ABSTRACT: Swimming performance of fish is often improved following periods of moderate exercise training. To examine the effects of training regimes on swimming performance of juvenile bream Megalobrama pellegrini (5.10 ± 0.08 g), fish were held in slow-flowing water (control), or subjected to exercise training at 1 body length (BL) s^-1, 2 BL s^-1 or 4 BL s^-1, or were given exhaustive chasing training daily for 5 wk at 25°C. Aerobic swimming performance was assessed by measuring critical swimming speed (U_crit). Maximum metabolic rate (MMR), metabolic scope (MS), cost of transport (COT) and net cost of transport (COT_net) were assessed by measurement of oxygen consumption rates (ṀO₂). U_crit was significantly higher in the 4 BL s^-1 training group than in the controls. The value of U_crit was 5% greater for the exhaustive training group compared with the control group, although exhaustive chasing training did not have a significant effect on U_crit. MMR and MS were not significantly different across treatments.ṀO₂ and COT of fish in the 4 BL s^-1 and exhaustive training groups were significantly lower than in the control group in the swimming speed range of approximately 36-60 cm s^-1. This suggests that high-intensity prolonged exercise training and exhaustive chasing training have a positive influence on the swimming performance of juvenile M. pellegrini, which may be related to elevated anaerobic metabolism and improved swimming efficiency.

中文翻译：

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长时间的运动训练和彻底的追逐训练对濒临灭绝的鲷的游泳性能的影响

摘要：经过中等程度的运动训练后，鱼的游泳性能通常会得到改善。为了检查训练方式对Mega鲷（5.10±0.08 g）游泳行为的影响，将鱼放进慢流水中（对照），或以1体长（BL）s ^-1进行运动训练， 2 BL s ^-1或4 BL s ^-1，或者每天在25°C下进行5 wk的详尽追逐训练。有氧游泳成绩通过测量临界游泳速度（U _crit）进行评估。最大代谢率（MMR），代谢范围（MS），运输成本（COT）和净运输成本（COT_净额））是通过测量耗氧率（O ₂）来评估的。ü_爆击是4 BL S IN显著更高^-1训练组比对照。尽管详尽的追逐训练对U _crit没有显着影响，但力竭训练组的U _crit值比对照组高5％。MMR和MS不显著不同跨treatments.ṀO ₂和鱼的COT在4 BL小号^-1和详尽训练组比在大约36-60厘米S中的游泳速度范围的对照组降低显著^-1。这表明高强度的长时间运动训练和力竭的追逐训练对幼年毛虫的游泳性能有积极的影响，这可能与厌氧代谢升高和游泳效率提高有关。