The resting oxygen consumption ( V- O 2 rest ) , postprandial and post-exercise peak oxygen consumption ( V- O 2 peak ) of 137 juvenile southern catfish Silurus meridionalis, weighing 18·5 ± 0·8 g (mean ±s.d.), were measured at 25° C to determine whether V- O 2 rest is positively related to postprandial and post-exercise V- O 2 peak in sedentary S. meridionalis. In addition, postprandial metabolic response [i.e. the specific dynamic action (SDA)] after a satiating meal and the growth performance as a consequence of a 3 week feeding-growth trail were measured in 40 S. meridionalis, weighing 14·3 ± 0·2 g, at 25° C to determine whether postprandial V- O 2 peak is positively related to growth rate. Postprandial V- O 2 peak was positively correlated with V- O 2 rest , while post-exercise V- O 2 peak was not. Both postprandial V- O 2 peak and post-exercise V- O 2 peak were positively correlated with factorial and absolute scope. There was no significant correlation between the growth rate and postprandial V- O 2 peak in S. meridionalis. It suggested that as a sit-and-wait forager with low V- O 2 rest , low post-exercise V- O 2 peak and high postprandial V- O 2 peak , the expenditure of energy for maintenance in S. meridionalis may be more closely related to digestive processes than locomotor activities.
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