南方鲇的日总代谢和特殊动力作用的能量消耗

THE DAILY TOTAL METABOLISM AND SPECIFIC DYNAMIC ACTION IN THE SOUTHERN CATFISH (SILURUS MERIDION ALIS)

  • 摘要: 采用封闭式呼吸仪,在15、20、25、30℃条件下测定了91尾南方鲇(Silurus meridionalis Chen)幼鱼(8.49-151.0g)的日总代谢率。日总代谢率与静止代谢率之比随温度的升高而降低,随日粮水平的增加而上升,变幅为1.076-3.066倍。代谢率与生长率之间存在的线性关系表明,每增长1g体重,生长过程的代谢耗能量增加2288.2J。温度和体重对特殊动力作用(SDA)无明显的影响,SDA的耗能量占摄入能量的百分比相对恒定,为20.18%。

     

    Abstract: The daily total metabolism of 91 juveniles weighing 8.49-151.0 g were measured with closed respirometers at 15, 20, 25, and 30℃. The fish were fed four ration levels from starvation to 4% B. W. /day. The ratio of total metabolism to resting metabolism increased with increasing ration level and decreasing temperature. The ratio ranged from 1.076 to 3.066. The metabolic cost per unit body weight gain, calculated from the linear relationship between metabolism and growth, was 2288.2 J/g. The specific dynamic action (SDA), expressed as a percentage of food energy, was independent of temperature and body weight, and was 20.18%.

     

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