Ecology

Biology

Meal

Fish <Actinopterygii>

Animal science

Fishery

Blood meal

Botany

Food science

Rainbow trout

Larva

Hermetia illucens

Fish meal

Nutrient

Aquaculture

The effects of partially defatted black soldier fly larvae meal (BSFLM) and mechanically-extracted oil from that same insect (BSFLO) on growth, feed utilization, body composition, gut histology and blood plasma biochemistry of rainbow trout were evaluated over a three-month growth trial. Seven experimental diets containing 0 (Diet A), 6.6 (Diet B), 13.2 (Diet C) and 26.4% (Diet D) BSFLM, and 2.5 (Diet E), 5.0 (Diet F) and 10% (Diet G) BSFLO were randomly allocated to 21,140-l tanks at 30 trout (45.7 ± 1.4 g) per tank. To estimate the nutrient digestibility of these ingredients, Diet A was supplemented with 0.5% titanium dioxide and served as the Reference diet to create two test diets containing 80% of the Reference diet combined with 20% of defatted BSFLM (diet B-test) and 20% of BSFLO (C-test). Water temperature was maintained at 13.9 ± 0.3 °C in both trials. Growth performances, measured using the thermal-unit growth coefficient (TGC), were high with TGC values ≥ 0.260, regardless of BSFLM or BSFLO inclusion. Feed conversion ratios (FCR) were ≤ 0.91. However, TGC was significantly lower with Diet D (26.4% BSFLM) (P

The oil fraction and partially defatted meal of black soldier fly larvae (Hermetia illucens) affect differently growth performance, feed efficiency, nutrient deposition, blood glucose and lipid digestibility of rainbow trout (Oncorhynchus mykiss)