:issn:1894-6402 https://hdl.handle.net/11250/3093058 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no |
_version_ |
1781058019415556096 |