Effect of meal size on postprandial metabolic response in Chinese catfish (Silurus asotus Linnaeus)

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Abstract

The effect of relative meal size (0.5–24% body mass) on specific dynamic action (SDA) was assessed in Chinese catfish (Silurus asotus Linnaeus) (30.90±1.30 g) at 25.0°C; the cutlets of freshly killed loach without viscera, head and tail were used as a test meal. There was no significant difference in either SDA duration or peak oxygen consumption (VO2) among low meal size ranges. But both increased linearly as meal size increased from 2 to 24% without reaching a plateau. Factorial metabolic scope was 5.92 in fish fed with 24% body mass, the highest documented feeding metabolic scope value in fish till now. The Peak VO2 of satiated meal size groups (175.85±10.55 mg O2 h−1) was above 80% of maximum metabolic rate during locomotion recovery process (215.48±7.07 mg O2 h−1). The relationship between energy expended on SDA (E) and energy ingested (I) was described as: E=0.0000432I 2+0.140I+2.12. The lowest value of SDA coefficient appeared at 2% body mass group.

Keywords

Metabolic rate Meal size Peak VO2 Specific dynamic action Silurus asotus Linnaeus 
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Notes

Acknowledgments

This study was funded by the Science and Technology Committee and Education Committee of Chongqing, China. We declare that the experiments comply with the current laws of the country in which the experiments were performed.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Laboratory of Evolutionary Physiology and Behaviour, College of Life SciencesChongqing Normal UniversityChongqingChina

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