【作者】 刘艳莉； 胡毅； 田芊芊； 石勇； 钟蕾；

【Author】 LIU Yanli;Hu Yi;TIAN Qianqian;SHI Yong;ZHONG Lei;Hunan Engineering Technology Research Center of Featured Aquatic Resources Utilization, Hunan Agricultural University;Collaborative Innovation Center for Efficient and Health Production of Fisheries in Hunan Province;

【机构】 湖南农业大学湖南省特色水产资源利用工程技术研究中心； 水产高效健康生产湖南省协同创新中心；

【摘要】 为研究鱼粉水平和养殖密度对青鱼生长、免疫的影响,本试验采用鱼粉水平（10%、20%）×养殖密度（50、100、200尾/箱）的双因素设计,将青鱼分为L₅₀、L₁₀₀、L₂₀₀、H₅₀、H₁₀₀、H₂₀₀ 6组。结果显示:1)生长性能:养殖前期（第8周）,青鱼的增重率随密度的增加呈先上升后下降趋势;H200组的青鱼增重率高于L200组,但在养殖后期（第16周）显著低于L200组。2)免疫应激指标:养殖前期,低鱼粉组青鱼的LSZ、GIU随密度的升高先下降后上升,S-Ig A有提高的趋势;H₂₀₀组的LSZ、C4、IgM、S-Ig A和COR含量均高于L₂₀₀组,GIU低于L₂₀₀组。养殖后期,高低鱼粉组的C4随密度的增加呈下降后上升的趋势。H₂₀₀组的IgM和COR含量均高于L₂₀₀组,GIU低于L200组。综上所述,高密度养殖会使青鱼幼鱼生长性能降低,且对机体免疫、抗应激能力产生负面影响;养殖前期提高饲料鱼粉水平对高密度组生长有促进作用,且对青鱼免疫、抗应激能力有一定改善作用。更多还原

【Abstract】 The experiment used two-factor design of fishmeal level（10%, 20%） × culture density（50, 100, 200 tails/box） to study the effects on growth and immunity of black carp.The results showed that: 1) Growth : In the early stage（8 weeks）, the weight gain rate of black carp increased first and then decreased with the increase of density, the weight gain rate in H₂₀₀ was higher than L₂₀₀, and significantly lower than it in the late stage（16 weeks）. 2)Immune stress index: In the early stage, the LSZ,GIU of black carp in low fish meal decreased first and then increased with the increase of density, and LSZ,C4,IgM,S-IgA and COR in H₂₀₀ was higher than L₂₀₀,GIU was lower than it. In the later stage, the C4 of high and low fish meal decreased with the increase of density, IgM and COR in H₂₀₀ were higher than L₂₀₀, and GIU were lower than it. In conclusion, high density can reduce the growth of black carp and have negative effect on immunity and anti-stress ability,raising fish meal can promote the growth of the high density group in the early, and it has improvement effect on immunity and anti-stress of black carp.更多还原