Thermal dependence of swimming endurance in juvenile brown trout

The maximum swimming stamina of hatchery reared juvenile brown troutSalmo trutta, swimming against a fixed‐velocity water flow of 36·6 cm s‐1(6·97Ls‐1), was achieved at 16·1° C, and a 90% performance level occurred over a breadth of 7·7° C (12·2–19·9° C). The wide range of temperatures at which swimming performance is close to the maximal capacity could be a consequence of the implications for survival of this function.