中华倒刺鲃幼鱼游泳运动功率曲线模型分析

Analysis of Power Curve Model on Swimming Locomotion in Qingbo(Spinibarbus sinensis)

为探讨鱼类游泳运动的生理机制和功率适应对策,在25℃条件下,对中华倒刺鲃(Spinibarbus sinensis)幼鱼临界游泳速度(Ucrit)和力竭后过量耗氧值(EPOC)进行测定并对功率曲线进行回归分析。结果发现:随着游泳速度的增加,中华倒刺鲃的耗氧率(MO2)显著上升(p<0.05),其幂函数和指数回归方程分别为:MO2=222.97+0.148U2.204(R2=0.894,n=61,p<0.01)和MO2=167.00e0.036U(R2=0.895,n=61,p<0.01);力竭运动后耗氧率显著上升并立即达到峰值(MO2peak),然后迅速回落到平稳状态(p<0.05),进入慢速氧债偿还期,其负指数回归方程为:MO2=280.99+984.35e-0.193 T(R2=0.907,n=140,p<0.01)。研究表明中华倒刺鲃是一种有氧代谢能力较强而无氧运动能力较弱的鱼,它的活跃代谢(MO2active)与EPOC峰值(MO2peak)相当,这应与该鱼较低的营养等级、自由觅食方式及活跃的生态习性相关。

To investigate the physiological mechanism and power adaptive strategy of swimming locomotion, we measured the critical swimming speed （Ucirt） and excess post-exercise oxygen consumption （EPOC） of juvenile qingbo （Spinibarbus sinen- sis）, and analyzed their power curve models. The results found that the oxygen consumption rate （Mo2 ） increased significantly with the increase of the swimming speed in juvenile qingbo （p~ 0.05） and the relationship between Mo2 and swimming speed （U） could be described as： Ado2 =222.97＋0.148U2.204（R2 = 0.894, n= 61, p% 0.01） and M% = 167.00U（R2 = 0. 895, n= 61, p〈 0.01）, respectively. After exhaustive exercise,the Mo2 increased significantly and immediately reached the peak values （Mo2peak ） , then, it resumed quickly to a steady state and thus turn into so called ＇ slow oxygen debt repayment pe- riod＇ （p%0.05）. The study showed that qingbo had a strong aerobic but weak anaerobic metabolic ability. The Mo2active during critical swimming speed was similar to the Mo2p^ak elicited by exhaustive exercise. The locomotive strategy may relate to its low predator stress and active foraging mode in field.