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dc.contributor.authorSerra Llinares, Rosa Maria
dc.contributor.authorBøhn, Thomas
dc.contributor.authorKarlsen, Ørjan
dc.contributor.authorNilsen, Rune
dc.contributor.authorFreitas, Carla
dc.contributor.authorAlbretsen, Jon
dc.contributor.authorHaraldstad, Tormod
dc.contributor.authorThorstad, Eva Bonsak
dc.contributor.authorElvik, Kristine Marit Schrøder
dc.contributor.authorBjørn, Pål Arne
dc.date.accessioned2020-07-03T06:26:17Z
dc.date.available2020-07-03T06:26:17Z
dc.date.issued2020-02-06
dc.description.abstractBrown trout <i>Salmo trutta</i> (L.) is a facultative anadromous species, where a portion of individuals in populations with access to the sea perform migrations to use the richer feeding resources. We investigated the effect of salmon lice <i>Lepeophtheirus salmonis</i> (Krøyer 1837) infestation on the survival and behaviour of wild trout post-smolts (average fork length = 180 mm) during their marine migration. Comparisons of the marine migratory behaviour were made between an artificially infested group (n = 74) and a control group (n = 71) in an area with low natural lice infestation pressure. Artificial infestation was estimated to cause 100% prevalence and a mean intensity of 65 lice fish<sup>-1</sup> (mean relative intensity of 2.4 lice g<sup>-1</sup> fish). Survival analysis showed limited statistical power but revealed lice-induced mortality, with an estimated hazard ratio of 2.73 (95% CI = 1.04-7.13) compared to the control group, when data from a previous pilot study were included. Surviving individuals in the infested group additionally responded by residing closer to fresh water while at sea, and by prematurely returning to fresh water. On average, infested fish returned to fresh water after only 18 d at sea, while control fish spent on average 100 d at sea. The residency in the inner part of the fjord and the premature return to fresh water represent an adaptive behavioural response to survive the infestation, at the probable cost of reduced growth opportunities and compromised future fitness.en_US
dc.identifier.citationSerra Llinares RM, Bøhn T, Karlsen ØK, Nilsen R, Freitas CMA, Albretsen J, Haraldstad T, Thorstad EB, Elvik KMS, Bjørn Pa. Impacts of salmon lice on mortality, marine migration distance and premature return in sea trout. Marine Ecology Progress Series. 2020;635:151-168en_US
dc.identifier.cristinIDFRIDAID 1796019
dc.identifier.doi10.3354/meps13199
dc.identifier.issn0171-8630
dc.identifier.issn1616-1599
dc.identifier.urihttps://hdl.handle.net/10037/18755
dc.language.isoengen_US
dc.publisherInter Researchen_US
dc.relation.journalMarine Ecology Progress Series
dc.relation.projectIDHavforskningsinstituttet: 14650en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2020 The Author(s)en_US
dc.subjectVDP::Matematikk og naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497en_US
dc.subjectVDP::Mathematics and natural scienses: 400::Zoology and botany: 480::Marine biology: 497en_US
dc.titleImpacts of salmon lice on mortality, marine migration distance and premature return in sea trouten_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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