饲料糖含量对南方鲇幼鱼日常代谢率的影响

笔者设计了系列试验，观测南方鲇在不同糖营养水平下生长、代谢、代谢酶活性等变化，旨在了解南方鲇的糖代谢状况及其在高糖营养条件下的适应性代谢对策，还探讨了糖和体重对日常代谢率的交互作用。

Effect of Carbohydrate Content in Feed on the Daily Metabolic Rateof.S.meridionalis

The routine metabolic rate in southern catfish juvenile(24.3-250.8 g)fed with saccharine feed(CHO)Was measured in this study.Fish were fed with iso-nitrogenous(40% crude protein)and iso-lipidic(10% crude lipid)experimental feed containing 0(control feed),15%,30% of carbohydrate level.The routine metabolic rates of 15% and 30% dietary carbohydrate group were significandy higher than that of 0% dietary carbohydrate group.The relationship betwenn body mass(Wt)and routine metabolic rate(Rr)of gouthem catfishfed with different test feed could be described as:(1)0% CHO:In(Rr)=0.986 ln(Wt) 1.419 r2=0.922,,n=25,P＜0.001;(2)15% CHO:ln(Rr)=0.912 ln(Wt) 1.74l r2=0.966,n=21.P＜0.001;(3)30% CHO:ln(Rr)=0.762 ln(Wt) 2.378 r2=0.958,n=21,P＜0.001. The intenrcept was increased and mass coefficient was decreased with the increase of carbohydrate level in feed. It could be concluded that southern Silurus meridionalis had poor metabolic capacity which led the increase of routine metabolic rate of fish with small size.But with the increase of body size southern Silurus meridionalis might had a better adaptation to high carbohydrate concentration.