Insect meal is gaining increased attention in aquafeed formulations due to high protein content and an essential amino acid profile similar to that of fishmeal. To investigate insect meal in feed for European perch Perca fluviatilis, a promising candidate for European intensive culture, we replaced standard fishmeal with partially defatted black soldier fly Hermetia illucens larva meal at rates of 0%, 20%, 40% and 60% (groups CON, H20, H40 and H60, respectively) and compared growth performance, somatic indices, hematological parameters, whole-body proximate composition and occurrence of spleen lipidosis. In addition, we assessed the economic and environmental sustainability of the tested feeds by calculating economic conversion ratio (ECR) and economic profit index (EPI). The tested groups did not differ in survival rate. Significant differences were documented in final body weight and specific growth rate, with the highest values in CON, H20 and H40. The proximate composition of fish whole-body at the end of the experiment did not differ in dry matter, crude protein or ether extract, while organic matter, ash and gross energy composition showed significant differences. The fatty acid content and n-3/n-6 ratio showed a decreasing trend with increasing H. illucens larva meal inclusion. No differences were found in hematological parameters among tested groups. The H. illucens larva meal inclusion significantly affected ECR and EPI, even at 20% inclusion level the cost of diets did not differ from the control fish meal based diet. Results suggested that 40% inclusion of H. illucens larva meal can be used successfully in standard diets for perch.

中文翻译：

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欧亚鲈（Perca fluviatilis）少年饮食中部分脱脂的Hermetia illucens幼虫餐

由于高蛋白含量和与鱼粉相似的必需氨基酸特征，在水产饲料配方中昆虫餐越来越受到关注。为了研究欧洲鲈鱼Perca fluviatilis（欧洲集约化养殖的有前途的候选人）饲料中的虫粉，我们用部分脱脂的黑士兵苍蝇Hermetia illucens代替了标准鱼粉以0％，20％，40％和60％的比率（分别为CON，H20，H40和H60组）的幼虫粕，比较其生长性能，体细胞指标，血液学参数，全身近端成分和脾脏脂质增生的发生率。此外，我们通过计算经济转化率（ECR）和经济利润指数（EPI）评估了受试饲料的经济和环境可持续性。测试组的生存率没有差异。最终体重和比生长率有明显差异，CON，H20和H40最高。在实验结束时，鱼全身的最接近组成在干物质，粗蛋白或乙醚提取物上没有差异，而有机物，灰分和总能量组成显示出显着差异。illucens幼虫膳食包含。在测试组之间血液学参数没有发现差异。H. illucens幼虫粗粉含量显着影响ECR和EPI，即使在20％的含量水平下，饲料成本也与基于对照鱼粉的饲料相同。结果表明，将40％的illucens幼虫粕包含在鲈鱼的标准饮食中可以成功使用。