Full-fat meal, defatted meal, oil and chitin from black soldier fly in low and high soybean-based diets on growth performance and nutrient retention of rainbow trout
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Résumé
Insects, such as black soldier flies (BSF), have garnered attention in the aquaculture industry as a sustainable protein and lipid alternative to fishmeal and fish oil. However, research is lacking on which components of BSF improve fish growth and nutrition and whether or not it is necessary to remove oil and chitin from BSF. The aim of this study was to investigate the effects of feeding full-fat and defatted BSF larval meal as well as BSF components of oil and chitin, on growth performance and nutrient retention of juvenile rainbow trout ( Oncorhynchus mykiss ) challenged without and with a dietary stressor. Two 12-week feeding trials were performed where rainbow trout (mean initial weight of 29.63 ± 4.41 g in the first trial and 89.5 ± 1.6 g in the second trial) were fed with low (not challenged) or high (challenged) soybean-based diets, where fishmeal and fish oil were replaced with 5 and 10 % full-fat BSF, 5 and 10 % defatted BSF, 4 % BSF oil (extracted) and 1 % BSF chitin (extracted) at 8.6 °C. In fish fed low soybean-based diets, the inclusion of BSF oil and chitin led to improved growth performance (final weight, weight gain, FCR, and TGC) compared to diets containing 5 % or 10 % defatted BSF. However, the improvements were not significant when compared to the control diet. The improved growth was aligned with higher lipid intake, protein retained, and energy retained in fish fed the BSF oil and chitin diets. In contrast, for fish fed high soybean-based diets, the inclusion of BSF meals, oil, and chitin did not enhance growth performance or nutrient retention. Instead, fish fed the 5 % and 10 % defatted BSF diets showed similar reductions in weight gain and feed intake (protein, lipid, and energy). In summary, the full-fat and defatted BSF meals and BSF components from the two trials did not negatively reduce growth performance compared to the control diet, which highlights their successful replacement of fishmeal and fish oil. Additionally, these results demonstrate that feeding 4 % BSF oil and 1 % BSF chitin can improve growth performance and nutrient retention, although not when challenged with high soybean-based diets. These findings are important, as they show that BSF oil and chitin provide benefits to rainbow trout and should be included in BSF meals at low dietary inclusions (5–10 %) rather than removed during processing.
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Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découle