Does dietary inclusion of defatted yellow mealworm (Tenebrio molitor) affect growth and body composition of juvenile common carp (Cyprinus carpio)?

Abstract

The objective of this study was to evaluate the effects of total and partial replacement of fishmeal with defatted yellow mealworm (Tenebrio molitor) meal on one-summer-old common carp (Cyprinus carpio) with an initial bodyweight of 97.54 g ± 51.0 g. Fish were kept in an experimental recirculating aquaculture system (9 x 250 L tanks) and fed with two experimental diets formulated with mealworm meal replacements and one control, which had 100 g/kg fishmeal without mealworm meal (MWM0). In the first treatment, 50% of fishmeal was replaced with mealworm meal (MWM50). In the second treatment, fishmeal was replaced totally with mealworm meal (MWM100). Fish were fed three times per day at 3.0% of fish biomass. After six weeks of the experimental period, growth performance, nutrient utilization, body composition, and biometric indices were compared. The results revealed that the growth performance of common carp was not affected significantly by the inclusion level of mealworm meal. However, the highest weight gain was observed in MWM100, where specific growth rate was 0.76 ± 0.10 g/day. Crude fat content of the fish body differed significantly between experimental groups and the control. This investigation demonstrated that MWM could be used as an alternative dietary protein source to replace fishmeal without adverse effects on the growth performance of one-summer-old common carp.

Chemical and Physical Properties of African Catfish (Clarias gariepinus) Fillet Following Prolonged Feeding with Insect Meal-Based Diets

“…There are similar findings where BS and MW-containing diets were applied at different inclusion levels with species like Jian carp ( Cyprinus Carpio var. Jian) [ 24 ], rainbow trout ( Oncorhynchus mykiss ) [ 25 ], common carp ( Cyprinus carpio ) [ 26 , 27 ], African catfish [ 28 , 29 ], and Siberian sturgeon ( Acipenser baerii ) [ 30 ]. However, in most cases, juvenile fish is the targeted age category for such nutritional trials.…”

Different Diets Based on Yellow Mealworm (Tenebrio molitor)—Part A: Facing the Decrease in Omega−3 Fatty Acids in Fillets of Rainbow Trout (Oncorhynchus mykiss)

“…The most probable cause for this is that the presence of insect fat interfered with the lipid deposition in muscle, as well as in liver (discussed further at a later point). The deposition of lipids in the muscle of insect-fed fish generates an intense controversy within the scientific literature, as there have been cases of increases [78][79][80], decreases [35,81,82], and no changes [42,83,84] for this variable. It is known that fish physiology counts with different metabolic "sparing effects", such as the omega−3 (n−3) sparing effect that happens when there are enough monounsaturated fatty acids (MUFA) and saturated fatty acids (SFA) in the diet [85].…”