人工养殖中华鲟幼鱼摄食不同饵料的转化效率与生长特性

Feed conversion efficiency and growth characteristics of juvenile Chinese sturgeon(Acipenser sinensis)cultured with different diets

利用水蚯蚓与人工饲料分别投喂7月龄中华鲟（Acipenser sinensis）幼鱼,研究不同饵料对中华鲟幼鱼转化效率与生长特性的影响。结果表明：经过60d生长,水蚯蚓组、人工饲料组中华鲟幼鱼的平均体长分别从177.0、191.6mm增至216.6、332.5mm,体质量分别从32.73、44.39g增至58.27、264.71g;水蚯蚓组、人工饲料组中华鲟幼鱼的饵料转化率分别为6.67-39.33、0.89-1.26,特定生长率分别为0.19%-2.33%、1.38%-3.94%,生长效率分别为2.54%-14.99%、79.56%-204.44%;人工饲料组中华鲟幼鱼的生长速度快于水蚯蚓组,肥满度大于水蚯蚓组;2个试验组中华鲟幼鱼的体长与体质量均呈幂函数关系,各阶段幂指数b值均小于3,表明中华鲟幼鱼为异速生长;水蚯蚓组中华鲟幼鱼肌肉的水分湿质量含量为82.23%±0.79%,蛋白干质量含量为62.79%±1.34%,均略比人工饲料组高;综合饵料转化效率与各项生长指标,表明人工饲料比水蚯蚓更适宜作为中华鲟幼鱼阶段的人工养殖饵料。

Seven months old Chinese sturgeon（Acipenser sinensis）juveniles were fed with Limnodrilus sp.or artificial feed to study the feed conversion efficiency and growth characteristics of the juveniles.After 60-day growth trials,the body length of the juveniles fed with Limnodrilus sp.and artificial feed increased from 177.0 mm and 191.6 mm to 216.6 mm and 332.5 mm,and the body mass increased from 32.73 g and 44.39 g to 58.27 g and 264.71 g,respectively.The juveniles fed with Limnodrilus sp.and artificial feed had a feed conversion ratio 6.67-39.33 and 0.89-1.26,specific growth rate 0.19-2.33 and 1.38-3.94,and growth efficiency 2.54-14.99 and 79.56-204.44,respectively.There was an exponential relationship between the body length and body mass of the juveniles fed with Limnodrilus sp.or artificial feed,the exponential value being less than 3,which suggested the allometric growth of body length and body mass.The muscle＇s crude protein and moisture contents of the juveniles fed with Limnodrilus sp.were（62.79±1.34）% and（82.23±0.79）%,respectively,slightly higher than those of the juveniles fed with artificial diet.Based on the feed conversion efficiency and the growth indices,it was concluded that artificial feed was better than Limnodrilus sp.for the growth of juvenile Acipenser sinensis.