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Acoustic telmetry was utilized to study the marine migration of sea trout post\u2010smolts from three populations in a relatively pristine subarctic fjord system. While at sea, the sea trout spent a substantial part of their time close to their natal river, preferred near shore over pelagic habitats and were strongly surface oriented. Despite a fidelity towards local areas, the sea trout utilized various parts of the fjord system, with maximum dispersion &gt;30\u2009km and total migration distance &gt;300\u2009km. Almost half of the sea trout (44%) migrated between river outlets, indicating that a metapopulation approach may be appropriate when managing neighbouring sea trout populations at high latitudes. Furthermore, the different populations displayed different migratory behaviours in terms of distance migrated, dispersion from origin and the likelihood of leaving their home area. This variation in migratory behaviour is likely influenced by spatiotemporal differences in habitat quality between sites, indicating that local habitat variations may promote population\u2010specific behavioural responses even in relatively confined fjord systems.<\/jats:p>","DOI":"10.1111\/jfb.14832","type":"journal-article","created":{"date-parts":[[2021,6,29]],"date-time":"2021-06-29T03:21:26Z","timestamp":1624936886000},"page":"1280-1291","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Sea trout <i>Salmo trutta<\/i> in the subarctic: home\u2010bound but large variation in migratory behaviour between and within populations"],"prefix":"10.1111","volume":"99","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9456-3976","authenticated-orcid":false,"given":"John Fredrik","family":"Str\u00f8m","sequence":"first","affiliation":[{"name":"Institute of Marine Research  Troms\u00f8 Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jenny L. 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