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dc.contributor.authorMoe, Karina
dc.contributor.authorNæsje, Tor
dc.contributor.authorHaugen, Thrond Oddvar
dc.contributor.authorUlvan, Eva Marita
dc.contributor.authorAronsen, Tonje
dc.contributor.authorSandnes, Tomas
dc.contributor.authorThorstad, Eva Bonsak
dc.date.accessioned2016-03-14T08:45:15Z
dc.date.available2016-03-14T08:45:15Z
dc.date.issued2016-02-02
dc.description.abstractWe compared the within-river movements and distribution of wild and escaped farmed Atlantic salmon Salmo salar before and during spawning in the Namsen river system of Central Norway. A total of 74 wild and 43 escaped farmed salmon were captured at sea, tagged with radio transmitters and released. Based on our examinations, most, if not all salmon (farmed and wild) entering the River Namsen were sexually mature. Farmed salmon entering the river system had a higher probability than wild individuals of reaching the migration barrier in the upper part of the river, 70 km from the sea. During the pre-spawning and spawning periods, farmed salmon were located mainly in the upper parts (50 to 70 km from the sea), whereas wild salmon were evenly distributed along the entire river during both periods. Consequently, the probability of farmed × wild inter-breeding varied among river sections. Our finding that the distribution of escaped farmed salmon may differ from that of wild salmon and among river sections in the prespawning and spawning periods—and that it may also vary over time—must be taken into consideration when (1) designing monitoring programs aimed at estimating the proportion of escaped farmed salmon in rivers and (2) when interpreting monitoring results. Furthermore, targeted fishing in the river aimed at reducing the number of farmed salmon prior to spawning may be more effective in upper rivers sections, and below major migration barriers.en_US
dc.identifier.citationAquaculture Environment Interactions 2016, 8:77-88en_US
dc.identifier.issn1869-7534
dc.identifier.otherFRIDAID 1342979
dc.identifier.other10.3354/aei00165
dc.identifier.urihttp://hdl.handle.net/10037/8914
dc.identifier.urnURN:NBN:no-uit_munin_8508
dc.language.isoengen_US
dc.publisherInter Researchen_US
dc.rights.accessRightsopenAccess
dc.subjectRadio telemetryen_US
dc.subjectFarmed escapeesen_US
dc.subjectWithin-river movementsen_US
dc.subjectPre spawningen_US
dc.subjectSpawning perioden_US
dc.subjectIntrogression risken_US
dc.subjectRiver Namsenen_US
dc.subjectVDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920::Akvakultur: 922en_US
dc.subjectVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922en_US
dc.titleArea use and movement patterns of wild and escaped farmed Atlantic salmon before and during spawning in a large Norwegian riveren_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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