THE EFFECT OF AEROBIC EXERCISE TRAINING AND FEEDING ON EXCESS POST-EXERCISE OXYGEN CONSUMPTION IN JUVENILE QINGBO (SPINIBARBUS SINENSIS)

To investigate the effects of aerobic exercise and feeding on excess post-exercise oxygen consumption (EPOC) in juvenile qingbo (Spinibarbus sinensis), 120 fish(21.35±0.05) g, (10.21±0.03) cm were exercised at 25℃ under four water velocities, i.e., nearly still water (control), 1 body length (BL)/s, 2 BL/s and 4 BL/s for eight weeks to measure the heart index, gill index and EPOC. The results showed that the heart and gill indexes significantly increased in 4 BL/s training group compared to those in other three groups (P < 0.05). Aerobic exercise resulted in a significant increase in the pre-exercise metabolic rate under both feeding and fasting status (P=0.001). There were no differences in the EPOC magnitude of S. sinensis between the exercise groups and control group under both feeding and fasting status. Peak post-exercise metabolic rate and increment of metabolic rate were significantly higher in the 4 BL/s trai-ning group than those of the control group under fasting status. Peak post-exercise metabolic rates and increment of metabolic rates were significantly higher in the three exercise groups than those of the control group under feeding status (P < 0.005). Feeding resulted in a significantly higher pre-exercise metabolic rate compared to fasting fish under the same water velocity (P < 0.001). Peak post-exercise metabolic rate is similar between the feeding and fasting treatment groups with the same water velocity. Feeding led to a significant decrease in the increment of metabolic rate and EPOC magnitude in the control group (P < 0.05). Our results suggest that aerobic exercise significantly increased ae-robic capacity, which may be related to the improvement of respiratory and circulatory system function, and that exhaustive exercise can induce maximum oxygen consumption rate, and that feeding reduced the anaerobic capacity in juvenile S. sinensis.