In order to evaluate the effects of acute temperature exposure on the swimming performance of rainbow trout (Oncorhynchus mykiss), the critical swimming speed (U_crit) and oxygen consumption rates (MO₂) were determined at different temperatures (13.2, 18.4, and 22.5 °C). The U_crit and MO₂ of different body mass (109.44, 175.74, and 249.42 g) fish were also obtained at 13.4 °C. The U_crit first increased as the temperature increased from 13.2 to 15.2 °C, which was calculated to be the optimal temperature for the U_crit, and then decreased with increasing temperature. The optimal swimming speed (U_opt) showed a similar trend to the U_crit. At a given swimming speed, the MO₂ and cost of transport (COT) were significantly higher at 22.5 than at 13.2 °C, suggesting the energy utilization efficiency decreased with increasing temperature. The absolute values of U_crit and U_opt increased as the body mass increased from 109.44 to 249.42 g, whereas the relative values decreased. Although not statistically significant, the maximum metabolic rate (MMR) tended to increase with temperature but decrease with body mass. Results can be of value in understanding the behavioral and physiological response of rainbow trout to acute temperature change.

为了评估急性温度暴露对虹鳟（Oncorhynchus mykiss）游泳性能的影响，确定了在不同温度（13.2、18.4和22.5 ）下的临界游泳速度（U _crit）和耗氧率（MO ₂）。 °C）。在13.4°C下也获得了不同体重（109.44、175.74和249.42 g）鱼的U _crit和MO ₂。当温度从13.2°C升高到15.2°C时，U _crit会先增加，据计算这是U _crit的最佳温度，然后随温度的升高而降低。最佳游泳速度（U_opt）显示了与U_暴击类似的趋势。在给定的游泳速度下，MO ₂和运输成本（COT）在22.5时显着高于13.2°C，这表明能量利用效率随温度升高而降低。当体重从109.44 g增加到249.42 g时，U _crit和U _opt的绝对值增加，而相对值降低。尽管没有统计学上的显着性，但最大代谢率（MMR）倾向于随温度升高而随体重降低。结果对于了解虹鳟对急性温度变化的行为和生理反应具有重要价值。