EFFECTS OF RATION LEVEL ON THE DAILY TOTAL METABOLISM, SPECIFIC DYNAMIC ACTION AND ACTIVITY METABOLISM OF THE ORIENTA SHEATFISH(SILURUS ASOTUS L.)

The daily total metabolic rates were determined for 31 fish with closed respirometers. In addition, resting daily total metabolic rates were determined for 20fish by confining the fish into a cage within the respirometer. The fish weighed 72.9-133.3g and were fed different ration levels from starvation to 4% bw/day at 25℃. The specific dynamic action and activity metabolism changed with ration level in the form of a "V" shaped curve, with the lowest values at ration levels of about 1% and 2% bw/day,respectively. The energy expenditure of specific dynamic action was 22.14% of food energy.