中文摘要：

为探讨三峡库区黑尾鲹（Hemicuher lcucisculus）鱼体化学组成随生长过程的变化规律，2007年10月于长江木洞江段采集黑尾鲹42尾，体长范围85～125mm，体重（形）范围5．63～12．89g，分为4个体长组，分别测定了鱼体化学组成，估算了其能量密度。结果表明，黑尾鲹含水量（WAT）、蛋白质含量（PRO）、脂肪含量（FAT）、灰分含量以其占鲜重的百分比表示，范围分别为70．24％～76．77％、14．6％～18．85％、1．92％～8．75％和3．60％-4．30％，能量密度（E）范围为4．55—7．45kJ／g；脂肪含量和能量密度随体重增加均呈增加的趋势，含水量呈下降趋势，而灰分含量变化不明显；体重与脂肪含量、能量密度呈显著的正线性关系，得到方程FAT=0．45W-1．34（r^2=0．58，n=21，P〈0．05）和E=0．21W＋2．97（r^2=0．67，n=21，P〈0．05）；含水量与脂肪含量、能量密度呈显著的负线性关系，得到方程FAT=73．00—0．92WAT（r^2=0．92，n=21，P〈0．05）和E=35．92—0．41WAT（r^2=0．95，n=21，P〈0．05）。结果提示可以用黑尾鲹的含水量及体重估计其含脂量和能量密度，该种鱼较低的脂肪含量及脂肪累积速率与其适应静水生活的习性有关。

英文摘要：

To discover the variation of body chemical composition with the increasing body size in Hemiculter lcucisculus, 42 specimens of this fish whose length and body weight（W） ranged 85 - 125 mm and 5.63 - 12.89 g respectively are collected from Yangtze River in October, 2007, and divided into 4 groups according to the body length. Chemical compositions are measured and energy density is estimated. The results show that the contents of water （WAT） , protein （PRO） , lipid （FAT） and ash（ represented by percentage of them in fresh body weight of fish, respectively） ranged 70.24% - 76.77% ,14.6% - 18.85% ,1.92% - 8.75% and 3.60% -4.30%, respectively. The energy density（E） rangs 4.55 -7.45 kJ/g. With the increasing body size FAT and E increase, while WAT decrease. The contents of ash vary erratically. FAT and E are all significantly correlated positively with W, and the regression equations are： FAT = 0.45 W- 1.34 （ r^2 = 0.58, n = 21, p 〈 0.05） , and E = 0.21W ＋ 2.97 （ r^2 = 0.67, n = 21, p 〈 0.05 ） respectively. The contents of lipid and energy density are all significantly correlated negatively with the contents of water, and the regression equations are ： FAT = 73.00 - 0.92WAT （ r^2 = 0.92, n = 21, p 〈 0.05 ）, and E = 35.92 - 0.41WAT （ r^2 = 0.95, n = 21, p 〈 0.05 ）. The results suggest that the contents of lipid and energy density of Hemiculter lcucisculus can be estimated by the contents of water or body size. The lower content and slow accumulation of lipid with the increasing body size in this fish may be resuhed from its acclimazation to the still water environment.