The present research evaluates the performance of the Nile tilapia (Oreochromis niloticus) (initial weight 11.5 ± 0.07 g) with biofloc technology. For this purpose, spent grains (malted barley) from the brewing industry after aerobic fermentation were used, as both a carbon source (suspended solids) and partial substitute for the diets at 0, 10, 20, 30, and 40% levels (settleable solids). The partial 20% substitution of the diet did not have significant effects on the biological parameters: final body weight, weight gained, average body weight, specific growth rate, daily growth index, condition factor, feed conversion ratio, protein efficiency rate, and viscerosomatic and hepatosomatic indices. However, the dietary substitution showed a significant effect on the final biofloc chemical composition. Nitrogen compounds, NH4+, NO2−, and NO3−, were adequate for tilapia cultivation in all the treatments. No clear effect of partial dietary substitution was observed on meat quality parameters: pH, color, water holding capacity, and amino acid and fatty acid profile of fillet. The results suggest that a 20% substitution of the diet for malted barley is suitable for satisfactory biological parameters and Nile tilapia fillet quality.

中文翻译：

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使用发酵大麦副产品作为饲养尼罗罗非鱼（Oreochromis niloticus）幼鱼的部分饲料替代品和碳源

本研究评估了尼罗罗非鱼的性能（尼罗罗非鱼）（初始重量 11.5 ± 0.07 克）采用生物絮凝技术。为此，使用有氧发酵后的啤酒厂酒糟（麦芽）作为碳源（悬浮固体）并以 0、10、20、30 和 40% 水平（可沉淀）部分替代日粮。固体）。部分20%日粮替代对生物学参数没有显着影响：最终体重、增重、平均体重、特定生长率、日生长指数、体况因子、饲料转化率、蛋白质效率和内脏体和肝体指标。然而，膳食替代对最终生物絮凝物的化学成分显示出显着影响。氮化合物，NH4+， 不2-， 和不3-，足以在所有处理中养殖罗非鱼。部分膳食替代对肉质参数没有明显影响：pH、颜色、持水能力以及鱼片的氨基酸和脂肪酸谱。结果表明，用 20% 的麦芽替代日粮可以获得令人满意的生物学参数和尼罗罗非鱼片质量。