dc.contributor.author | Moe, Karina | |
dc.contributor.author | Næsje, Tor | |
dc.contributor.author | Haugen, Thrond Oddvar | |
dc.contributor.author | Ulvan, Eva Marita | |
dc.contributor.author | Aronsen, Tonje | |
dc.contributor.author | Sandnes, Tomas | |
dc.contributor.author | Thorstad, Eva Bonsak | |
dc.date.accessioned | 2016-03-14T08:45:15Z | |
dc.date.available | 2016-03-14T08:45:15Z | |
dc.date.issued | 2016-02-02 | |
dc.description.abstract | We 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.citation | Aquaculture Environment Interactions 2016, 8:77-88 | en_US |
dc.identifier.cristinID | FRIDAID 1342979 | |
dc.identifier.doi | 10.3354/aei00165 | |
dc.identifier.issn | 1869-7534 | |
dc.identifier.uri | https://hdl.handle.net/10037/8914 | |
dc.identifier.urn | URN:NBN:no-uit_munin_8508 | |
dc.language.iso | eng | en_US |
dc.publisher | Inter Research | en_US |
dc.rights.accessRights | openAccess | |
dc.subject | Radio telemetry | en_US |
dc.subject | Farmed escapees | en_US |
dc.subject | Within-river movements | en_US |
dc.subject | Pre spawning | en_US |
dc.subject | Spawning period | en_US |
dc.subject | Introgression risk | en_US |
dc.subject | River Namsen | en_US |
dc.subject | VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920::Akvakultur: 922 | en_US |
dc.subject | VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922 | en_US |
dc.title | Area use and movement patterns of wild and escaped farmed Atlantic salmon before and during spawning in a large Norwegian river | en_US |
dc.type | Journal article | en_US |
dc.type | Tidsskriftartikkel | en_US |
dc.type | Peer reviewed | en_US |