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We combined acoustic telemetry (internal temperature and depth) with satellite\u2010derived sea surface temperature data to quantify Arctic char (\n                    <jats:italic>Salvelinus alpinus<\/jats:italic>\n                    ) responses to MHWs in the coastal Labrador Sea across two contrasting summers: 2023, with frequent early\u2010season MHWs, and 2024, dominated by a late\u2010season event. Using non\u2010MHW detections, we fit seasonal baselines for each fish and calculated temperature and depth anomalies. Char tended to occur in inner habitats (estuaries\/fjords), though 2024 showed greater among\u2010individual variability in outer (coastal\/headland) habitat use. Internal temperatures increased relative to baseline during MHW onset (median +0.64\u00b0C) with modest persistence post\u2010onset (+0.23\u00b0C), whereas depth anomalies showed no consistent departures. Temperature anomalies increased from pre to during MHWs across body sizes and were strongest for larger fish during onset. In contrast, MHW conditions increased the probability of inner\u2010habitat detection primarily for smaller fish after controlling for seasonality. Migration timing differed between years in a size\u2010dependent way, with larger fish leaving the marine environment and entering rivers earlier in 2023. Overall, Arctic char responses did not provide evidence that they sought out thermal refuges during MHWs. However, size\u2010dependent shifts in habitat use and migration timing indicate that MHWs can still alter marine habitat trade\u2010offs, likely through indirect ecological factors (e.g., prey availability). Arctic char responses may intensify, however, when future heatwaves exceed physiological or growth\u2010performance thresholds.\n                  <\/jats:p>","DOI":"10.1111\/jfb.70543","type":"journal-article","created":{"date-parts":[[2026,6,24]],"date-time":"2026-06-24T06:09:46Z","timestamp":1782281386000},"page":"1628-1644","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Marine heatwaves shape size\u2010dependent thermal exposure, habitat use and marine residency in Arctic char (\n                    <i>Salvelinus alpinus<\/i>\n                    )"],"prefix":"10.1111","volume":"109","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8089-4013","authenticated-orcid":false,"given":"Jessica E.","family":"Desforges","sequence":"first","affiliation":[{"name":"Northwest Atlantic Fisheries Centre, Fisheries and Oceans Canada  St. John's Newfoundland and Labrador Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David","family":"C\u00f4t\u00e9","sequence":"additional","affiliation":[{"name":"Northwest Atlantic Fisheries Centre, Fisheries and Oceans Canada  St. John's Newfoundland and Labrador Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joey","family":"Angnatok","sequence":"additional","affiliation":[{"name":"Putjotik Fisheries Ltd.  Nunatsiavut Newfoundland and Labrador Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J. Brian","family":"Dempson","sequence":"additional","affiliation":[{"name":"Northwest Atlantic Fisheries Centre, Fisheries and Oceans Canada  St. John's Newfoundland and Labrador Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0209-543X","authenticated-orcid":false,"given":"Travis E.","family":"Van Leeuwen","sequence":"additional","affiliation":[{"name":"Northwest Atlantic Fisheries Centre, Fisheries and Oceans Canada  St. John's Newfoundland and Labrador Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,6,23]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41598-023-41075-2"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.5194\/wcd-5-1473-2024"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.18637\/jss.v067.i01"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jtherbio.2021.103117"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1093\/ije\/dyt092"},{"key":"e_1_2_9_7_1","volume-title":"Our footprints are everywhere: Inuit land use and occupancy in Labrador","author":"Brice\u2010Bennett C.","year":"1977"},{"key":"e_1_2_9_8_1","volume-title":"The Arctic char fishery of Northern Labrador","author":"Coady L. 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