Feasibility of superworm, Zophobas morio , meal as a partial fishmeal replacer in fingerling rainbow trout, Oncorhynchus mykiss , diet: growth performance, amino acid profile, proteolytic enzymes activity and pigmentation

Abstract

To characterize the effects of a defatted superworm meal (SWM) on the zootechnical performance and nutrient utilization of fingerling rainbow trout, we provided five practical diets with 0 (control), 10, 20, 30 and 40% SWM to substitute fishmeal. Fingerlings (N = 225; 9.9 ± 0.5 g) were randomly allocated over five treatments in triplicate. After eight weeks, the replacement of fishmeal with SWM up to 110 g/kg did not induce significant variations in the final weight and weight gain rate compared to the control group, while dietary 220 g/kg SWM had negative impacts on the growth and feed utilization attributes. The contents of protein and methionine were significantly reduced in the whole body with incremental dietary SWM. The pepsin and chymotrypsin activities were not influenced in the groups, but the lowest trypsin activity was seen in 40% replacement by SWM (p < .05). Total carotenoid content and redness of the fillet were improved with dietary SWM. No variation was seen in the digestibility of protein and dry matter in diets including 55 g/kg and 110 g/kg SWM compared to the control group (p > .05). Overall, optimum fishmeal replacement by SWM ranged from 162.6 to 184.2 g/kg in rainbow trout diet based on the broken‐line regression model.

Substituting Fish Meal with Tubiechong (Eupolyphaga sinensis) By-Product in the Diets of Largemouth Bass (Micropterus salmoides): Effects on Growth, Meat Quality, and Liver Health

“…Therefore, the crude lipid content increased progressively with the increase of the level of fish meal replaced by the Tubiechong by-product. Similar results were shown in previous studies [ 22 , 34 ]. The above results indicated that partial replacement of fish meal by the Tubiechong by-product positively affected the growth performance of largemouth bass to some extent.…”

“…Chemello et al also found that the growth and morphometric parameters of rainbow trout ( Oncorhynchus mykiss ) were not affected by defatted yellow mealworm ( Tenebrio molitor ) dietary inclusion [ 21 ]. Similarly, partially or entirely replacing fish meal with cricket ( Gryllus bimaculatus ) or superworm ( Zophobas morio ) did not lead to negative effects on the growth of olive flounder ( Paralichthys olivaceus ) or rainbow trout ( Oncorhynchus mykiss ), respectively [ 22 , 23 ]. In the study, when the substitution level reached 40%, the growth performance decreased slightly.…”

The synergistic effects of the probiotic ( Lactobacillus fermentum ) and cinnamon, Cinnamomum sp. powder on growth performance, intestinal microbiota, immunity, antioxidant defence and resistance to Yersinia ruckeri infection in the rainbow trout ( Oncorhynchus mykiss ) under high rearing density

“…At the end of the feeding period, the feeding was stopped for 24 h, the fish anaesthetised using clove powder (150 mg/L; Hosseini Shekarabi et al, 2021) and growth and nutritional indices were calculated using the following equations: …”

“…To evaluate serum immune parameters, three fish were anaesthetised from each tank using clove powder (150 mg/L; Hosseini Shekarabi et al, 2021). Blood samples were taken from the caudal peduncle using a 2 ml syringe.…”

Potassium diformate in the diet of sterlet sturgeon ( Acipenser ruthenus ): Zootechnical performance, humoral and skin mucosal immune responses, growth‐related gene expression and intestine morphology

“…All components were incorporated, and then, sunflower oil, Kilka fish oil and lecithin were added to the blend. Finally, lukewarm water was poured and mixed for 25 min to produce a stiff paste (Hosseini Shekarabi et al, 2021). The dough was pressure-pelleted by a meat grinder (Pars Khazar, Tehran, Iran) with a 1-mm stainless steel grinding disc.…”