Frass is the by‐product of the larval meal industry and includes larval waste, exoskeleton sheds and residual feed ingredients. Experimental frass was derived from the larvae of black solder flies fed distillers' dried grains with solubles and had a protein and fat content of 216 and 60 g/kg, respectively. A 10‐week study was conducted to evaluate the effect of dietary levels of frass on growth, feed utilization, and body proximate and mineral composition of channel catfish, Ictalurus punctatus. Five diets containing 0, 50, 100, 200 and 300 g frass per kg diet were fed to channel catfish (5.24 ± 0.04 g) in quadruplicate aquaria to apparent satiation twice daily. Final weight gain was significantly increased in fish fed diets containing frass at levels from 100 to 300 g/kg. Fish fed diets without frass, and with 300 g/kg frass, showed the lowest and highest feed intake, respectively. Feed and protein efficiencies, however, were significantly lower in fish fed frass at levels of 200 g/kg and higher compared to the control diet. Survival, whole‐body composition and mineral content were not affected by frass. In summary, black soldier fly larval frass has potential as a protein source or just an ingredient for enhancing palatability of catfish diets.

中文翻译：

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黑水虻幼虫、Hermetia illucens、鲶鱼、Ictalurus punctatus、饮食的营养价值

Frass 是幼虫粉工业的副产品，包括幼虫排泄物、外骨骼棚和残留的饲料成分。实验果蝇来自用可溶物喂养干酒糟的黑海虻幼虫，蛋白质和脂肪含量分别为 216 和 60 g/kg。进行了一项为期 10 周的研究，以评估日粮水平对鲶鱼 Ictalurus punctatus 生长、饲料利用以及身体近端和矿物质组成的影响。每天两次将含有 0、50、100、200 和 300 g frass/kg 饲料的五种饲料喂给一式四份水族箱中的鲶鱼 (5.24 ± 0.04 g) 至明显饱食。在鱼饲料中添加 100 至 300 g/kg 的 frass，最终增重显着增加。饲喂不含鱼精和 300 g/kg 鱼精的饲料，分别显示最低和最高的采食量。然而，与对照饮食相比，以 200 g/kg 和更高的水平喂食 frass 的鱼的饲料和蛋白质效率显着降低。存活率、全身成分和矿物质含量不受 frass 的影响。总之，黑水虻幼虫有潜力作为蛋白质来源或只是提高鲶鱼饮食适口性的一种成分。