Estimating costs of sea lice control strategy in Norway

Liu, Huan; Bjelland, Hans Vanhauwaert

doi:10.1016/j.prevetmed.2014.08.018

Cited by 94 publications

(65 citation statements)

References 21 publications

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“…Investigation of (i) efficiency, which relates the cost of disease control measures to the benefits, and (ii) acceptability, which is the willingness of persons and organizations to put into action disease control measures, are prerequisites for their applications. Efficiency can be obtained using ex-ante benefit-cost analyses to assess whether the value of expected profits would exceed the cost of a disease control scenario as reported for finfish diseases [105,106]. Acceptability can be estimated with participation rates obtained from survey questionnaires to stakeholders.…”

Section: (B) Building Epidemiological Modelsmentioning

confidence: 99%

Infectious diseases in oyster aquaculture require a new integrated approach

Pernet

Lupo

Bacher

et al. 2016

Phil. Trans. R. Soc. B

120

107

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Emerging diseases pose a recurrent threat to bivalve aquaculture. Recently, massive mortality events in the Pacific oyster Crassostrea gigas associated with the detection of a microvariant of the ostreid herpesvirus 1 (OsHV-1µVar) have been reported in Europe, Australia and New Zealand. Although the spread of disease is often viewed as a governance failure, we suggest that the development of protective measures for bivalve farming is presently held back by the lack of key scientific knowledge. In this paper, we explore the case for an integrated approach to study the management of bivalve disease, using OsHV-1 as a case study. Reconsidering the key issues by incorporating multidisciplinary science could provide a holistic understanding of OsHV-1 and increase the benefit of research to policymakers.

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Section: (B) Building Epidemiological Modelsmentioning

confidence: 99%

Infectious diseases in oyster aquaculture require a new integrated approach

Pernet

Lupo

Bacher

et al. 2016

Phil. Trans. R. Soc. B

120

107

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“…The salmon louse ( Lepeophtheirus salmonis ) has within the last four decades become an extensive problem in Norwegian salmon farming, and the cause of massive expenses every year [1,2]. Salmon lice are naturally occurring marine parasitic copepods that feed on the skin, mucus and blood of their salmonid hosts.…”

Section: Introductionmentioning

confidence: 99%

A selection study on a laboratory-designed population of salmon lice (Lepeophtheirus salmonis) using organophosphate and pyrethroid pesticides

et al. 2017

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Resistance towards antiparasitic agents in the salmon louse (Lepeophtheirus salmonis) is a widespread problem along the Norwegian coast, reducing treatments efficacies and slowing down the envisioned expansion of Norwegian salmon production. The present study was conducted in order to assess the efficacies of two of the most widely used anti-parasitic substances–azamethiphos and deltamethrin–as well as assessing the benefit of having a resistant genotype compared to being fully sensitive when exposed to one of these substances. Atlantic salmon were exposed to a mix of salmon lice copepodids from a fully sensitive, a double resistant and a multi-resistant strain. Once the lice reached pre-adult stages, one group was exposed to 100 μg/L azamethiphos for 60 minutes, the other to 2 μg/L deltamethrin for 30 minutes, and the last was kept in a seawater control. Detached lice were collected at a series of time points following exposure, and all lice (immobilized and surviving) were analysed for both pyrethroid (sensitive “S” and resistant “R”) and azamethiphos (fully sensitive “SS”, heterozygous resistant “RS” and fully resistant “RR”) resistance markers. We found that the efficacies of deltamethrin on parasites with genotype S and R were 70.3 and 13.2%, respectively. The overall efficacy of the deltamethrin treatment was 32.3%. The efficacies of azamethiphos on parasites with genotype SS, RS and RR were 100, 80 and 19.1%, respectively. The overall efficacy of the azamethiphos treatment was 80.4%. Survival analyses revealed that the median survival time in deltamethrin-sensitive and–resistant parasites were 16.8 and >172 hours, respectively. The differences were even more pronounced in the azamethiphos-treated group, where SS, RS and RR parasites survived for 0.26, 6.6 and >172 hours, respectively. The substantial differences in survival between sensitive and resistant lice following treatment demonstrate the ability of medicinal treatments to drive genetic selection towards a much more resistant salmon lice population within a very short time span if there is no influx of sensitive genotypes.

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“…There has been an increasing role for bath treatments, firstly in 2007 using cypermethrin and later with deltamethrin and azamethiphos. Bath treatments are more expensive to apply than in‐feed treatment, and their effect lasts for less time, and so their increased use represents a considerable expense to aquaculture producers. It also raises the potential for environmental contamination .…”

Section: Discussionmentioning

confidence: 99%

“…A particularly serious parasite for marine salmonids is the sea louse, especially Lepeophtheirus salmonis but also various Caligus spp . Although these ectoparasites generally cause relatively little direct mortality when they are properly managed, control is expensive and has been estimated to cost €33 million in Scotland, part of a global cost of €300 million of sea lice to marine salmonid production . Sea louse larvae can be transported several kilometres with water movement, and lice are found in elevated abundance on wild salmonids for up to 30 km from salmon farms …”

Section: Introductionmentioning

confidence: 99%