Two experiments to determine the crude protein (CP) requirement of Heros severus were performed. Five isocaloric (3,200 kcal kg⁻¹ of digestible energy) diets containing five levels of CP (28, 32, 36, 40, and 44%) were evaluated. In the first, 75 fingerlings were distributed among 15 aquaria (30 L). In the second experiment, 100 juveniles were distributed among 20 aquaria (50 L). A quadratic effect on weight gain, specific growth rate for weight and for length, feed intake, feed conversion, body proteins, body lipids, and ash content of fingerlings occurred with increasing dietary CP, with optimum values estimated at 41.86, 40.30, 40.97, 39.60, 43.55, 40.64, 37.77, and 37.50% of CP, respectively. A linear effect on protein efficiency ratio of fingerlings occurred with increasing dietary CP. A quadratic effect on weight gain, specific growth rate for weight, feed conversion, hepatosomatic index, and body lipids of the juveniles were observed with increasing dietary CP, with optimum values estimated at 37.03, 37.20, 38.40, 35.13, 38.78, and 34,74% of CP, respectively. A linear effect on feed intake, protein efficiency ratio, and viscerosomatic index of juveniles occurred with increasing dietary CP. Blood glucose and hematocrit had lower values in juveniles fed a low level of CP.

中文翻译：

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西弗勒斯饮食中的蛋白质需求（Heckel，1840年）：一种亚马逊观赏鱼

进行了两个实验来确定西弗勒斯的粗蛋白（CP）需求。五等热量（3,200 kcal kg ^-1评估了含有五种CP水平（28％，32％，36％，40％和44％）的日粮。首先，在15个水族箱（30升）中分配了75种鱼种。在第二个实验中，在20个水族箱（50升）中分配了100只幼鱼。随着日粮CP的增加，对体重增加，体重和体长的特定生长率，采食量，饲料转化率，身体蛋白质，体脂和鱼种的灰分含量产生二次影响，最佳值估计为41.86、40.30、40.97，分别为CP的39.60％，43.55％，40.64％，37.77％和37.50％。膳食CP的增加对鱼种蛋白质效率的线性影响。随着日粮CP的增加，观察到对体重增加，体重的特定生长率，饲料转化率，肝体指数和幼体脂质的二次影响，最佳值分别为CP的37.03％，37.20、38.40、35.13、38.78和34.74％。随着日粮CP的增加，对摄食量，蛋白质效率比和内脏指数的线性影响发生。饲喂低水平CP的青少年的血糖和血细胞比容值较低。