MODELS FOR PREDICTING ENERGY DENSITY OF THE FISH BODY IN SILURUS MEIDIONALIS
南方鲇的鱼体能量密度及其预测模型

The energy density and fish body composition in Silurus meridionalis were measured for 4 samples. Of which two samples are 20 male and 20 female adults, respectively, collected in the Jialing River, from February, 1992 to April, 1993 The third sample contains 19 juveniles for which food was supplied at different ration levels for 20 days, and the last sample has 18 juveniles deprived food for different time, in the laboratory experiments from janurary to April 1996 The results show that there were significantly linear relationships in each sample between energy density and either dry mass or lipid content. This was also the care for the relationship between energy density and protein content in each of the 2 juvenile samples, but it was not for the adult samples. There was no significant relationship in any sample between energy density and ash content. By analysis of covariance (ANCOVA) on the regression equations of energy density to dry mass ( D M: % B. W.) in the 4 samples, an equation was developed for regressing the energy density ( E A:kJ/g) in both male and female samples: E A=-1 67+0 302 D M, and another equation for regressing the energy density ( E J: kJ/g) in both juvenile samples: E J=-2 26+0 319 D M.