摄食水平对瓦氏黄颡鱼餐后代谢特征的影响  

Effect of Meal Size on Postprandial Metabolic Response in Pelteobagrus vachelli

作　　者：李秀明[1] 曹振东[1] 付世建[1] 

机构地区：[1]重庆师范大学进化生理与行为学实验室重庆市动物生物学重点实验室,重庆400047

出　　处：《动物学杂志》2009年第6期10-16,共7页Chinese Journal of Zoology

基　　金：国家自然科学基金项目(No.30700087);重庆市高校优秀人才支持计划项目;重庆市教委科研项目(No.KJ080823)

摘　　要：以新鲜泥鳅(Misgurus anguillicanndotus)肉块为饵料,采用麻醉灌喂的方法,在(25.0±0.5)℃条件下,研究了瓦氏黄颡鱼(Pelteobagrus vachelli)幼鱼[体重(7.03±0.15)g,n=42]不同摄食水平(饵料分别为体重的0%、1%、2%、4%和8%)对餐后代谢反应的影响。结果显示,在不同摄食水平下,瓦氏黄颡鱼摄食代谢均呈现先上升后下降的整体变化趋势;摄食水平由1%增加到8%,实验鱼的SDA耗能、SDA时间和摄食代谢峰值(PMR)分别从3.09kJ/kg、8h和56.08mgO2/kg.h增加到47.21kJ/kg、36h和97.25mgO2/kg.h;其中,8%(饱足摄食水平)和4%摄食水平组的代谢率在峰值水平能够持续20h左右。瓦氏黄颡鱼最大运动代谢率(MMR)为166.5mgO2/kg.h,显著大于饱食组PMR(P<0.05)。本研究还表明,随摄食水平上升,瓦氏黄颡鱼通过PMR的增加和SDA时间的延长来满足SDA耗能增加的需求;从摄食4%组和8%组相似的梯形摄食代谢曲线,可以看出瓦氏黄颡鱼在高摄食水平条件(>4%)下限制了摄食代谢的上升;PMR相对于静止代谢上升倍率较小,暗示其摄食占据的代谢空间较小,进而保留了大量剩余代谢空间用于运动和其他生理活动,这可能与其活跃的觅食活动习性有关。Effect of meal sizes （0%,1%,2%,4% and 8% body mass） on postprandial metabolic response was investigated in juvenile Darkbarbel Catfish （Pelteobagrus vachelli） （7.03±0.15 g,n=42） at 25±0.5℃.Fish were lightly anaesthetized and force-fed with freshly killed loach.The postprandial metabolic rate firstly increased and then slowly decreased to pre-fed level.The SDA duration were 8,24,26 and 36 h and time to peak metabolic rate （PMR） were 4,4,6 and 6 h in 1%,2%,4% and 8 % meal size groups.The peak metabolic rates of 8% meal size （97.25 mg O_2/kg·h） and 4% meal size （87.46 mg O_2/kg·h） groups were significantly higher than that of 2% meal size group （70.37 mg O_2/kg·h）,while the latter is significantly higher than that of 1% meal size group （56.08 mg O_2/kg·h） （P〈0.05）.The energy expended on SDA increased with meal size while the SDA coefficient of 1% meal size group was significantly lower than those of other meal size groups （P〈0.05）.The maximum exercise metabolic rate （MMR,166.5 mg 0.2/kg·h） was significantly higher than PMR （P〈0.05）.Both PMR and duration increased to fulfill the increased energy expenditure during SDA with the increasion of meal size.The similar trapeziform postprandial metabolic profiles of 4% and 8% meal size groups suggested that the increasion of PMR is restrained at high meal size range.The lower value of PMR/RMR implied that Darkbarbel Catfish has low feeding metabolic capacity.The withholding of large metabolic scope for locomotion and other physiological activities might be related to its active foraging mode.

关 键 词：特殊动力作用 摄食水平 代谢率 瓦氏黄颡鱼 

分 类 号：S917.4[农业科学—水产科学]