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dc.contributor.authorPaterson, Rachel
dc.contributor.authorBerntsen, Johan Henrik Hårdensson
dc.contributor.authorNæsje, Tor
dc.contributor.authorBerg, Marius
dc.contributor.authorFinstad, Bengt
dc.description.abstractBrown trout (Salmo trutta) display extensive plasticity in marine migratory behaviours, with marine migrations considered to be an adaptive strategy which enables sea trout to maximize growth and reproductive potential. However, marine migrations are not without associated costs, including threats posed by ever-increasing salmon lice (Lepeophtheirus salmonis) infestations. In the present study, we used passive integrated transponder technology to characterize variability in sea trout migration behaviour amongst three catchments situated in a region of intensive salmon farming in central Norway. Specifically, we investigate how lice infestation, out-migration date and body size alter sea trout return rate and marine residence duration during the first out-migration to sea from each catchment. Distinct catchment-specific differences in sea trout out-migration size and the number of cohorts were observed, but larger body size did not guarantee the successful return of migrating trout. The marine residence duration of individuals that successfully returned to freshwater was positively correlated with lice infestation risk, suggesting for these individuals the lethal infestation threshold had not been reached. Our results also suggest that sea trout populations from lotic-dominated catchments are potentially at greater risk from size-related threats to their survival encountered during their marine migrations than sea trout from lentic-dominated catchments. The variability in sea trout migratory behaviour amongst catchments observed here emphasizes the challenges fisheries managers face when deciding the best actions to take to protect the anadromous portion of brown trout populations. anadromous, brown trout, Norway, out-migration, salmon liceen_US
dc.rightsNavngivelse-Ikkekommersiell 4.0 Internasjonal*
dc.subjectbrown trouten_US
dc.subjectsalmon liceen_US
dc.titleFactors influencing return rate and marine residence durationin sea trout populations in Central Norwayen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.rights.holder© 2021 The Authors.en_US
dc.subject.nsiVDP::Zoologiske og botaniske fag: 480en_US
dc.subject.nsiVDP::Zoology and botany: 480en_US
dc.source.journalJournal of Fish Biologyen_US
dc.relation.projectAndre: Møre og Romsdal fylkeskommuneen_US
dc.relation.projectEgen institusjon: Norwegian institute for nature research (NINA)en_US
dc.relation.projectAndre: Fylkesmannen i Møre- og Romsdalen_US
dc.relation.projectAndre: Norwegian Environment Agencyen_US
dc.relation.projectAndre: Det Norske Veritasen_US

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Navngivelse-Ikkekommersiell 4.0 Internasjonal
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