Sustained exercise-trained juvenile black carp (Mylopharyngodon piceus ) at a moderate water velocity exhibit improved aerobic swimming performance and increased postprandial metabolic responses

Biology Open
Xiu-Ming LiShi-Jian Fu

Abstract

The objectives of this study were to examine whether sustained exercise training at four water velocities, i.e. nearly still water (control), 1 body length (BL) s-1, 2 BL s-1and 4 BL s-1, has effects on swimming performance and digestive metabolism in juvenile black carp (Mylopharyngodon piceus). The results demonstrated that fish subjected to sustained training at 2 and 4 BL s-1showed significantly higher critical swimming speed (Ucrit) and maximum metabolic rate (MMR) over the control group. Fish subjected to sustained training at 1 and 2 BL s-1showed a significantly (30 and 54%) prolonged duration, 14 and 17% higher postprandial ṀO2increment (i.e. ṀO2peak), and 62 and 92% more energy expended on specific dynamic action (SDA), respectively, after consuming a similar meal over fish kept in nearly still water. These results suggest that (1) sustained exercise training at a higher speed (2 or 4 BL s-1) had a positive influence on the aerobic swimming performance of juvenileM. piceus, which may be associated with improved aerobic metabolism; and (2) sustained exercise training at a lower speed (1 or 2 BL s-1) resulted in elevated postprandial metabolic responses in juvenileM. piceus.

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