Table 2.

River of origin for the populations included in the common-environment experiment with latitude of river mouth, mean initial fresh mass (±s.d.) of the fish, number of replicates, duration (days) and year of experiments.

population	latitude (°N)	fresh mass (g)	replicates	duration	year
Imsa	59.0	23.5 (3.4)	6	54	2004
Lone	60.0	6.7 (2.5)	6	61	2005
Gaula	63.2	7.6 (2.7)	6	61	2005
Namsen	64.5	13.2 (5.8)	6	61	2005
Alta	70.0	17.2 (4.8)	10	31	2003