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dc.contributor.authorThorstad, EB
dc.contributor.authorDavidsen, Jan Grimsrud
dc.contributor.authorØkland, F.
dc.contributor.authorRikardsen, Audun H.
dc.contributor.authorHalttunen, Elina
dc.contributor.authorLetcher, B.H,
dc.contributor.authorSkardhamar, Jofrid
dc.contributor.authorNæsje, Tor
dc.date.accessioned2010-03-09T13:19:02Z
dc.date.available2010-03-09T13:19:02Z
dc.date.issued2009-12-03
dc.description.abstractTo study smolt behaviour and survival of a northern Atlantic salmon (Salmo salar) population during river descent, sea entry and fjord migration, 120 wild S. salar were tagged with acoustic tags and registered at four automatic listening station arrays in the mouth of the North Norwegian River Alta and throughout the Alta Fjord. An estimated 75% of the post-smolts survived from the river mouth, through the estuary and the first 17 km of the fjord. Survival rates in the fjord varied with body length, and ranged from 97.0–99.5% per km. On average, the post-smolts spent 1.5 days (36 h, range 11–365 h) travelling from the river mouth to the last fjord array, 31 km from the river mouth. The migratory speed was slower (1.8 bl sec-135 ) in the first 4 km after sea entry compared to the next 27 km (3.0 bl sec-136 ). Post-smolts entered the fjord more often during the high or ebbing tide (70%). There was no clear diurnal migration pattern within the river and fjord, but most of the post-smolts entered the fjord at night (66%, 2000–0800 hours), despite the 24 h daylight at this latitude. The tidal cycle, wind-induced currents and the smolts‟ own movements seemed to influence migratory speeds and routes in different parts of the fjord. A large variation in migration patterns, both in river and fjord, might indicate that individuals in stochastic estuarine and marine environments are exposed to highly variable selection regimes resulting in different responses to environmental factors on both temporal and spatial scales. Post-smolts in northern Alta Fjord had similar early marine survival rates to those observed previously in southern fjords; however fjord residency in the north was shorter.en
dc.descriptionThis is the accepted version (authors' final draft post review) of the paper, reprinted with permission. Published version available at <a href=http://dx.doi.org/10.1111/j.1095-8649.2009.02423.x>http://dx.doi.org/10.1111/j.1095-8649.2009.02423.x</a>en
dc.format.extent442084 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.citationJournal of Fish Biology 75(2009) nr. 7 s. 1700-1718en
dc.identifier.cristinIDFRIDAID 488737
dc.identifier.doiDOI: 10.1111/j.1095-8649.2009.02423.x
dc.identifier.issn0022-1112
dc.identifier.urihttps://hdl.handle.net/10037/2431
dc.identifier.urnURN:NBN:no-uit_munin_2181
dc.language.isoengen
dc.publisherWiley-Blackwellen
dc.rights.accessRightsopenAccess
dc.subjectVDP::Matematikk og naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488en
dc.subjectVDP::Landbruks- og fiskerifag: 900::Fiskerifag: 920::Ressursbiologi: 921en
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488en
dc.subjectVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921en
dc.subjectsea entryen
dc.subjectdiurnal migrationen
dc.subjecthorizontal distributionen
dc.subjectmigratory speeden
dc.subjectacoustic telemetryen
dc.subjectProgram MARKen
dc.titleMigratory behaviour and survival rates of wild northern Atlantic salmon (Salmo salar) post-smolts: effects of environmental factorsen
dc.typeJournal articleen
dc.typeTidsskriftartikkelen
dc.typePeer revieweden


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