The specific dynamic action of southern catfish, <Emphasis Type="Italic">Silurus meridonalis</Emphasis> Chen,fed diets containing either raw or precooked corn starch or glucose |
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| Authors: | Shi-Jian Fu |
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| Institution: | (1) Laboratory of Evolutionary Physiology and Behaviour, College of Life Sciences, Chongqing Normal University, Chongqing, 400047, China |
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| Abstract: | The growth performance of carnivorous southern catfish (Silurus meridionalis) was lower when fed a diet containing glucose as a carbohydrate source than when fed one containing starch. To test whether
this decreased growth performance was partly due to higher metabolic costs induced by the fast assimilation of dietary glucose,
the postprandial metabolic responses of southern catfish juvenile (36.7 ± 1.9 g) fed diets containing either raw or pre-cooked
corn starch and glucose were investigated at 27.5°C. The peak metabolic rate of fish fed a raw corn starch diet was significantly
higher than that of fish fed precooked corn starch and glucose diets (P < 0.05). The specific dynamic action (SDA) coefficients (energy expended on SDA as a percentage of energy content of the
meal) of fish fed raw or precooked corn starch diets were significantly higher than that of fish fed a glucose diet (P < 0.05). The postprandial metabolic rate of fish fed a raw starch diet displayed a classic response – increased metabolic
rate immediately after feeding, followed by a decreased metabolic rate several hours after feeding – as has been documented
earlier in this species. However, the postprandial metabolic rate of fish fed a glucose diet had two alternating cycles of
increasing and decreasing metabolic rate, which has not been reported previously. This bimodal pattern of the SDA curve was
also found in a subsequent experiment in which purified d-glucose (0.1 g dry mass) was packed into sections of grass carp (Ctenopharyngodon idellus) intestine (0.05 g dry mass). The results suggest that the digestibility and absorption speed of the dietary carbohydrate
has a significant effect on postprandial metabolic response in juvenile southern catfish. The results of this study may provide
useful data in terms of the utilization of dietary carbohydrates by carnivorous fishes. |
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| Keywords: | Carbohydrate Corn starch Glucose Metabolic rate Nutritional homeostasis Specific dynamic action Silurus meridionalis Chen |
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