Abstract
A feeding trial was conducted to evaluate the effects of the dietary inclusion of black soldier fly (BSF),Hermetia illucens, prepupae in rainbow trout (Oncorhynchus mykiss) fingerling diets on growth performance, fillet quality, and gut and liver histology. Chicken waste meal and fruit & vegetable waste (1:9, v:v) were used as feeding substrates of BSF prepupae. Five diets were prepared: a basal diet (B0) based on fish meal (FM) and four additional diets in which BSF meal (BSFM) was used to replace 25, 50, 75, and 100% of the FM (B25, B50, B75, and B100, respectively). Orthogonal polynomial contrast was used to determine the trend between BSFM inclusion levels and growth parameters, fatty acids, and amino acids. Quadric relationships between the BSFM levels and growth parameters, including length and weight gain rate, specific growth rate (SGRW), and feed conversion rate, were determined. The optimum BSFM inclusion rate for the best SGRW was estimated at 11.9%. With the exception of the B100 group, increasing the BSFM level in the diet generally increases the fatty acid composition of whole fish. Dietary BSFM inclusion resulted in a significant increase in goblet cells in the proximal and distal intestines, as well as muscle layer thickness in the proximal intestine. A histological study showed that substituting fishmeal with BSFM had no effect on liver lipid accumulation. This study showed that replacing FM with BSFM in rainbow trout fingerling diets by 50% had no adverse effects on the growth performance, liver characteristics, feed utilisation, or fillet quality. Therefore, the BSFM described here can safely be used on rainbow trout fingerling diets. As a result, rainbow trout fingerlings can be fed 50% FM/BSFM replacement without adding additional essential amino acids to the diet or eliminating chitin from BSFM using the methods we used to culture BSF.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.