First published online July 6, 2005
Journal of Experimental Biology 208, 2683-2692 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01669
The effects of acclimation to reversed seasonal temperatures on the swimming performance of adult brown trout Salmo trutta
N. Day* and
P. J. Butler
School of Biosciences, The University of Birmingham, Edgbaston,
Birmingham B15 2TT, UK

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Fig. 1. The annual variation in day length and water temperature at Leadmill Trout
Farm, from where stocks of adult brown trout were obtained, and the periods
when all experiments were performed. Arrows indicate start of the acclimation
periods, width of columns indicate experimental periods and height of columns
indicate seasonal temperatures.
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Fig. 2. Mean values (± S.E.M.) of glycogen
concentrations in red muscle, white muscle and liver of adult brown trout
sampled at rest or after swimming up to their critical swimming speed
(Ucrit). For the appropriate comparisons, values with the
same letters are not significantly different from one another
(P<0.05; N=12).
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Fig. 3. Mean values (± S.E.M.) of free
glucose concentrations in red muscle, white muscle and liver of adult brown
trout sampled at rest or after swimming to critical swimming speed
(Ucrit). For the appropriate comparisons, values with the
same letters are not significantly different from one another
(P<0.05; N=12).
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Fig. 4. Mean values (± S.E.M.) of total
lipid levels in red muscle and white muscle of adult brown trout sampled at
rest or after swimming to critical swimming speed (Ucrit).
For the appropriate comparisons, values with the same letters are not
significantly different from one another (P<0.05;
N=12).
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Fig. 5. Mean values (± S.E.M.) of lactate
and ammonia concentrations in red muscle and white muscle of adult brown trout
sampled at rest or after swimming to critical swimming speed
(Ucrit). For the appropriate comparisons, values with same
letters are not significantly different from one another (P<0.05;
N=12).
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© The Company of Biologists Ltd 2005