高小强,田青杰,石洪玥,姜志强

• 1:大连海洋大学农业部北方海水增养殖重点实验室

摘要(Abstract)：

研究0、300、600、900、1 200、1 500 mg/kg 6个L-肉碱添加水平对牙鲆(Paralichthys olivaceus)幼鱼生长、生化组成和血液指标的影响。结果表明:添加量为1 200 mg/kg的处理组牙鲆幼鱼的增重率和特定生长率显著提高,饲料系数显著降低(P<0.05);随着饲料中L-肉碱含量的增加,肝指数呈现下降趋势,且在添加量为900~1 500 mg/kg时,各组较对照组差异显著(P<0.05);饲料中添加L-肉碱显著降低各实验组脏体比(P<0.05),而对各处理组间存活率和肥满度均无影响(P<0.05);肌肉和肝脏中的脂肪含量与L-肉碱添加量呈负相关,当添加量为1 200~1 500 mg/kg时,较对照组差异显著(P<0.05);肌肉中的蛋白含量与L-肉碱添加量呈正相关,但各组差异不显著(P<0.05);饲料中添加L-肉碱降低血清中的谷草转氨酶、胆固醇、甘油三酯和尿素氮含量,且添加量1 200 mg/kg组各指标含量均显著低于对照组(P<0.05);各处理组的血糖含量较对照组均有所增加,其中1 200 mg/kg组血糖含量较对照组提高41.6%(P<0.05);血清中总蛋白和低密度脂蛋白均随着L-肉碱添加量的增加而呈下降趋势,高密度脂蛋白却得以提升,但差异均不显著(P<0.05)。分析认为,在本实验条件下,饲料中添加L-肉碱可促进牙鲆幼鱼生长,且降脂效果显著。建议L-肉碱最适添加量为1 200 mg/kg。

关键词(KeyWords)： 牙鲆;饲料添加剂;L-肉碱;生长指标;生化组成;血液指标

Abstract:

Keywords:

基金项目(Foundation): 国家“十二五”科技支撑计划(2011BAD13B03)

作者(Author): 高小强,田青杰,石洪玥,姜志强

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