Factors associated with baseline mortality in Norwegian Atlantic salmon farming

Abstract In 2019, it was estimated that more than 50 million captive Atlantic salmon in Norway died in the final stage of their production in marine cages. This mortality represents a significant economic loss for producers and a need to improve welfare for farmed salmon. Single adverse events, such...

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Autores principales:	Victor H. S. Oliveira, Katharine R. Dean, Lars Qviller, Carsten Kirkeby, Britt Bang Jensen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/935914679e1b4a848bbd355710bcf6f4
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spelling	oai:doaj.org-article:935914679e1b4a848bbd355710bcf6f42021-12-02T17:03:50ZFactors associated with baseline mortality in Norwegian Atlantic salmon farming10.1038/s41598-021-93874-62045-2322https://doaj.org/article/935914679e1b4a848bbd355710bcf6f42021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93874-6https://doaj.org/toc/2045-2322Abstract In 2019, it was estimated that more than 50 million captive Atlantic salmon in Norway died in the final stage of their production in marine cages. This mortality represents a significant economic loss for producers and a need to improve welfare for farmed salmon. Single adverse events, such as algal blooms or infectious disease outbreaks, can explain mass mortality in salmon cages. However, little is known about the production, health, or environmental factors that contribute to their baseline mortality during the sea phase. Here we conducted a retrospective study including 1627 Atlantic salmon cohorts put to sea in 2014–2019. We found that sea lice treatments were associated with Atlantic salmon mortality. In particular, the trend towards non-medicinal sea lice treatments, including thermal delousing, increases Atlantic salmon mortality in the same month the treatment is applied. There were differences in mortality among production zones. Stocking month and weight were other important factors, with the lowest mortality in smaller salmon stocked in August–October. Sea surface temperature and salinity also influenced Atlantic salmon mortality. Knowledge of what affects baseline mortality in Norwegian aquaculture can be used as part of syndromic surveillance and to inform salmon producers on farming practices that can reduce mortality.Victor H. S. OliveiraKatharine R. DeanLars QvillerCarsten KirkebyBritt Bang JensenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Victor H. S. Oliveira Katharine R. Dean Lars Qviller Carsten Kirkeby Britt Bang Jensen Factors associated with baseline mortality in Norwegian Atlantic salmon farming
description	Abstract In 2019, it was estimated that more than 50 million captive Atlantic salmon in Norway died in the final stage of their production in marine cages. This mortality represents a significant economic loss for producers and a need to improve welfare for farmed salmon. Single adverse events, such as algal blooms or infectious disease outbreaks, can explain mass mortality in salmon cages. However, little is known about the production, health, or environmental factors that contribute to their baseline mortality during the sea phase. Here we conducted a retrospective study including 1627 Atlantic salmon cohorts put to sea in 2014–2019. We found that sea lice treatments were associated with Atlantic salmon mortality. In particular, the trend towards non-medicinal sea lice treatments, including thermal delousing, increases Atlantic salmon mortality in the same month the treatment is applied. There were differences in mortality among production zones. Stocking month and weight were other important factors, with the lowest mortality in smaller salmon stocked in August–October. Sea surface temperature and salinity also influenced Atlantic salmon mortality. Knowledge of what affects baseline mortality in Norwegian aquaculture can be used as part of syndromic surveillance and to inform salmon producers on farming practices that can reduce mortality.
format	article
author	Victor H. S. Oliveira Katharine R. Dean Lars Qviller Carsten Kirkeby Britt Bang Jensen
author_facet	Victor H. S. Oliveira Katharine R. Dean Lars Qviller Carsten Kirkeby Britt Bang Jensen
author_sort	Victor H. S. Oliveira
title	Factors associated with baseline mortality in Norwegian Atlantic salmon farming
title_short	Factors associated with baseline mortality in Norwegian Atlantic salmon farming
title_full	Factors associated with baseline mortality in Norwegian Atlantic salmon farming
title_fullStr	Factors associated with baseline mortality in Norwegian Atlantic salmon farming
title_full_unstemmed	Factors associated with baseline mortality in Norwegian Atlantic salmon farming
title_sort	factors associated with baseline mortality in norwegian atlantic salmon farming
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/935914679e1b4a848bbd355710bcf6f4
work_keys_str_mv	AT victorhsoliveira factorsassociatedwithbaselinemortalityinnorwegianatlanticsalmonfarming AT katharinerdean factorsassociatedwithbaselinemortalityinnorwegianatlanticsalmonfarming AT larsqviller factorsassociatedwithbaselinemortalityinnorwegianatlanticsalmonfarming AT carstenkirkeby factorsassociatedwithbaselinemortalityinnorwegianatlanticsalmonfarming AT brittbangjensen factorsassociatedwithbaselinemortalityinnorwegianatlanticsalmonfarming
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Factors associated with baseline mortality in Norwegian Atlantic salmon farming

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