An eight‐week feeding trial was conducted to evaluate the contribution of biofloc on dietary lipid requirement in whiteleg shrimp Litopenaeus vannamei. Five diets with graded levels of dietary lipid (45, 60, 90, 120 and 150 g/kg) were fed to juvenile shrimp. Final weight, weight gain and specific growth rate of shrimp fed diets with 60, 90 and 120 g/kg lipid levels were significantly higher than those of shrimp fed diets with lipid levels 45 and 150 g/kg (p < .05). Feed efficiency and protein efficiency ratio of shrimp fed 60, 90 and 120 g/kg were higher than those fed 150 g/kg diet. Plasma total cholesterol and triglyceride levels were lower in shrimp fed 45 g/kg compared with those fed the 90 g/kg (p < .05). Also, lysozyme activity for 90 g/kg group was higher than the 15 g/kg group. Hepatopancreas lipase and amylase activities of shrimp fed 90 and 120 g/kg diets were significantly higher than those of shrimp fed 45 and 150 g/kg diets. Broken‐line regression analysis for weight gain indicated that the dietary lipid requirement of whiteleg shrimp juveniles reared in a biofloc system was estimated to be higher than 56 g/kg but <60 g/kg.

中文翻译：

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生物絮团系统养殖南美白对虾幼虾的膳食脂质需求

进行了为期八周的饲养试验，以评估生物絮团对南美白对虾日粮脂质需求的贡献。将具有分级膳食脂质水平（45、60、90、120 和 150 g/kg）的五种饲料喂给幼虾。饲喂脂质水平为 60、90 和 120 g/kg 的虾的最终体重、增重和比生长率显着高于饲喂脂质水平为 45 和 150 g/kg 的虾（p < .05）。饲喂60、90和120 g/kg饲料的虾饲料效率和蛋白质效率比高于饲喂150 g/kg饲料的虾。与饲喂 90 g/kg 的虾相比，饲喂 45 g/kg 的虾的血浆总胆固醇和甘油三酯水平较低 (p < .05)。此外，90 g/kg 组的溶菌酶活性高于 15 g/kg 组。饲喂 90 和 120 g/kg 日粮的虾的肝胰腺脂肪酶和淀粉酶活性显着高于饲喂 45 和 150 g/kg 日粮的虾。体重增加的折线回归分析表明，在生物絮团系统中饲养的白脚虾幼虾的膳食脂质需求估计高于 56 g/kg 但<60 g/kg。