Salinity effects on plasma ion levels, cortisol, and osmolality in Chinook salmon following lethal sampling Public Deposited

http://ir.library.oregonstate.edu/concern/articles/r494vm97n

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Elsevier and can be found at:  http://www.journals.elsevier.com/comparative-biochemistry-and-physiology-part-a-molecular-and-integrative-physiology/

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  • Studies on hydromineral balance in fishes frequently employ measurements of electrolytes following euthanasia. We tested the effects of fresh- or salt-water euthanasia baths of tricaine mesylate (MS-222) on plasma magnesium (Mg²⁺) and sodium (Na⁺) ions, cortisol and osmolality in fish exposed to saltwater challenges, and the ion and steroid hormone fluctuations over time following euthanasia in juvenile spring Chinook salmon (Oncorhynchus tshawytscha). Salinity of the euthanasia bath affected plasma Mg²⁺ and Na⁺ concentrations as well as osmolality, with higher concentrations in fish euthanized in saltwater. Time spent in the bath positively affected plasma Mg²⁺ and osmolality, negatively affected cortisol, and had no effect on Na⁺ concentrations. The difference of temporal trends in plasma Mg²⁺ and Na⁺ suggests that Mg²⁺ may be more sensitive to physiological changes and responds more rapidly than Na⁺. When electrolytes and cortisol are measured as endpoints after euthanasia, care needs to be taken relative to time after death and the salinity of the euthanasia bath
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  • Stewart, H. A., Noakes, D. L., Cogliati, K. M., Peterson, J. T., Iversen, M. H., & Schreck, C. B. (2016). Salinity effects on plasma ion levels, cortisol, and osmolality in Chinook salmon following lethal sampling. Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 192, 38-43. doi:10.1016/j.cbpa.2015.11.011
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