游泳加速模式对南方鲇和团头鲂运动后代谢恢复的影响

为了探讨游泳加速模式对不同生态习性鱼类运动力竭后代谢恢复的影响,采用鱼类游泳呼吸测量仪,在(25±0.5)℃条件下,分别测定南方鲇(Silurus meridionalis)和团头鲂(Megalobrama amblycephala)爆发游泳加速模式(Uburst:Δv为20 cm/s,Δt为2 min)和持续游泳加速模式(Ucrit:Δv为10 cm/s,Δt分别为20、40和60 min)的运动后过量耗氧(EPOC)。结果显示:两种实验鱼的代谢恢复曲线均呈快速恢复和缓慢恢复两个阶段。南方鲇在Uburst后测得的EPOC恢复历时显著高于其它3个加速模式,而团头鲂4个不同处理组的EPOC恢复历时之间的差异均不显著;在相同的加速模式条件下,南方鲇的EPOC恢复历时均短于团头鲂。南方鲇在Uburst后的EPOC总量比3组Ucrit模式下的EPOC总量分别高286.6%、359.5%和816.5%,而团头鲂分别为20.6%、14.8%和29.0%。结果表明:南方鲇运动中对无氧代谢的依赖度高,爆发运动时动用无氧代谢的能力强,可以大幅度提升游泳速度,且运动后代谢恢复时间较短;团头鲂运动中主要依赖有氧代谢,可以保持较长时间的高速游泳,但运动后代谢恢复历时较长。

Effects of acceleration modes on metabolic recovery in Silurus meridionalis and Megalobrama amblycephala after exhaustive swimming

Excess post-exercise oxygen consumption(EPOC)of Silurus meridionalis and Megalobrama amblycephala were measured after burst swimming(Uburst,Δv=20 cm/s,Δt=2 min)or sustained swimming(Ucrit,Δv=10 cm/s,Δt=20,40 and 60 min)by a recirculating swimming flume to investigate the effects of acceleration modes on parameters of metabolic recovery for the fishes with different ecological habits.The water temperature for this experiment was(25±0.5)℃.The results showed that the metabolic recovery curves for both species could be divided into two phases,one was a rapid recovery phase and another was a slow recovery phase.The duration of EPOC in the Uburst group for S.meridionalis was significantly higher than that in each of the other three groups.However,there was no significant difference among the four groups with different acceleration modes for the duration of EPOC of M.amblycephala.In addition,the duration of EPOC of S.meridionalis was shorter than that of M.amblycephala under the same acceleration mode.The magnitude of EPOC in the Uburst group for S.meridionalis was 286.6%,359.5%and 816.5%higher respectively than those in its three Ucrit groups.While the values for M.amblycephala were 20.6%,14.8%and 29.0%,respectively.It suggested that S.meridionalis had a higher dependence on anaerobic metabolism during swimming.The ability of anaerobic metabolism for this species was stronger during burst swimming,which could greatly improve the swimming speed.It could take less time for metabolic recovery after exhaustive swimming.Meanwhile,the swimming of M.amblycephala mainly depends on aerobic metabolism,which can maintain high-speed swimming for a long time.However,the duration of metabolic recovery after exhaustive swimming is longer.