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为考察鲤科鱼类种内个体标准代谢率的差异及其与运动性能和摄食性能的内在关联,本研究以我国广泛分布的鲤(Cyprinids cardio)幼鱼[体重(4.79±0.08)g,n=36]为实验对象,在(25.0±1.0)℃下分别测量实验鱼的标准代谢率(SMR),随后测定单尾鱼的特殊动力作用(SDA)、自发运动、临界游泳速度以及活跃代谢率(MO2active)。实验鱼标准代谢率(SMR)的变幅为76.7~317.6 mg/(kg·h),其变异系数(CV)达24.4%;实验鱼在10 min内的尾鳍摆动次数(P<0.05)和摄食代谢峰值(P<0.05)均与标准代谢率(SMR)呈正相关;活跃代谢率(MO2active)(P<0.05)与摄食代谢峰值以及活跃代谢范围与摄食代谢范围(P<0.05)均呈正相关。然而,鲤幼鱼的标准代谢率(SMR)与相对临界游泳速度、活跃代谢率(MO2active)、特殊动力作用(SDA)时间和特殊动力作用(SDA)总量均不相关(所有P>0.05)。研究表明,较高标准代谢率(SMR)的鲤幼鱼个体表现较高的活跃性和较强的摄食代谢能力,可能有助于其更易发现食物、逃避天敌以及加快食物处理。
In order to investigate the difference of individual standard metabolic rate among carp species and its intrinsic relationship with exercise performance and feeding performance, the present study was based on the distribution of Cyprinids cardio juveniles [body weight (4.79 ± 0.08) g, n = 36], the standard metabolic rate (SMR) of experimental fish was measured at (25.0 ± 1.0) ℃, and then the SDA, spontaneous movement, critical swimming speed and active metabolic rate (MO2active). The coefficient of variation (CV) of experimental fish was between 76.7-317.6 mg / (kg · h) and the coefficient of variation (CV) was 24.4%. The number of tail fin oscillations (P <0.05) Metabolic peak value (P <0.05) was positively correlated with standard metabolic rate (SMR). MO2active (P <0.05) was positively correlated with peak food intake, active metabolic range and dietary metabolic range (P <0.05). However, the standard metabolic rate (SMR) of juvenile common carp did not correlate with relative critical swimming speed, MO2active, SDA, and SDA (all P> 0.05) . Studies have shown that individuals with higher standard metabolic rate (SMR) performance in juvenile carp exhibit higher activity and greater metabolic capacity for feeding, which may help make it easier to find food, evade predators and speed up food processing.