Effect of feeding level and feeding frequency on specific dynamic action in Silurus meridionalis |
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Authors: | S J Fu† X J Xie‡ Z D Cao† |
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Institution: | Institute of Fisheries Sciences, Southwest China Normal University, Chongqing, 400715, China and; College Life Sciences, Chongqing Normal University, Chongqing, 400047, China |
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Abstract: | The effect of feeding level ( F L; 0·5 to 4% dry diet mass per wet fish body mass) and feeding frequency (once every 4 days to twice per day) on postprandial metabolic response was investigated in southern catfish Silurus meridionalis at 27·5° C. The results showed that there was no significant difference in the specific dynamic action (SDA) coefficient among the groups of different feeding levels ( P > 0·05). The duration increased from 26·0 to 40·0 h and the peak metabolic rate increased from 207·8 to 378·8 mg O2 kg?1 h?1 when the feeding level was increased from 0·5 to 4%. The relationship between the peak metabolic rate ( R P, mg O2 kg?1 h?1) and F L could be described as: R P = 175·4 + 47·3 F L( r 2 = 0·943, n = 40, P < 0·001). The relationship between the SDA duration ( D , h) and F L could be described as D =30·97 F L0·248 ( r 2=0·729, n =40, P < 0·001). |
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Keywords: | feeding frequency feeding level specific dynamic action |
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