Table 1.

Physical characteristics of all adult zebrafish from Group 1 used for enzyme activity and gene expression measurements and Group 2 used for swimming performance and muscle metabolite measurements

All fish	Group	Weight (g)	Length (cm)	Condition factor, k
Control	1	0.55 ± 0.03 (36)	3.31 ± 0.06 (31)	1.52 ± 0.05 (31)
	2	0.41 ± 0.01 (29)‡	2.84 ± 0.04 (29)‡	1.74 ± 0.09 (29)
Cold acclimatized	1	0.58 ± 0.02 (33)	3.29 ± 0.04 (33)	1.61 ± 0.04 (33)
	2	0.52 ± 0.02 (30)*	3.07 ± 0.06 (30)*‡	1.79 ± 0.06 (30)
Exercise trained	1	0.48 ± 0.02 (32)†	3.00 ± 0.04 (32)*†	1.77 ± 0.05 (32)
	2	0.54 ± 0.03 (26)*	3.13 ± 0.05 (26)*‡	1.81 ± 0.09 (26)

The total number of individuals in each category appears in parentheses. Values are means ±s.e.m.

^*Significantly different from controls from the same group

^†significantly different from cold acclimatized from the same group

^‡significantly different from the same treatment in group 1 (P < 0.05).