期刊
FISHES
卷 6, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/fishes6030028
关键词
black soldier fly; digestive enzymes; fishmeal; growth performance; Hermetia illucens; insect meal; intestinal morphometry; nutrition; protein source; zebrafish
The study found that black soldier fly meal could be an effective alternative to fishmeal, with no adverse effects observed in zebrafish diets with replacement rates of up to 20%. Even when fully replacing fishmeal, normal growth and tissue structure in fish were maintained.
Fishmeal (FM) is still the most important protein source in aquafeeds. However, due to the reduction of wild fish stocks used for FM production, its manufacturing it is now unsustainable. Insect meal represents a valid alternative to FM, due to the low carbon footprint of its production and its high nutritional value. The aim of this study was to investigate the potentials of replacing FM with black soldier fly (Hermetia illucens) meal (HIM) in aquafeeds, using zebrafish as the animal model. Four diets were formulated with increasing HIM/FM replacement rate (the control diet contained 20% FM). Mortality rates, growth performances, and feed consumptions were measured, and fish intestine samples were collected for histological and enzymatic analysis. After 49 days, all groups almost tripled their initial body weight (cumulative body weight gain ranged between 143.9 and 155.2 mg), and no statistically significant differences among treatments were observed in relation to growth performances and histological traits. Contrarily, trypsin, alkaline phosphatases, and alpha amylase-glucoamylase activities were significantly reduced when the FM replacement rate was increased. In conclusion, HIM may represent an alternative to FM, since no adverse effects were observed when it was included up to 20% in the zebrafish diet, even when replacing 100% of the FM.
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