{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,17]],"date-time":"2025-09-17T16:48:36Z","timestamp":1758127716715},"reference-count":44,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2014,9,26]],"date-time":"2014-09-26T00:00:00Z","timestamp":1411689600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"Icelandic AVS fund","award":["R058 12"],"award-info":[{"award-number":["R058 12"]}]},{"name":"Icelandic Research Council","award":["RAN090303-0389"],"award-info":[{"award-number":["RAN090303-0389"]}]},{"name":"The Research Council of Norway"},{"name":"the Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning","award":["217-2008-1258","223-2011-1356"],"award-info":[{"award-number":["217-2008-1258","223-2011-1356"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Fish Biology"],"published-print":{"date-parts":[[2014,10]]},"abstract":"<jats:p>The effects of a 6 week short\u2010day photoperiod followed by continuous light, applied during the juvenile phase of Arctic charr <jats:italic>Salvelinus alpinus<\/jats:italic> in fresh water on smoltification and on the long\u2010term growth and maturity following transfer to brackish water (<jats:styled-content style=\"fixed-case\">BW<\/jats:styled-content>) (constant salinity of either 17 and 27 or increasing salinity in steps from 17 to 27) were investigated. Prior to salinity transfer, the juveniles were either reared at continuous light (C group) or reared for 6 weeks on a short day (8L:<jats:styled-content style=\"fixed-case\">16D<\/jats:styled-content>, S group) followed by continuous light (24L:<jats:styled-content style=\"fixed-case\">0D<\/jats:styled-content>). Increased salinity had negative effect on growth, with female fish reared at 17 salinity weighing 19 and 27% more than the salinity\u2010step group (17\u201327) and the 27 salinity group, respectively. The stepwise acclimation to salinity had limited advantage in terms of growth rate. Short photoperiod for 6 weeks (November to January) followed by continuous light improved growth, but not seawater (<jats:styled-content style=\"fixed-case\">SW<\/jats:styled-content>) tolerance. Gill Na<jats:sup>+<\/jats:sup>, K<jats:sup>+<\/jats:sup>\u2010<jats:styled-content style=\"fixed-case\">ATPase<\/jats:styled-content> activity and plasma Na<jats:sup>+<\/jats:sup> levels changed with time, indicating some variation in osmoregulatory capacity during the experimental period. Overall, there appear to be interactive effects on maturation from applying short\u2010day photoperiod followed by rearing at higher salinities. Plasma leptin varied with time and may be linked to stress caused by the observed variations in osmoregulatory ability. It is concluded that changes in growth rates observed in this study are mainly related to rearing salinity with higher growth rates at lower salinities. Short\u2010day photoperiod has some growth\u2010inducing effects but did not improve <jats:styled-content style=\"fixed-case\">SW<\/jats:styled-content> tolerance. Farmers of <jats:italic>S. alpinus<\/jats:italic> using <jats:styled-content style=\"fixed-case\">BW<\/jats:styled-content> for land\u2010based rearing should keep salinity at moderate and stable levels according to these results to obtain best growth.<\/jats:p>","DOI":"10.1111\/jfb.12524","type":"journal-article","created":{"date-parts":[[2014,9,26]],"date-time":"2014-09-26T14:57:27Z","timestamp":1411743447000},"page":"1211-1226","source":"Crossref","is-referenced-by-count":7,"title":["Effects of short\u2010day treatment on long\u2010term growth performance and maturation of farmed Arctic charr <i>Salvelinus alpinus<\/i> reared in brackish water"],"prefix":"10.1111","volume":"85","author":[{"given":"S.","family":"Gunnarsson","sequence":"first","affiliation":[{"name":"Akvaplan\u2010niva Iceland Office  Akralind 4 201 K\u00f3pavogur Iceland"},{"name":"Department of Biology University of Bergen, High Technology Centre  5020 Bergen Norway"}]},{"given":"M.","family":"Johansson","sequence":"additional","affiliation":[{"name":"Fish Endocrinology Laboratory, Department of Biological and Environmental Sciences University of Gothenburg  Box 463 S\u201040530 Gothenburg Sweden"}]},{"given":"A.","family":"G\u00fastavsson","sequence":"additional","affiliation":[{"name":"H\u00f3lar University College  551 Sau\u00f0\u00e1rkr\u00f3kur Iceland"}]},{"given":"T.","family":"\u00c1rnason","sequence":"additional","affiliation":[{"name":"Marine Research Institute  Box 42 240 Grindav\u00edk Iceland"}]},{"given":"J.","family":"\u00c1rnason","sequence":"additional","affiliation":[{"name":"Matis ohf, Borgart\u00fan 2  105 Reykjav\u00edk Iceland"}]},{"given":"H.","family":"Sm\u00e1rad\u00f3ttir","sequence":"additional","affiliation":[{"name":"\u00cdslandsbleikja ehf  Akureyri Iceland"}]},{"given":"B. 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