Key Laboratory of Freshwater Fish Reproduction and Development, Ministry of Education, Southwest University, Chongqing 400715, PR China.
Comp Biochem Physiol A Mol Integr Physiol. 2012 Apr;161(4):401-5. doi: 10.1016/j.cbpa.2011.12.015. Epub 2011 Dec 30.
The effect of meal size on the specific dynamic action (SDA) of the juvenile snakehead (Channa argus) was assessed at 25 °C. The fish were fed with test diets at meal sizes of 0.5, 1, 2, 3, 4, and 5% body mass and the postprandial oxygen consumption rate was determined at 1-h intervals until it returned to the pre-prandial level. The peak metabolic rate increased from 237.4 to 283.2 mg O(2) kg(-1) h(-1) as the relative meal size increased from 0.5% to 3% and leveled off at 4% and 5%. Factorial metabolic scope increased from 1.53 to 1.99 and SDA duration increased from 11.7 to 32.3h as the relative meal size increased from 0.5% to 5%. The relationship between SDA duration (D) and relative meal size (M) was described as: D=4.28 M+10.62 (r(2)=0.752, P<0.05, n=50). The energy expended on SDA increased while the SDA coefficient decreased with increasing meal size. The results of the present study suggest that the snakehead may adopt different feeding strategies when taking in different amounts of food.
在 25°C 下，评估了餐食大小对幼龄乌鳢（Channa argus）特殊动力作用（SDA）的影响。鱼以 0.5、1、2、3、4 和 5%的体重进行测试饮食喂养，在 1 小时的间隔内测定餐后耗氧量，直到恢复到餐前水平。随着相对餐食量从 0.5%增加到 3%，峰值代谢率从 237.4 增加到 283.2 mg O2 kg-1 h-1，然后在 4%和 5%时稳定下来。由于相对餐食量从 0.5%增加到 5%，实际代谢范围从 1.53 增加到 1.99，SDA 持续时间从 11.7 增加到 32.3h。SDA 持续时间（D）与相对餐食量（M）之间的关系可以描述为：D=4.28 M+10.62（r²=0.752，P<0.05，n=50）。随着餐食量的增加，用于 SDA 的能量增加，而 SDA 系数减少。本研究的结果表明，乌鳢在摄入不同量的食物时可能会采用不同的摄食策略。
