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Physiological and endocrine changes in Atlantic salmon smolts during hatchery rearing, downstream migration, and ocean entry

Artikel i vetenskaplig tidskrift
Författare S. D. McCormick
T. F. Sheehan
Björn Thrandur Björnsson
C. Lipsky
J. F. Kocik
A. M. Regish
M. F. O'Dea
Publicerad i Canadian Journal of Fisheries and Aquatic Sciences
Volym 70
Nummer/häfte 1
Sidor 105-118
ISSN 0706-652X
Publiceringsår 2013
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 105-118
Språk en
Länkar dx.doi.org/10.1139/cjfas-2012-0151
Ämnesord growth-hormone levels, pituitary gene-expression, spring chinook salmon, salar post-smolts, coho salmon, oncorhynchus-tshawytscha, factor-i, seawater adaptation, increased daylength, coastal migration
Ämneskategorier Zoologi

Sammanfattning

Billions of hatchery salmon smolts are released annually in an attempt to mitigate anthropogenic impacts on freshwater habitats, often with limited success. Mortality of wild and hatchery fish is high during downstream and early ocean migration. To understand changes that occur during migration, we examined physiological and endocrine changes in Atlantic salmon (Salmo salar) smolts during hatchery rearing, downstream migration, and early ocean entry in two successive years. Gill Na+/K+-ATPase activity increased in the hatchery during spring, increased further after river release, and was slightly lower after recapture in the ocean. Plasma growth hormone levels increased in the hatchery, were higher in the river, and increased further in the ocean. Plasma IGF-I remained relatively constant in the hatchery, increased in the river, then decreased in the ocean. Plasma thyroid hormones were variable in the hatchery, but increased in both river- and ocean-captured smolts. Naturally reared fish had lower condition factor, gill NKA activity, and plasma thyroxine than hatchery fish in the river but were similar in the ocean. This novel data set provides a vital first step in understanding the role and norms of endocrine function in smolts and the metrics of successful marine entry.

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