中文摘要：

为考察肉食性鱼类摄食后胃内含物的变化情况并探究肉食性鱼类消化生理特征，以鲇鱼幼鱼为对象，在（25．0±0．5）℃温度下采用实验鱼体重8％的泥鳅为饵料进行投喂，分别在摄食后0、1、3、6、12、18、24、36、48h测定胃内含物湿重、干重并计算占其摄食量的百分比，随后分别采用线性、指数、平方根3种数学模型对胃内含物百分比的变化进行拟合并比较上述不同方法的拟合程度。结果显示，摄入食物的湿重、干重均呈现随时间减少的趋势；3种模型均能较好地拟合鲇鱼幼鱼的胃内含物百分比的变化（P〈0．01）。研究认为3个模型中平方根模型对湿重和干重百分比变化的拟合最佳，分别为Y^0.5=10．11—0．26t（r^2=0．94，P〈0．01）和Y^0.5=10．27—0．24t（r^2=0．87，P〈0．01）。

英文摘要：

To investigate the character of the mass of the chyme in stomach and the gastric evacuation rate of carnivorous fish species, the dry and wet mass of chyme in stomach of Chinese catfish（Silurus asotus Linnaeus） is determined at （25 ±0.5） ℃ at 0, 1, 3, 6, 12, 18, 24, 36 and 48 h after feeding. Cutlets of freshly kill loach species （Misgurnus anguillicaudatus） without viscera. Head and tail are used as test diet, with meal size about 8% （body mass） in this study. The percent of the wet and dry mass （% the mass of invest food） are calculated, then the change of the percent of the wet and dry mass （% the mass of invested food） is simulated by three mathematical models in common uses for the gastric evacuation, including linear, exponential and square root model and the degree of simulation is compared. The results show that the wet and dry chymes both decrease after feeding. According to the statistical test, all of these three kinds of models fit the experimental data quite well, and the analysis shows that the square root model is the best, whether or not the remnant chyme in stomach is expressed by the percent of wet mass or dry mass. When the remnant chime in stomach is expressed by the percent of wet mass and dry mass, the square root models are y^0.5 = 10.11 -0.26t （r^2 = 0.94, p 〈0.01 ）and y^0.5 = 10.27 -0.24t （r^2 =0.87, p 〈0.01）.