军曹鱼幼鱼商品饲料中铁、锌适宜添加量的研究

Optimum Iron and Zinc Supplementation in Commercial Feed for Juvenile Cobia,Rachycentron canadum

在军曹鱼幼鱼商品饲料中添加铁100、200、300 mg/kg,添加锌30、1101、90 mg/kg,共投喂56d。试验结束时测定,军曹鱼成活率、质量增加率、红细胞含量、肌肉铁含量、骨骼铁、锌含量和肝脏铁、锌含量明显受饲料中铁、锌添加量的影响;血清碱性磷酸酶活性受铁、锌交互作用影响显著,饲料系数主要受铁锌交互作用的影响。以成活率和质量增加率为评价指标,军曹鱼幼鱼商品饲料中铁和锌适宜添加量分别为200 mg/kg和110 mg/kg。

A 2×3 factorial feeding trial including 3 levels of iron（100,200,and 300 mg/kg diet） and 3 levels of zinc（30,110,and 190 mg/kg diet） was conducted to determine the optimum dietary iron and zinc supplemental levels in juvenile cobia,Rachycentron Canadum.The fish（initial average weight 7.0 g） were stocked into 0.3 m3 plastic tanks at a rate of 13 individuals per tank and fed the diets for 56 days with triplication.There were significant differences in survival,weight gain,total red blood cell count,iron concentration in muscle,and zinc and iron levels in bone and liver in cobia fed the diets containing different iron and zinc levels（P0.05）.The activity of serum alkaline phosphatase（AKP） and feed conversion rate were significantly influenced by the interaction of iron and zinc（P0.05）.It is suggested from the survival and weight gain that the optimum supplemental levels in juvenile cobia commercial diet be 200 mg/kg diet for iron and 110 mg/kg diet for zinc.