Digestibility of defatted insect meals for rainbow trout aquafeeds

The apparent digestibility coefficients (ADCs) of the dry matter (DM), crude protein (CP), ether extract (EE), gross energy (GE), amino acids (AA), and main fatty (FA) four defatted insect meals in rainbow trout (Oncorhynchus mykiss) have been assessed. tested were obtained from two yellow mealworms (Tenebrio molitor – TM1 TM2), one black soldier fly (Hermetia illucens HI) lesser mealworm (Alphitobius diaperinus AD). experimental diets prepared by means substitution method, with each test ingredient included diet at 30% on an as fed basis using Celite ® inert marker. Eighty (140±5.6 g) stocked tanks connected to open water system. Faeces collected over consecutive weeks automatic collection device after feeding fish. ADCs DM, CP GE differed significantly, AD meal displaying lowest values. ADC EE different did not vary. As far AA is concerned, methionine changed according following pattern TM2=HI>TM1>AD, whereas cysteine tyrosine significantly lower than other meals. FAs (C12:0, C14:0, C16:0, C18:1 c9, C18:2 n-6 C18:3 n-3) higher 85% differ Overall, resulted be highly digestible differences among them depended both species specific production techniques These results provide useful data that may considered properly formulate compound for innovative sources.