Long-term hypo-osmoregulatory capacity in downstream migrating Atlantic salmon Salmo salar L. smolts
作者： H. A. Urke , J. V. Arnekleiv , T. O. Nilsen , K. J. Nilssen , L. Rønning
DOI: 10.1111/JFB.12508
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摘要: The duration of hypo-osmoregulatory capacity in downstream migrating Atlantic salmon Salmo salar L smolts previously stocked as startfed young-of-the year (YOY) parr was tested the River Dalaa from mid-May to late-June 1999. Hypo-osmoregulatory capacity, measured plasma osmolality and chloride, assessed after seawater (SW) challenge tests (168 h, salinity = 35). All S. exhibited sufficient at initiation migration mid-May. Migrating caught retained fresh water displayed no signs de-smoltification they maintained through June. This indicates a physiological smolt window that lasts minimum 6 weeks (330 degree days; D°) for hatchery-produced YOY parr. Based on observed river speeds, it can be assumed entered SW 2-4 upper parts Dalaa. Hence, based tolerance, is suggested stocking viable enhancement strategy
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