Effects of dietary mannan-oligosaccharide on growth performance of juvenile large yellow croaker(Pseudosciaena crocea)

采用单因素试验设计,进行为期30 d的饲养试验,探讨饲料中分别添加0%(对照组)、0.1%、0.2%和0.3%的甘露寡糖对初始平均体重为(7.26±0.08)g的大黄鱼幼鱼生产性能的影响。结果表明,饲料中添加甘露寡糖能有效促进大黄鱼幼鱼生长,提高幼鱼的抗病力。3个试验组的大黄鱼幼鱼增重率、均体长增长量显著高于对照组(P<0.05),幼鱼的成活率显著高于对照组(P<0.05),饲料系数则显著低于对照组(P<0.05)。综合评价大黄鱼幼鱼的成活率、增重率和饲料系数等参数,建议幼鱼饲料中甘露寡糖的最适添加量为0.2%。A 30-day feeding trial was conducted to investigate the effects of dietary mannan oligosac-charide(MOS) on growth performance of juvenile large yellow croaker(Pseudosciaena crocea) with ini-tially average weight(7.26±0.08) g.Basal diet were supplemented with 0%(control), 0.1%, 0.2%, and0.3% MOS in a totally randomized design trial in triplicate groups.The results showed that the dietarysupplemented with MOS could effectively promote the growth and improve disease resistance of juve-nile large yellow croaker(P.crocea).The growth rate,average body length growth rate and survival rateof juvenile large yellow croaker(P.crocea) in 3 experimental groups were significantly higher than thoseof control group(P<0.05).The feed coefficients in the all experimental groups were significantly lowerthan that of the control group(P<0.05).These results clearly indicated that dietary MOS could improvegrowth performance and increase the disease resistance in juvenile large yellow croaker(P.crocea), andthe 0.2% MOS supplementation was suitable for juvenile large yellow croaker(P.crocea).福建省区域重大项目“基于膨化软颗粒生产方法的功能性大黄鱼配合饲料的开发[2013N3001]”; 福建省厦门市科技创新项目“基于生物活性物质的鱼用保肝促生长制剂的研制与示范应用[3502Z20143002]