{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,21]],"date-time":"2026-07-21T04:01:56Z","timestamp":1784606516538,"version":"3.55.0"},"reference-count":37,"publisher":"Wiley","issue":"7","license":[{"start":{"date-parts":[[2021,2,19]],"date-time":"2021-02-19T00:00:00Z","timestamp":1613692800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100005416","name":"Norges Forskningsr\u00e5d","doi-asserted-by":"publisher","award":["254830\/E40"],"award-info":[{"award-number":["254830\/E40"]}],"id":[{"id":"10.13039\/501100005416","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Fish Diseases"],"published-print":{"date-parts":[[2021,7]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>This retrospective descriptive study estimates cage\u2010level mortality distributions after six immediate delousing methods: thermal, mechanical, hydrogen peroxide, medicinal, freshwater and combination of medicinal treatments. We investigated mortality patterns associated with 4\u00a0644 delousing treatment of 1\u00a0837 cohorts of farmed Atlantic salmon (<jats:italic>Salmo salar<\/jats:italic>) stocked in sea along the Norwegian coast between 2014 and 2017. The mortality is expressed as mortality rates. We found distributions of delta mortality rate within 1, 7 and 14\u00a0days after all six delousing treatments, using mortality rate within 7\u00a0days before treatments as baseline. The results show that we can expect increased mortality rates after all six delousing methods. The median delta mortality rates after thermal and mechanical delousing are 5.4 and 6.3 times higher than medicinal treatment, respectively, for the 2017\u00a0year\u2010class. There is a reduction in the delta median mortality for thermal and freshwater delousing from 2015 to 2019. There is a wide variability in the mortality rates, in particular for thermal delousing. Our results suggest that the variability in delta mortality for thermal delousing has been reduced from the 2014 to 2017\u00a0year\u2010class, indicating an improvement of the technique. However, a significant increase in the number of thermal treatments from 14 in 2015 to 738 in 2018 probably contributes to the overall increased mortality in Norwegian salmon farming.<\/jats:p>","DOI":"10.1111\/jfd.13348","type":"journal-article","created":{"date-parts":[[2021,2,21]],"date-time":"2021-02-21T01:40:29Z","timestamp":1613871629000},"page":"899-912","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":60,"title":["Estimating cage\u2010level mortality distributions following different delousing treatments of Atlantic salmon (<i>salmo salar<\/i>) in Norway"],"prefix":"10.1111","volume":"44","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3673-3527","authenticated-orcid":false,"given":"Cecilie","family":"Sviland Walde","sequence":"first","affiliation":[{"name":"Norwegian Veterinary Institute Oslo Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9536-9078","authenticated-orcid":false,"given":"Britt","family":"Bang Jensen","sequence":"additional","affiliation":[{"name":"Norwegian Veterinary Institute Oslo Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jostein Mulder","family":"Pettersen","sequence":"additional","affiliation":[{"name":"PatoGen AS \u00c5lesund Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3385-8762","authenticated-orcid":false,"given":"Marit","family":"Stormoen","sequence":"additional","affiliation":[{"name":"Department of Production Animal Clinical Sciences Faculty of Veterinary Medicine Norwegian University of Life Sciences Oslo Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,2,19]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pt.2014.12.006"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1086\/691981"},{"key":"e_1_2_8_4_1","volume-title":"Forslag til produksjonsomr\u00e5der i norsk lakse\u2010 og \u00f8rretoppdrett","author":"\u00c5dlandsvik B.","year":"2015"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.applanim.2006.09.001"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.prevetmed.2019.104852"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/jfd.13142"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2761.2008.01011.x"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/ps.482"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-2109.2000.00511.x"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.vas.2019.100081"},{"key":"e_1_2_8_12_1","volume-title":"Mekanisk avlusning med FLS\u2010avlusersystem\u2010 dokumentasjon av fiskevelferd og effekt mot lus (Eng. Mechanical delousing using FLS\u2010delousing system \u2010 documentation of fishwefare and effect against lice)","author":"Gismervik K.","year":"2017"},{"key":"e_1_2_8_13_1","volume-title":"Thermal de\u2010licing of salmonid fish\u2010 documentation of fish welfare and effect","author":"Gr\u00f8ntvedt R.","year":"2015"},{"key":"e_1_2_8_14_1","volume-title":"The surveillance programme for resistance in salmon lice (Lepeophtheirus salmonis) in Norway 2019","author":"Helgesen K. O.","year":"2020"},{"key":"e_1_2_8_15_1","volume-title":"Fiskehelserapporten 2017 (Eng. The health situation in Norwegian aquaculture 2017)","author":"Hjeltnes B.","year":"2018"},{"key":"e_1_2_8_16_1","volume-title":"Fiskehelserapporten 2018 (Eng. The health situation in Norwegian aquaculture 2018)","author":"Hjeltnes B.","year":"2019"},{"key":"e_1_2_8_17_1","volume-title":"Kostnadsutvikling i lakseoppdrett \u2010 med fokus p\u00e5 f\u00f4r og lusekostnader (Eng. Development of costs in salmonid aquaculture\u2010 with focus on feed and lice costs) (24\/2017)","author":"Iversen A.","year":"2017"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.aquaculture.2012.09.004"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.prevetmed.2012.08.012"},{"key":"e_1_2_8_20_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.aquaculture.2020.736048"},{"key":"e_1_2_8_21_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0240894"},{"key":"e_1_2_8_22_1","volume-title":"AquaCloud\u2010 The use of artificial intelligence in sea lice management","author":"NCE Seafood Innovation, Norwegian Centres of Expertise","year":"2017"},{"key":"e_1_2_8_23_1","volume-title":"FOR\u20102008\u201006\u201017\u2010822 Forskrift om drift av akvakulturanlegg (akvakulturdriftforskriften) (Eng. Legal act on operation of aquaculture facilities)","author":"NFD (Norwegian Directorate of Fisheries)","year":"2008"},{"key":"e_1_2_8_24_1","volume-title":"FOR\u20102008\u201006\u201017 nr 822: Forskrift om drift av akvakultuanlegg (Eng: Act on operation of aquaculture facilities)","author":"NFD (Norwegian Directorate of Fisheries)","year":"2008"},{"key":"e_1_2_8_25_1","volume-title":"FOR\u20102012\u201005\u20101140 Forskrift om bekjempelse av lakselus i akvakulturanlegg (Eng: Act on control of salmon louse in aquaculture farms)","author":"NFD (Norwegian Directorate of Fisheries)","year":"2012"},{"key":"e_1_2_8_26_1","unstructured":"NFD (Norwegian Directorate of Fisheries)(2017).FOR 2017\u201001\u201016 nr 61: Forskrift om produksjonsomr\u00e5der for akvakultur av matfisk i sj\u00f8 av laks \u00f8rret og regnbue\u00f8rret (produksjonsomr\u00e5deforskriften). (Eng: Act on production zones for aquaculture in the sea of salmon trout and rainbow trout). 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