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However, mobile ectoparasitic stages can be dislodged during crowding or other procedures, and potentially reinfest farmed or wild fish. We studied vertical movements and host\u2010finding behaviours of mobile salmon lice (\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>Lepeophtheirus salmonis<\/jats:italic>\n                    <\/jats:styled-content>\n                    ) released into the water column, and used those data to parameterise a biophysical dispersal model. Over 0\u20130.4\u2009m in tanks, larger stages sank more quickly than smaller stages (1.5 cf. 0.6\u2009cm\u2009s\n                    <jats:sup>\u22121<\/jats:sup>\n                    ), with sinking speeds of adult lice validated in deeper tanks (0\u20133\u2009m) and a fjord (~15\u201324\u2009m). Adult males had the greatest behavioural component, sinking more slowly with host cues present and faster when dead. Detached lice were able to intercept new hosts in a tank (23% within 5\u2009min). We also investigated\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>Caligus elongatus<\/jats:italic>\n                    <\/jats:styled-content>\n                    , but found their strong swimming not amenable to study. A hydrodynamic dispersal model indicated that detached lice can reach neighbouring cages but rarely neighbouring farms before sinking below cage depth. Simulations comparing farm sites highlighted the influence of site\u2010specific current conditions on dispersal kernels, and indicated that crowding\/handling fish during favourable tides can reduce downstream risk.\n                  <\/jats:p>","DOI":"10.1111\/jfd.14143","type":"journal-article","created":{"date-parts":[[2025,5,10]],"date-time":"2025-05-10T14:18:46Z","timestamp":1746886726000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Behaviour and Dispersal of Mobile Salmon Lice When Detached From the Host"],"prefix":"10.1111","volume":"48","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2820-0421","authenticated-orcid":false,"given":"Luke T.","family":"Barrett","sequence":"first","affiliation":[{"name":"Sustainable Aquaculture Laboratory \u2013 Temperate and Tropical (SALTT), Queenscliff Marine Science Centre Deakin University  Victoria Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mari F.","family":"Jensen","sequence":"additional","affiliation":[{"name":"Oceanography and Climate Institute of Marine Research  Bergen Norway"},{"name":"Bjerknes Centre for Climate Research  Bergen Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sussie","family":"Dalvin","sequence":"additional","affiliation":[{"name":"Pathogens and Disease Transfer Institute of Marine Research  Bergen Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Frode","family":"Oppedal","sequence":"additional","affiliation":[{"name":"Animal Welfare Research Group Institute of Marine Research  Matredal Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,5,10]]},"reference":[{"key":"e_1_2_10_2_1","unstructured":"Albretsen J. 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R.Sivertsg\u00e5rd I.Uglem K.Frank I.Solberg andB.Finstad.2018.\u201cTesting Av Metodikk for \u00c5 Registrere Forekomst Av Lakselus I Oppdrettsanlegg (NINA Rapport 1544).\u201dNorwegian Institute for Nature Research.https:\/\/brage.nina.no\/nina\u2010xmlui\/handle\/11250\/2560987."},{"key":"e_1_2_10_9_1","doi-asserted-by":"publisher","DOI":"10.1023\/A:1007354632039"},{"key":"e_1_2_10_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/0044\u20108486(90)90125\u20107"},{"key":"e_1_2_10_11_1","doi-asserted-by":"publisher","DOI":"10.1111\/jfd.13167"},{"key":"e_1_2_10_12_1","doi-asserted-by":"publisher","DOI":"10.1111\/raq.12528"},{"key":"e_1_2_10_13_1","unstructured":"Codiga D. 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