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dc.contributor.authorSkardhamar, Jofrid
dc.contributor.authorFagerli, Margrethe Nilsen
dc.contributor.authorReigstad, Marit
dc.contributor.authorSandvik, Anne Dagrun
dc.contributor.authorBjørn, Pål Arne
dc.date.accessioned2020-05-26T09:28:07Z
dc.date.available2020-05-26T09:28:07Z
dc.date.issued2019-12-19
dc.description.abstractRisk of mortality of wild salmon caused by salmon lice is used as an index for managing aquaculture production in Norway and is based on monitoring of lice attached to wild salmonids and modelled concentrations of lice larvae in fjords. Direct sampling of lice from Norwegian waters to determine concentrations has never been published scientifically and has been considered non-feasible for monitoring purposes. Here we tested 4 different methods for sampling planktonic salmon lice copepodids. Salmon lice were found using all 4 methods with highly variable concentrations related to volume of filtered water with the different methods and patchy and variable distribution of lice within the fjords. Comparison between modelled and sampled lice concentrations showed variability within the same range and aspects of patchiness, and that the modelled concentrations were mostly lower than observed. We conclude that planktonic salmon lice can be sampled in Norwegian fjords with standard zooplankton sampling methods. Development of monitoring programmes of planktonic lice is possible but will demand a large amount of resources if implemented along the entire coast, because extensive sampling programmes and manpower for analysing samples are required to be able to capture the high spatiotemporal variability and patchy distribution of salmon lice. This calls for further development and use of modelling as a primary tool for national monitoring and management purposes. For further investigations of the effects of infestation pressure on wild salmonids, sampling combined with numerical modelling can provide valuable information.en_US
dc.identifier.citationSkardhamar JS, Fagerli, Reigstad M, Sandvik AD, Bjørn Pa. Sampling planktonic salmon lice in Norwegian fjords. Aquaculture Environment Interactions. 2019;11:701-715en_US
dc.identifier.cristinIDFRIDAID 1765312
dc.identifier.doihttps://doi.org/10.3354/aei00342
dc.identifier.issn1869-215X
dc.identifier.issn1869-7534
dc.identifier.urihttps://hdl.handle.net/10037/18379
dc.language.isoengen_US
dc.publisherInter Researchen_US
dc.relation.journalAquaculture Environment Interactions
dc.relation.projectIDFramsenteret: MIKONen_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/?/239142/Norway/?/?/en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2019 The Author(s)en_US
dc.subjectVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922en_US
dc.subjectVDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920::Akvakultur: 922en_US
dc.subjectVDP::Mathematics and natural science: 400en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400en_US
dc.titleSampling planktonic salmon lice in Norwegian fjordsen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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