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Furthermore, physiological samples were collected from North Sea houting and from resident and anadromous populations of the closely related European whitefish (Coregonus lavaretus (Linnaeus, 1758)) to compare hypo-osmotic tolerances. On average, North Sea houting spent 193 days at sea where the mortality was 36%. Most fish returned from sea in the autumn, and river entry correlated inversely with river temperature and positively with discharge. Fish spent an average of 49 days in the estuarine area. Artificial lakes negatively affected migration speeds. Migration speeds did not differ consistently between individuals (i.e., not a repeatable trait) but correlated positively with water temperature. Fish arrived at spawning areas in November. In the post-spawning state, Na<jats:sup>+<\/jats:sup>\/K<jats:sup>+<\/jats:sup>-ATPase activities were elevated in North Sea houting and anadromous whitefish compared with resident whitefish, while osmolality was elevated only in North Sea houting. Our study provides important information for conservation planning related to the Habitat Directive of the European Union that lists the North Sea houting as critically endangered. <\/jats:p>","DOI":"10.1139\/cjz-2019-0045","type":"journal-article","created":{"date-parts":[[2019,10,17]],"date-time":"2019-10-17T21:52:59Z","timestamp":1571349179000},"page":"1126-1136","update-policy":"https:\/\/doi.org\/10.1139\/csp-crossmark-policy","source":"Crossref","is-referenced-by-count":6,"title":["Investigating fish migration, mortality, and physiology to improve conservation planning of anadromous salmonids: a case study on the endangered North Sea houting (<i>Coregonus oxyrinchus<\/i>)"],"prefix":"10.1139","volume":"97","author":[{"given":"M.","family":"Hertz","sequence":"first","affiliation":[{"name":"Department of Chemistry and Bioscience, Section of Biology and Environmental Science, Aalborg University, Fredrik Bajers Vej 7H, 9220 Aalborg \u00d8, Denmark."}]},{"given":"L.F.","family":"Jensen","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Bioscience, Section of Biology and Environmental Science, Aalborg University, Fredrik Bajers Vej 7H, 9220 Aalborg \u00d8, Denmark."}]},{"given":"C.","family":"Pertoldi","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Bioscience, Section of Biology and Environmental Science, Aalborg University, Fredrik Bajers Vej 7H, 9220 Aalborg \u00d8, Denmark."},{"name":"Aalborg Zoo, M\u00f8lleparkvej 63, 9000, Aalborg, Denmark."}]},{"given":"K.","family":"Aarestrup","sequence":"additional","affiliation":[{"name":"National Institute of Aquatic Resources, Technical University of Denmark, Vejls\u00f8vej 39, 8600 Silkeborg, Denmark."}]},{"given":"S.N.","family":"Thomsen","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Bioscience, Section of Biology and Environmental Science, Aalborg University, Fredrik Bajers Vej 7H, 9220 Aalborg \u00d8, Denmark."}]},{"given":"A.K.O.","family":"Alstrup","sequence":"additional","affiliation":[{"name":"Department of Nuclear Medicine and PET Center, Institute of Clinical Medicine, Aarhus University Hospital, N\u00f8rrebrogade 44, 10C, 8000 Aarhus, Denmark."}]},{"given":"H.","family":"Asmus","sequence":"additional","affiliation":[{"name":"Alfred Wegener Institute, Hafenstra\u00dfe 43, D-25992 List, Sylt, Germany."}]},{"given":"S.S.","family":"Madsen","sequence":"additional","affiliation":[{"name":"Department of Biology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark."}]},{"given":"J.C.","family":"Svendsen","sequence":"additional","affiliation":[{"name":"National Institute of Aquatic Resources, Technical University of Denmark, J\u00e6gersborg Alle 1, 2920, Denmark."}]}],"member":"155","reference":[{"key":"refg1\/ref1","doi-asserted-by":"publisher","DOI":"10.1023\/A:1017074011007"},{"key":"refg2\/ref2","doi-asserted-by":"publisher","DOI":"10.1034\/j.1600-0633.2003.00027.x"},{"key":"refg3\/ref3","doi-asserted-by":"publisher","DOI":"10.1139\/f00-164"},{"key":"refg4\/ref4","doi-asserted-by":"publisher","DOI":"10.3354\/meps10614"},{"key":"refg5\/ref5","doi-asserted-by":"publisher","unstructured":"Aarestrup, K., Baktoft, H., Thorstad, E., Svendsen, J., H\u00f6jesj\u00f6, J., and Koed, A. 2015. 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