Journal
JOURNAL OF FISH BIOLOGY
Volume 73, Issue 7, Pages 1676-1689Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1095-8649.2008.02041.x
Keywords
critical swimming ability; notothenioid; oxygen consumption; Pagothenia borchgrevinki; thermal acclimation; x-cell disease
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Funding
- Antarctica New Zealand
- Canterbury University
- Kelly Tarlton's Underwater World and Antarctic Attraction
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The Antarctic notothenioid Pagothenia borchgrevinki was collected from the stenothermal waters of McMurdo Sound in the summers of 2004, 2005 and 2006. Acclimation ability at 4 degrees C was tested in healthy P. borchgrevinki and in individuals infected with x-cell gill disease. All healthy fish successfully acclimated to 4 degrees C, establishing compensatory changes in resting oxygen consumption rate (R(rest)) and critical swimming speed (U(crit)) during a 1 month acclimation period, which were maintained during a longer, 6 month acclimation period. In contrast, individuals infected with x-cell disease were unable to acclimate to 4 degrees C, demonstrating significantly reduced survival rates compared with healthy individuals at 4 degrees C. Measurements of R(rest) suggest that limitations in the ability of x-cell fish to uptake oxygen from the external milieu may have a negative effect on their survival at 4 degrees C.
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