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However, marine migrations are not without associated costs, including threats posed by ever\u2010increasing salmon lice (<jats:italic>Lepeophtheirus salmonis<\/jats:italic>) infestations. In the present study, we used passive integrated transponder technology to characterize variability in sea trout migration behaviour amongst three catchments situated in a region of intensive salmon farming in central Norway. Specifically, we investigate how lice infestation, out\u2010migration date and body size alter sea trout return rate and marine residence duration during the first out\u2010migration to sea from each catchment. Distinct catchment\u2010specific differences in sea trout out\u2010migration size and the number of cohorts were observed, but larger body size did not guarantee the successful return of migrating trout. The marine residence duration of individuals that successfully returned to freshwater was positively correlated with lice infestation risk, suggesting for these individuals the lethal infestation threshold had not been reached. Our results also suggest that sea trout populations from lotic\u2010dominated catchments are potentially at greater risk from size\u2010related threats to their survival encountered during their marine migrations than sea trout from lentic\u2010dominated catchments. The variability in sea trout migratory behaviour amongst catchments observed here emphasizes the challenges fisheries managers face when deciding the best actions to take to protect the anadromous portion of brown trout populations.<\/jats:p>","DOI":"10.1111\/jfb.14770","type":"journal-article","created":{"date-parts":[[2021,5,4]],"date-time":"2021-05-04T07:34:11Z","timestamp":1620113651000},"page":"875-887","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Factors influencing return rate and marine residence duration in sea trout populations in Central Norway"],"prefix":"10.1111","volume":"99","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0773-0447","authenticated-orcid":false,"given":"Rachel A.","family":"Paterson","sequence":"first","affiliation":[{"name":"The Norwegian Institute for Nature Research  Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4074-3525","authenticated-orcid":false,"given":"Henrik H.","family":"Berntsen","sequence":"additional","affiliation":[{"name":"The Norwegian Institute for Nature Research  Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tor F.","family":"N\u00e6sje","sequence":"additional","affiliation":[{"name":"The Norwegian Institute for Nature Research  Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marius","family":"Berg","sequence":"additional","affiliation":[{"name":"The Norwegian Institute for Nature Research  Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3796-0884","authenticated-orcid":false,"given":"Bengt","family":"Finstad","sequence":"additional","affiliation":[{"name":"The Norwegian Institute for Nature Research  Trondheim Norway"},{"name":"Department of Biology NTNU Centre of Fisheries and Aquaculture  Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,5,24]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.3354\/meps10614"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.3354\/meps11535"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.aquaculture.2019.734511"},{"key":"e_1_2_7_5_1","unstructured":"Anonymous. 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