Table 1.

The gross morphological parameters of thermally acclimated rainbow trout

	Cold acclimated (5 °C)	Control (10 °C)	Warm acclimated (18 °C)
Mass (g)	480.8 ± 64.3	526.1 ± 42.8	524.8 ± 60.2
Heart mass (g)	0.94 ± 0.09	1.15 ± 0.12	0.99 ± 0.11
RHM (g mass−1 × 100)	0.21 ± 0.010	0.22 ± 0.0086	0.19 ± 0.0079
Atrial mass (g)	0.12 ± 0.013	0.13 ± 0.02	0.14 ± 0.017
RAM (g mass−1 × 100)	0.027 ± 0.0019	0.023 ± 0.0019	0.026 ± 0.0014

Values given are mean ± S. E. Significance was determined by GLM with Tukey post hoc test for comparison between the groups (P < 0.05), n = 18 for each group

RHM relative heart mass, RAM relative atrial mass