温度和流速对齐口裂腹鱼幼鱼呼吸代谢的影响

Effects of Temperature and Flow Velocity on the Respiratory Metabolism of Schizothorax prenanti Juveniles

通过流水式呼吸仪研究了齐口裂腹鱼(Schizothorax prenanti)幼鱼在不同水温(11,15,20,23℃)和流速(0.00,0.10,0.30,0.50m/s)环境下的呼吸代谢.研究发现,齐口裂腹鱼幼鱼呼吸代谢率(MR)和单位体重呼吸代谢率(MR′)都随着温度的升高而增大.在11～23℃之间,代谢率的变幅为0.85～7.21mg/h,单位体重代谢率的变幅为350.81～1858.16mg/(kg·h).回归方程MR=a.mb能够较好的描述4个温度水平的幼鱼代谢率与体重之间的关系(p<0.05),体重指数b随着温度的升高而降低.并且在11～23℃之间,幼鱼的代谢率与温度、体重间的关系可通过模型MR=0.525m0.788.e0.033T(R2=0.907,p<0.05,n=32)较好地表征.在0.00,0.10,0.30,0.50m/s4个流速下裂腹鱼幼鱼呼吸代谢率的波动范围为0.59～2.35mg/h,单位体重代谢率波动范围为469.93～1281.56mg/(kg.h).各流速平均代谢率的大小顺序为0.937mg/h(0.10m/s)<1.089mg/h(0.00m/s)<1.104mg/h(0.30m/s)<1.760mg/h(0.50m/s).单位体重代谢率随流速的增大而增大,并且在0.50m/s时,齐口裂腹鱼幼鱼的呼吸代谢率(993.00mg/(kg.h))和单位体重呼吸代谢率都显著高于其他流速组(p<0.01),而其他3组差异不显著.

This study was conducted to determine the effects of water temperature （11,15,20,23℃, respectively） and flow velocity （0.00,0.10,0.30,0.50 m/s, respectively） on the respiratory metabolism of Sclizothorax prenanti juveniles and a continuous-flow respirometry system was employed in this study. The results showed that both the metabolic rate （MR） and the metabolic rate per unit weight （MR＇） increased with the temperature during 11℃ to 23℃, with the amplitude in the range of 0.85-7.21 mg/h for MR and 350.81-1 858.16 mg/（kg.h） for MR＇. The regression function MR=a·mb was found to bet- ter understand the relationship between the metabolic rate （MR） and the weight of Schizothorax prenanti juveniles within the temperatures of 11-23℃. And the body index b was found to decrease with the increase of temperature. Moreover, the model MR=0. 525m^0.788, e0.033T accorded well with the observations when explaining the relationships among metabolic rates （MR）, body weight and temperature for Schizothorax prenanti juveniles（R2 =0. 907,p〈0.05,n=32）. According to linear regression, the metabolic rate （MR） of the young Schizothorax prenanti at different flow velocities augumented with the flow velocities, ranging from 0.59 to 2.35 mg/h and the size order of the mean MR at different flow velocities for Schizothorax prenanti juveniles was 0. 937 mg/h （0.10 m/s）〈1. 089 mg/h （0.00 m/s）〈1. 104 mg/h （0.30 m/ s）〈1. 760 mg/h （0.50 m/s）. The metabolic rate per unit weight （MR＇） of Schizothorax prenanti juveniles at different flow velocities also increased with the flow velocities. In addition, The metabolic rate per unit weight （MR＇） of Schizothorax prenanti juveniles clustered at 0.50 m/s was significantly higher than other groups,and no significant differences were found between other three groups.