Abstract
Abstract Brook trout (Salvelinus fontinalis) at age 5 weighed from 65 g to 1,751 g in 23 mountain lakes located in Banff, Jasper, and Waterton Lakes national parks in Alberta. Lake area ranged from 2.2 hectares to 2,065 hectares, maximum depths from 2 m to 96 m, and elevation from 1,019 m to 2,347 m above sea level. For the 23 lakes, there were significant positive correlations between the weight of age-5 fish and the natural logarithm of amphipod densities (r = 0.73), the specific conductance of the waters (r = 0.63), and the midsummer water temperature (r = 0.55). There was a significant negative correlation between fish weight and lake elevation (r = −0.63). Analyses of brook trout stomach contents from 18 lakes indicated a cause-and-effect relationship between fish growth and amphipod abundance. A stepwise multiple regression analysis attributed 54% of the lake-to-lake variation in brook trout growth to amphipod density, 11% to maximum depth, and 7% to specific conductance. From regression analyses, s...
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