“…The most commonly studied of these fitness-related traits are locomotor performance, in terms of maximum burst speed or endurance/stamina (Walton, 1988;Kolok, 1992;Austin & Schaffer, 1992;Gibson & Johnston, 1995;Gregory & Wood, 1998;Kolok et al, 1998), and aerobic metabolism, in terms of maximum oxygen consumption rates (Hayes & Chappell, 1990;Friedman et al, 1992;Chappell et al, 1995), field metabolic rate (Berteaux et al, 1996;Peterson et al, 1998), resting metabolic rate (DeVera & Hayes, 1995) and SMR (O'Connor et al, 2000). To my knowledge, this is the first study to examine the consistency of individual variation in aerobic metabolism (SMR) over time during a period of sustained growth (the salmon increasing 20-fold in mass between measurements) and the first during a period when a key life history decision (early/delayed migration in Atlantic salmon) is being made.…”