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dc.contributor.authorHelland, Ingeborg Palm
dc.contributor.authorUglem, Ingebrigt
dc.contributor.authorJansen, Peder A
dc.contributor.authorDiserud, Ola Håvard
dc.contributor.authorBjørn, Pål Arne
dc.contributor.authorFinstad, Bengt
dc.identifier.citationAquaculture Environment Interactions 2015, 7:267-280nb_NO
dc.description.abstractEcological monitoring programmes should provide precise data to inform management, but the data quality is often limited by methodological challenges and the need for cost-effective sampling. Parasite infestations are particularly challenging to monitor due to complex interactions among hosts, parasites and the environment. In Norway, salmon lice infestations on wild salmonid fish have been monitored since 1992 to survey the potential transmission between farmed and wild salmonids. Here, we compared spatiotemporal variation in salmon lice levels with variations in local fjord conditions, including salinity, temperature and infestation pressure from salmon farms (measured as mean abundance of mature female lice × number of farmed fish). We tested 3 different measures of infestation with different statistical properties. Our results confirm that, even after correcting for temperature and salinity effects, in - festation pressure from salmon farms significantly increases the probability of lice infestation in wild salmonids. The probability of infestation increases with fish body length, salmon farm infestation pressure and tem perature, and decreases with increasing freshwater influence. Furthermore, we found a significant interaction between temperature and infestation pressure from salmon farms. When the infestation pressure from farms is low, temperature has a strong increasing effect on the probability of infestation, but as the infestation pressure from farms increases, temperature gradually becomes less important. The exact results vary somewhat depending on the measure of lice infestations used, but the same trend can be seen in all models. We discuss the statistical and biological complexities that make monitoring of salmon lice in wild populations challenging.nb_NO
dc.rightsNavngivelse-DelPåSammeVilkår 3.0 Norge*
dc.titleStatistical and ecological challengesof monitoring parasitic salmon lice infestationsin wild salmonid fish stocksnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.subject.nsiVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923nb_NO
dc.source.journalAquaculture environment interactionsnb_NO

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