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J. Fish. Aquat. Sci."],"published-print":{"date-parts":[[2026,1,1]]},"abstract":"<jats:p>The catadromous thinlip grey mullet ( Chelon ramada (Risso, 1827)) undertakes extensive upstream migrations into freshwater, but knowledge of its movement strategies and fidelity to these habitats remains limited. This study used long-term passive integrated transponder (PIT) and acoustic telemetry in the Mondego River basin (Portugal) to examine fine-scale spatial and temporal movement. Between 2017 and 2018, 1067 individuals were PIT-tagged, and monitored 16\u2009km upstream from the tidal limit. In the first year, 17.43% were detected; after 5 years, 4% still returned (annual decline rate 2.7%\/year), indicating strong freshwater fidelity in some individuals, independent of size. Acoustic tracking of 30 adults (2019\u20132020) revealed predominant use of Tidal\/Freshwater (60%) and Midstream Freshwater habitats (23%), with rapid movements between these habitats and the Lower Estuary (9%). Three movement profiles emerged: longer residents within a single habitat type, directional migrants transitioning between zones, and irregular commuters. Several individuals remained in estuarine zones year-round, providing the first direct evidence that a fraction of the adult population forgoes annual spawning migrations, revealing greater life-history flexibility than previously understood.<\/jats:p>","DOI":"10.1139\/cjfas-2025-0268","type":"journal-article","created":{"date-parts":[[2026,2,24]],"date-time":"2026-02-24T17:30:37Z","timestamp":1771954237000},"page":"1-12","update-policy":"https:\/\/doi.org\/10.1139\/csp-crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Evidence of freshwater habitat fidelity for the catadromous thinlip grey mullet (\n                    <i>Chelon ramada<\/i>\n                    (Risso, 1827))"],"prefix":"10.1139","volume":"83","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2863-6575","authenticated-orcid":false,"given":"Esmeralda","family":"Pereira","sequence":"first","affiliation":[{"name":"Universidade de \u00c9vora","place":["\u00c9vora, 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