饵料中添加自然产物对豹纹鳃棘鲈生长和体色的影响

Effects of natural additives on growth and bodycolor of leopard coral grouper(Plectropomus leopardus)

为探究自然成分添加剂对东星斑Plectropomus Leopardus的影响,选择了虾青素、叶黄素、螺旋藻和玉米蛋白粉4种自然产物,以不同量分别添加到石斑鱼配合饵料中制成实验饵料,在循环水养殖系统中喂养东星斑75d,测定了实验前后东星斑的生长率、特定生长率、饵料系数3个主要生长指标和鱼体代表部位的体色指标。结果显示,4种添加物对东星斑的增重率、特定生长率和饵料系数均无显著影响(P<0.05,下同);4种添加物均使东星斑的体色亮度L*值略变小,且部分体色L*值影响显著;4种添加物均能使东星斑的a*值和b*值升高,且与空白对照组比差异显著,尤其是虾青素,对东星斑体色整体变红、变黄效果最为显著。

In order to investigate the effects of natural additive on Plectropomus Leopardus,4 kinds of different contents of natural products（astaxanthin,xanthophyll,spirulina and corn gluten meal）were selected to formulate the baits to feed the leopard coral grouper（Plectropomus leopardus）in a recirculating aquaculture system for seventy-five days.The main growth index and the L＊value（Lightness）,a＊value（red—green）and b＊value（yellow—blue）of body color in these fish＇s eight parts（head cheek,opercula,dorsal,abdomen,dorsal fin,pectoral fin,tail fin and caudal peduncle）were measured by scale,straightedge and colorimeter before and after the experiment.The results show that compared with control group,these four additives have no significant impact on the weight gain rate,specific growth rate,feed coefficient of leopard coral grouper（P〈0.05）;all of these additives make the L＊value slightly smaller,and there are significance occurrings on some parts.Compared with the control group,all of the additives significantly lift the a＊value and b＊value of leopard coral grouper,among which the experimental feed with astaxanthin has the most significant effect.