饲料中添加硫酸锌对奥尼罗非鱼幼鱼生长和机体抗氧化功能的影响  

Effects of different zinc levels on growth and antioxidation of juvenile hybrid tilapia (Oreochromis aureus ♂×Oreochromis niloticus ♀)

作　　者：吴红岩[1] 陈孝煊[1] 阳会军[2] 刘永坚[2] 田丽霞[2] 

机构地区：[1]华中农业大学水产学院,湖北武汉430070 [2]中山大学生命科学学院,广东广州510275

出　　处：《水产学报》2008年第4期621-627,共7页Journal of Fisheries of China

基　　金：国家"十一五"农业行业专项资助(nyzx07-044)

摘　　要：试验以硫酸锌为锌源,评价不同锌水平对奥尼罗非鱼幼鱼(Oreochromis aureus ♂×Oreochromis niloticus ♀)生长和抗氧化能力的影响。体质量为(4.13±0.32)g罗非鱼随机分配在18个水族箱中,每箱20尾,每3个箱为1个处理组,分别以添加锌为0、20、40、80、160和320mg·kg-1的6种饲料投喂,日投喂率为鱼体重5%～9%。8周的试验结果表明:20mg·kg-1锌饲料组的增重率和鱼体蛋白含量显著高于其它各组(P<0.05),蛋白质效率、饲料转化率也明显高于其它各组;全鱼脂肪含量随着饲料锌水平的升高而升高,但320mg·kg-1锌饲料组降低;20mg·kg-1锌饲料组,脊椎骨中锌离子浓度达到最大值且显著高于0mg·kg-1锌饲料组(P<0.05);20mg·kg-1与40mg·kg-1锌饲料组的血液中红细胞数量显著高于其它各添加组(P<0.05),20mg·kg-1锌饲料组的血液中血比容显著高于0mg·kg-1组(P<0.05),与其它各组没有显著差异;肌肉中,硫代巴比妥酸反应产物(TBARS)(Thiobarbituricaci d-reactivesubstances)的量,锌为0mg·kg-1饲料组显著高于其它各组(P<0.05)。综上所述,饲料中锌添加量为20mg·kg-1饲料促进了罗非鱼生长,使鱼体抗氧化功能增强。A 8-week growth trial was conducted to investigate the effect of different zinc levels on growth and antioxidant ability of juvenile tilapia. Tilapia[（4. 13±0.32） g] were randomly assigned to 18 tanks （20 fish per tank） and fed six experimental diets with different graded zinc supplemented levels （0,20,40,80,160,320 mg·kg^-1） for 8 weeks, zinc sulfate as sources. Each experimental diet was randomly given to three replicates and daily feeding rate was 5% -9% （wet weight basis）. Results showed that in the group fed with 20 mg·kg^-1 zinc, weight gain, protein efficiency and body protein content were higher than those in other groups. However, feed coefficient is reversed. The fat deposited in muscle and liver of 20 mg·kg^-1 zinc group had no significant difference with that in the group fed 320 mg zinc·kg^-1 level （P〉0.05） but was markedly lower than those in the other groups （P〈0.05）. The zinc concentration in bones of fish fed 20 mg zinc·kg^-1 was significantly higher than that in the group fed with 0 mg zinc·kg^-1 （P〈0.05）. The erythrocytes number and hematocrit of 20 mg·kg^-1 zinc group showed no significant difference with those in the group fed with 40 mg·kg^-1 zinc （P〉0.05）, but were significantly higher than those of other groups （P〈0.05）. The TBARS values （thiobarbituricacid-reactive substances ）in muscle of the group fed with 20 mg zinc·kg^-1 group were significantly lower than those in muscle of the group fed with 0 mg zinc·kg^-1 （P〈0.05）. Results of this study indicated that the effect of different zinc levels on growth and antioxidant ability was significant in tilapia, especially in 20 mg zinc·kg^-1 diet group.

关 键 词：奥尼罗非鱼幼鱼 锌 生长 抗氧化 

分 类 号：S963.73[农业科学—水产养殖]