不同规格圆口铜鱼幼鱼的化学组成和能量密度

摘要

To investigate the changes trend of chemical composition with the increasing body size in juvenile Coreius guichenoti ,23 specimens whose body length (L) and body weight (W) ranged 150~290 mm and 64 .1~422 .7 g respectively were collected from Jinsha River in November~December ,2014 .The fish were divided into 4 groups according to the body length .Their chemical compositions were measured and energy density was esti‐mated .The results showed that the contents of water (WAT ) ,protein (PRO) ,lipid (FAT ) and ash (ASH) of fish accounted for the wet weight 65 .87% ~69 .99% ,15 .65% ~18 .17% ,9 .95% ~14 .07% and 2 .69% ~3 . 80% ,respectively .The energy density (E) ranged 7 .23~10 .06 KJ/g .The statistical analysis displayed that PRO ,FAT ,ASH and E were in a significant negative linear correlation with WAT .In addition ,WAT was in a significant negative linear correlation with the body length .However ,PRO ,FAT ,ASH and E were in a signifi‐cant positive linear correlation with the body length .The results suggested that the chemical composition and the content of energy density of Coreius guichenoti can be estimated by the water content and the body length .The fish in a high lipid is supposed to be closely correlated with its long distance migratory breeding .%2014年11月－12月在金沙江收集体长（L）150～290mm，体重（W）64．1～422．7g的圆口铜鱼23尾，根据体长将其分为4组，分别测定其化学组成，估算其能量密度。结果显示：圆口铜鱼幼鱼含水量（WAT）、蛋白质含量（PRO）、脂肪含量（FAT）、灰分含量（ASH）和能量密度（E）占其湿重的百分比分别为65.87％～69．99％，15．65％～18．17％，9．95％～14．07％，2．69％～3．80％，7．23～10．06kJ／g。经统计分析，圆口铜鱼幼鱼含水量与其蛋白质含量、脂肪含量、灰分含量和能量密度均存在显著的负线性关系。另外，圆口铜鱼幼鱼体长与其含水量存在显著的负线性关系，而与蛋白质含量、脂肪含量、灰分含量和能量密度均存在显著的正线性关系。结果表明，可以用圆口铜鱼幼鱼的含水量和体长估测其化学组成和能量密度，圆口铜鱼高脂肪含量与其长距离繁殖洄游密切相关。