The Growth of Brown Trout (Salmo Trutta Linn.)

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Abstract
1. Two-year-old trout were grown in controlled environmental conditions in water of different temperatures. 2. The specific growth rates of trout living at different constant temperatures and of those living in water of changing temperature were high between 7 and 9°C. and between 16 and 19°C., and were low above, between and below these temperatures. The existence of these two growth rate maxima may be explained by a differential effect of temperature on the amount of food eaten and the activity of the fish, the former being maximal between 10 and 19°C. and the latter between 10 and 12°C. The efficiency of utilization of the food was low when the temperature was low and also when the activity was high. 3. The maintenance requirements of trout of equal weight increased with increase in temperature. The relation followed a sigmoid curve, which may be explained by a differential effect of temperature on the basal metabolism and on the activity of the trout.