Evaluation of the suitability of a partially defatted black soldier fly (Hermetia illucens L.) larvae meal as ingredient for rainbow trout (Oncorhynchus mykiss Walbaum) diets

Abstract

BackgroundTwo trials were performed to evaluate a partially defatted Hermetia illucens (HI) larvae meal as potential feed ingredient in rainbow trout (Oncorhynchus mykiss Walbaum) diets. In the first trial, 360 trout (178.9 ± 9.8 g of mean initial body weight) were randomly divided into three experimental groups (4 tanks/treatment, 30 fish/tank). The fish were fed for 78 days with isonitrogenous, isolipidic and isoenergetic diets containing increasing levels of HI, on as fed basis: 0% (HI0, control diet), 25% (HI25) and 50% (HI50) of fish meal substitution, corresponding to dietary inclusion levels of 0, 20% and 40%. In the second trial, 36 trout (4 tanks/treatment, 3 fish/tank) were used to evaluate the in vivo apparent digestibility coefficients (ADC) of the same diets used in the first trial.ResultsSurvival, growth performance, condition factor, somatic indexes, and dorsal fillet physical quality parameters were not affected by diet. The highest dietary inclusion of HI larvae meal increased dry matter and ether extract contents of trout dorsal fillet. The use of HI larvae meal induced a decrease of valuable polyunsaturated fatty acids (PUFA) even if differences were only reported at the highest level of HI inclusion. The insect meal worsened the lipids health indexes of the same muscle. Dietary inclusion of insect meal did not alter the villus height of the fish. No differences were found among treatments in relation to ADC of ether extract and gross energy, while ADC of dry matter and crude protein were higher in HI25 if compared to HI50.ConclusionsThe obtained results showed that a partially defatted HI larvae meal can be used as feed ingredient in trout diets up to 40% of inclusion level without impacting survival, growth performance, condition factor, somatic indexes, dorsal fillet physical quality parameters, and intestinal morphology of the fish. However, further investigations on specific feeding strategies and diet formulations are needed to limit the observed negative effects of the insect meal on the FA composition of dorsal muscle.

Effect of rearing substrate on growth performance, waste reduction efficiency and chemical composition of black soldier fly (Hermetia illucens) larvae

“…The low quantity of recovered PUFA n3 in the larvae could represent a problem if insect meals are intended to be used for animal feed. Indeed, research highlighted a decrease in nutritional product quality with the inclusion of insect meals in animal diets especially when full‐fat meals are used . Nevertheless, BSF larvae can be enriched in PUFA n3 through the substrate .…”

“…Indeed, research highlighted a decrease in nutritional product quality with the inclusion of insect meals in animal diets especially when full-fat meals are used. 5,6,46 Nevertheless, BSF larvae can be enriched in PUFA n3 through the substrate. 33,47 Authors 10,48 reported that C12:0 is a good inhibitor of bacterial strains and could be of great interest in the reduction of the use of antibiotics in animal feeding.…”

“…3 The use of insects in the bioconversion of WS constitutes a new approach and an interesting example of sustainable circular economy. This bioconversion can generate new elements such as proteins and lipids for animal feeds, [4][5][6][7] biodiesel, 8 high-value products such as chitin 9 or antimicrobial peptides. 10 Processed proteins from seven insect species have recently been approved for aquafeed by EC Regulation No.…”

Influence of dietary black soldier fly ( Hermetia illucens Linnaeus) pulp on growth performance, antioxidant capacity and intestinal health of juvenile mirror carp ( Cyprinus carpio var. specularis)

“…When dietary modifications occur, digestive capacity and morphological changes of the intestinal tract are usually investigated in fish (Elia et al, 2018). Some research indicated that the suitable inclusion levels of BSF larvae in the diet did not have negative effects on gut health and nutrient digestibility by fish (Belghit et al, 2018;Elia et al, 2018;Li et al, 2017Li et al, , 2019Renna et al, 2017). Oxidative stress can strongly regulate and control the pathological status of fish (Martínez-Álvarez, Morales, & Sanz, 2005).…”

Digestive Organs and Status of Escherichia coli in Quail Intestine Given Defatted Maggot (Hermetia illucens) Meal as a Substitute For Meat Bone Meal

“…Data yang ditampilkan pada Tabel 2 menunjukkan bahwa tepung defatted maggot (Hermetia illuccens) dapat digunakan sebagai bahan pakan sumber protein Tabel 1 Formula dan kandungan nutrien ransum perlakuan berdasarkan as fed (dry rendering dan wet rendering), dan solvent extraction(Ketaren 2008).Hasil analisis kandungan lemak setelah dilakukan defatting menggunakan pressing tanpa pelarut mampu menurunkan kandungan lemak kurang lebih sebesar 22% yang berkisar antara 39,9917,95%. MenurutFasakin et al (2003) danSchiavone et al (2017) proses defatting dapat menurunkan kandungan lemak sebesar 5% (dalam dry matter) bergantung pada prosedur ekstraksi lemak. Pada protein kasar terjadi peningkatan sebesar 5% setelah dilakukan proses defatting, yaitu berkisar antara 36,9442,46%.…”