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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.
In November 2011, 40 young grass carp larvae were collected from Xiema town, Beibei District, Chongqing. The body weight ranged from 16.2 to 277.7g and the body length ranged from 9.4 to 25.1cm. The body length was divided into four body length groups, and the chemical composition of the fish body was determined. The energy density of Ctenopharyngodon idella was used to investigate the variation of chemical composition of juvenile Ctenopharyngodon idella with the growth process.The results showed that the moisture content, protein content, fat content and ash content of juvenile grass carp accounted for The mass percentages ranged from 73.31% to 77.21%, from 13.42% to 16.81%, from 2.21% to 6.13%, from 3.27% to 4.30%, and from 4.22 to 6.10 kJ / g in energy density.The protein content, fat mass fraction and energy density The results showed that there was no obvious regularity in the change of ash content with the increase of body length.The statistical analysis showed that there was a significant positive linear relationship between body length and protein mass fraction, fat mass fraction and energy density, and the water quality fraction and protein mass fraction, The scores and the energy density showed a significant negative linear relationship.The results showed that grass carp juvenile body length and water quality scores were used to estimate the protein content, Amount fraction and energy density are possible; low body fat mass fraction of juvenile carp and with increased growth rate may be related to its herbivorous.