Effects of warm acclimation on serum osmolality,cortisol and hematocrit levels in the Antarctic fish, <Emphasis Type="Italic">Trematomus bernacchii</Emphasis> |
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Authors: | H A Hudson P R Brauer M A Scofield D H Petzel |
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Institution: | (1) Department of Biomedical Sciences, Creighton University School of Medicine, 2500 California Plaza, Omaha, NE 68178, USA;(2) Department of Pharmacology, Creighton University School of Medicine, 2500 California Plaza, Omaha, NE 68178, USA |
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Abstract: | Antarctic fish, such as the Trematomus bernacchii, living at −1.9°C maintain a serum osmolality of around 600 mOsm kg−1, nearly twice that of temperate fish. Upon warm acclimation, Antarctic fish significantly lower their serum osmolality. It
has been suggested that this response to warm acclimation is due to stress. The purpose of this study was to determine, whether
upon warm acclimation there was a change in the levels of the stress hormone cortisol and hematocrit associated with the decrease
in serum osmolality. T. bernacchii were warm acclimated up to 4 weeks and serum osmolality, cortisol and hematocrit were measured. Upon warm acclimation to
+1.6 and +3.8°C over the course of 4 weeks, T. bernacchii significantly lowered their serum osmolality (from 547 ± 4 mOsm kg−1 to 494 ± 6 and 489 ± 4 mOsm kg−1, respectively), yet did not alter their serum cortisol (29 ± 6 nl ml−1) or hematocrit (22 ± 1%) levels. These results suggest that warm acclimation does not induce a stress response in T. bernacchii. |
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Keywords: | Temperature acclimation Cortisol Osmolality Hematocrit Teleost |
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