Abstract
This study evaluated the production of two black soldier fly larval meals (BSFLMs) when rearing the larvae on brewers’ spent grains (BSFLM-B) or a commercially available substrate (BSFLM-C, Gainesville house fly diet). The resulting nutrient composition of the BSFLMs were significantly impacted by the feeding substrates, and they were evaluated as a protein ingredient for red drum, where BSFLM-B and BSLFM-C replaced 65% of the fishmeal protein from the control diet. For a comparative feeding trial, three experimental diets were formulated to be isonitrogenous and isoenergetic. Groups of 12 red drum (~ 5 g) were stocked in each of 15, 38-L aquaria, and the three experimental diets were distributed in a completely randomized block design. The experimental diets were offered for 8 weeks at fixed percentage of the body weight that was weekly adjusted. Red drum fed BSFLM-B diets presented impaired weight gain and feed efficiency when compared to the control group. However, red drum fed BSFLM-C diets had growth performance numerically lower, but it was not statistically different than that of fish fed the control diet. Dietary inclusion of BSFLMs significantly affected the whole-body saturated fatty acid composition, total omega-3 and omega-6, and reduced the mineral profile of red drum. The intestinal microbiota was also affected by the dietary BSFLMs, with possible reduction of the relative abundance of a prominent pathogenic bacterial Flavobacterium spp. The findings of the present study highlight the importance of the nutrition of BSFL prior ingredient manufacturing to be a suitable sustainable replacement of forage fishmeal for carnivorous fish, and the potential nutraceutical properties of BSLFMs to possibly combat enteric pathogenic in industrial conditions.
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