The swimming performance of juvenile rock carp (Procypris rabaudi, Tchang) subjected to repeated fatigue exercise was studied using a flume‐type respirometer at 20°C. The critical swimming speed (U_crit) and oxygen consumption rate (MO₂) of juvenile rock carp were measured during two successive stepped velocity tests, following a 60 min rest interval. U_crit of rock carp was giving a recovery ratio (R_r) of 92.64%, and exertion exercise decreases U_crit. When MO₂ was plotted as a linear function of U, the slope for trial 1 was 1.06 and 1.50 for trial 2, indicating a decreasing in swimming efficiency. The maximum metabolic rate (MMR) increased from 17.06 ± 1.14 mmol O₂/(kg·hr) to 19.14 ± 1.23 mmol O₂/(kg·hr), and the exercise post oxygen consumption rate (EPOC) increased from 9.00 to 9.65 mmol O₂/kg. Repeated fatiguing exercise increased both the aerobic and anaerobic cost of reaching U_crit, but anaerobic metabolism accounted for a larger proportion in the trial 2. The data investigation on the swimming performance and the physiological response to fatigue provide important design criteria for fishways.

中文翻译：

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反复运动疲劳对幼年鲤鱼游泳性能的影响（Procypris rabaudi，Tchang）

少年岩鲤（的游动性能岩原鲤使用水槽型呼吸在20经受反复疲劳的运动，为tchang）进行了研究℃。休息60分钟后，在两个连续的步进速度测试中测量了幼年鲤鱼的临界游泳速度（U _crit）和耗氧率（MO ₂）。鲤鱼的U_暴击恢复率（R _r）为92.64％，而运动锻炼可降低U_暴击。当将MO ₂绘制为U的线性函数时，试验1的斜率是1.06，试验2的斜率是1.50，表明游泳效率下降。最大代谢率（MMR）从17.06±1.14 mmol O ₂ /（kg·hr）增加到19.14±1.23 mmol O ₂ /（kg·hr），运动后耗氧率（EPOC）从9.00增加到9.65 mmol O ₂ / kg。重复进行疲劳运动会增加达到U_暴击的有氧和无氧成本，但无氧代谢在试验2中所占比例较大。游泳性能和对疲劳的生理反应的数据研究为鱼道提供了重要的设计标准。