Feeding black soldier fly larvae (<i>Hermetia illucens</i>) reared on organic rest streams alters gut characteristics of Atlantic salmon (<i>Salmo salar</i>)

The Atlantic salmon (Salmo salar) aquaculture industry is growing, and with it, the need to source optimise sustainable ingredients for aquafeeds. Black soldier fly (BSF) larvae (Hermetia illucens) have received increasing research attention since they are a good of protein that can efficiently convert wide range low-value organic material into valuable resources. This study investigated impact three differently processed BSF meals, an untreated diet (BSFC+), dechitinated (BSFC-) fermented (BSFC+P+) at 10% inclusion level replacing fish meal in control (FM) marine soy concentrate based (SPC). Growth performance, gut microbiome histology fry was assessed. processing methods showed no adverse impacts on either growth performance or histology. However, significantly altered by both method larvae. Fish fed BSFC+, had increased diversity evenness community compared conventional sources alone, other methods. diets greater presence lactic acid bacteria genera associated faster growing hosts. high relative abundance genus, Exiguobacterium, chitin-degrading bacterium BSFC+P+ this completely dominated community, indicating dysbiosis. Future studies should determine, why Exiguobacterium has diet, if it provides digestive function host identify indicators optimal resilience. results confirmed promising replacement salmon, demonstrated BSFC+ potential prebiotic salmon.