不同体长草鱼幼鱼鱼体化学组成的研究  

Chemical Composition in Juvenile Ctenopharyngodon idella at Different Body Length

作　　者：黄庆达[1] 张玉蓉[1] 王文[1] 王倩倩[1] 罗毅平[1] 

机构地区：[1]西南大学淡水鱼类资源与生殖发育教育部重点实验室,重庆400715

出　　处：《西南大学学报（自然科学版）》2013年第2期41-45,共5页Journal of Southwest University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(31000958);重庆市科委重点实验室专项经费资助项目

摘　　要：2011年11月于重庆市北碚区歇马镇采集草鱼幼鱼40尾,体质量范围16.2～277.7g,体长范围9.4～25.1cm,分为4个体长组,分别测定鱼体化学组成,估算其能量密度,用于探讨草鱼(Ctenopharyngodon idella)幼鱼鱼体化学组成随生长过程的变化规律.结果表明:草鱼幼鱼水分质量分数、蛋白质质量分数、脂肪质量分数和灰分质量分数占鱼体鲜质量的百分比范围分别为73.31%～77.21%,13.42%～16.81%,2.21～6.13%,3.27%～4.30%,能量密度范围为4.22～6.10kJ/g.蛋白质质量分数、脂肪质量分数和能量密度随体长增加呈增加趋势,而灰分质量分数变化无明显规律.统计分析表明体长与蛋白质质量分数、脂肪质量分数和能量密度呈显著的正线性关系,水分质量分数与蛋白质质量分数、脂肪质量分数和能量密度均呈显著的负线性关系.研究结果表明,采用草鱼幼鱼的体长和水分质量分数估算其蛋白质质量分数、脂肪质量分数和能量密度是可行的;草鱼幼鱼身体脂肪质量分数及其随生长增加的速率较低,可能与其草食性有关.Forty specimens of juvenile Ctenopharyngodon idella with a body weight （W） in the range of 16.2-277. 7 g and a body length （L） in the range of 9.4-25.1 cm were collected from Xiema town, Bei- bei, Chongqing in November, 2011 and divided into 4 groups based on their body length. The body chemi- cal composition of each group was measured and the energy density was estimated to investigate the varia- tion in these indicators with their increasing body size. The results showed that the contents, or mass frac- tions, of water （WAT）, protein （PRO）, lipid （FAT） and ash （ASH）, represented by the percentages of fresh body weight, were in the range of 73.31%-77.21%, 13. 42%-16.81%, 2.21--6.13% and 3.27%-4.30%, respectively. The energy density （E） ranged from 4.22 to 6.10 kJ/g. PRO, FAT and E in- creased with increasing L, while ASH varied erratically. PRO, FAT, and E were in a significant positive correlation with L, and the regression equations were PRO=0. 099 4L＋13.7 （r2 =0. 351, n=40, p〈0. 01）, FAT=0. 110L＋2. 21 （r^2 =0. 214, n=40, p〈0.01）, and E=0. 066 9L＋4.12 （r^2 =0. 376, n=40, p〈0.01）, respectively. In contrast, PRO, FAT and E were in a significant negative correlation with WAT, and the regression equations were PRO=-0. 366WAT＋43.1 （r^2 =0. 369, n=40, p〈0.01）, FAT=-0. 676WAT＋55.1 （r^2 =0. 628, n=40, p〈0.01）, and E=-0. 353WAT＋31.9 （r^2 =0. 816, n= 40, p〈0.01）. The above results suggest that the contents of protein, lipid and energy density of juvenile C. idella can be estimated by its L and WAT. The lower content and slow accumulation of lipid with in- creasing body size in this fish species may result from its herbivority.

关 键 词：草鱼 体长 化学组成 脂肪质量分数 能量密度 

分 类 号：Q955[生物学—动物学]