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The data described relate to sea lice monitoring along the coast of British Columbia (BC), Canada from all areas where Atlantic salmon farms are present, spanning over two decades of observations from these farms and adjacent wild Pacific salmonid populations. Around 10,000 mean monthly sea lice estimates are included from almost 100 salmon farms spread across seven \u2018fish health\u2019 zones along the BC coast. Sea lice infestation data from over 365,000 wild hosts, observed as part of almost 17,000 sampling events in these zones, are also reported. While observations were made in the same broad geographical area, temporal coverage varies by zone. These data provide valuable insights into long-term trends, including spatial variability and demographic patterns within the sea lice populations observed on various host species along the BC coast.<\/jats:p>","DOI":"10.1038\/s41597-025-05653-x","type":"journal-article","created":{"date-parts":[[2025,7,31]],"date-time":"2025-07-31T08:39:08Z","timestamp":1753951148000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Sea lice infestation dataset for wild and farmed salmon populations on the Pacific coast of Canada (2001\u20132023)"],"prefix":"10.1038","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5018-0340","authenticated-orcid":false,"given":"Crawford W.","family":"Revie","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4798-066X","authenticated-orcid":false,"given":"Thitiwan","family":"Patanasatienkul","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5959-0576","authenticated-orcid":false,"given":"Gregor","family":"McEwan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Martin","family":"Krko\u0161ek","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lance","family":"Stewardson","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2025,7,31]]},"reference":[{"key":"5653_CR1","doi-asserted-by":"publisher","first-page":"2330","DOI":"10.1098\/rspb.2012.0084","volume":"279","author":"PA Jansen","year":"2012","unstructured":"Jansen, P. 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The Use of Kernel Density Estimation With a Bio-Physical Model Provides a Method to Quantify Connectivity Among Salmon Farms: Spatial Planning and Management With Epidemiological Relevance. Front. Vet. Sci. 5. https:\/\/doi.org\/10.3389\/fvets.2018.00269 (2018).","DOI":"10.3389\/fvets.2018.00269"},{"key":"5653_CR7","doi-asserted-by":"publisher","first-page":"95","DOI":"10.3354\/dao03774","volume":"157","author":"S Ives","year":"2024","unstructured":"Ives, S., Murray, A. & Armstrong, J. Association of ectoparasite Lepeophtheirus salmonis counts on farmed Atlantic salmon and wild sea trout in Scotland. Dis. Aquat. Org. 157, 95\u2013106, https:\/\/doi.org\/10.3354\/dao03774 (2024).","journal-title":"Dis. Aquat. Org."},{"key":"5653_CR8","doi-asserted-by":"publisher","first-page":"1772","DOI":"10.1111\/1365-2664.14712","volume":"61","author":"ML Larsen","year":"2024","unstructured":"Larsen, M. L., Vormedal, I. & Vollset, K. W. 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(a Director of Mainstream Biological Consulting) is hired on a yearly basis by the aquaculture producers in BC (Cermaq Canada, Grieg Seafood BC and MOWI Canada West) to sample wild juvenile salmon for sea lice infestation assessment to fulfill the conditions of license or as part of environmental certification programmes. G.M. was provided with a modest consultation fee from BCSFA to support the incorporation of additional datasets and the documentation of Python coding, requested during the review process for this manuscript. The other authors declare no competing interests.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"1331"}}