Analysis of Gastric Evacuation Characteristics and Associated Mathematical Models in Juvenile Megalobrama pellegrini
QU Huantao1, LIAO Jianxin2, DAI Wei2, LIU Yong1, LU Xuebao1, YANG Yuanjin1
1. Hubei Key Laboratory of Three Gorges Projects for Conservation of Fishes, Institute of Chinese Sturgeon,China Three Gorges Corporation, Yichang 443100, China; 2. China Three Gorges ProjectsDevelopment Co., Ltd, Chengdu 610041, China
Abstract：Gastric evacuation rate was determined for juvenile Megalobrama pellegrini, an endangered endemic fish species mainly found in the upper Yangtze River basin in China, and 300 experimental fish with boby weight of (38.17±2.45) g were removed from various intervals (0, 2, 4, 6, 8, 12, 16, 20, and 24 h) after satiation feeding at (15.0±0.3) ℃. The wet mass of the chyme was determined, and three mathematical models were used to get the best fitting data of gastric evacuation in juvenile M. pellegrini. By further comparing the residual squares (RSS) and the residual standard deviation (SDR), the square root model was shown to be the best model for expression gastric evacuation rate in this fish. Its regression equations for the wet mass of the chyme was expressed as y0.5=0.951-0.036t (r2=0.899, P<0.001). According to the square root model, the gastric evacuation rate of juvenile M. pellegrini was 0.036 g/h, and 80% of the theoretical gastric emptying time was 14.83 h. Based on the above data, the optimal feeding interval could be 15 h for juvenile M. pellegrini at (15.0±0.3) ℃.
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2021, Vol. 40 
