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Dietary inclusion of a partially defatted black soldier fly (Hermetia illucens) larva meal in low fishmeal-based diets for rainbow trout (Oncorhynchus mykiss)
Journal of Animal Science and Biotechnology ( IF 7 ) Pub Date : 2021-04-16 , DOI: 10.1186/s40104-021-00575-1
Christian Caimi , Ilaria Biasato , Giulia Chemello , Sara Bellezza Oddon , Carola Lussiana , Vanda Maria Malfatto , Maria Teresa Capucchio , Elena Colombino , Achille Schiavone , Francesco Gai , Angela Trocino , Alberto Brugiapaglia , Manuela Renna , Laura Gasco

Recent investigations highlighted that Hermetia illucens (BSF) larva meal can be a valuable alternative protein source for aquafeed production. In this study, in substitution of fishmeal, we used increasing inclusion levels of a partially defatted BSF larva meal in low fishmeal-based diets for rainbow trout (Oncorhynchus mykiss Walbaum) and we evaluated the related implications in terms of growth performance, physical characteristics, proximate and fatty acid (FA) compositions of the fillets, gut and liver histology, and diet digestibility. In a 131-day trial, 576 fish (100.1 ± 9.29 g) were randomly allotted to 24 tanks (24 fish/tank, 4 replicates/treatment). Six experimental diets were produced to have partial replacement of fishmeal (0, 10%, 20%, 30%, 40% and 50%) by increasing levels of BSF meal (0% [BSF0], 3% [BSF3], 6% [BSF6], 9% [BSF9], 12% [BSF12] and 15% [BSF15] on as fed basis, respectively). No differences were observed among the treatments for all the considered growth performance parameters. The viscero and hepato-somatic indexes showed significant differences among the treatments, with the highest values observed in the BSF15 group. No differences were recorded in terms of fillet’s physical characteristics, dry matter (DM), crude protein (CP) and ether extract (EE) contents. Total saturated and monounsaturated FA increased, while polyunsaturated FA (particularly n-3 FA) decreased while increasing the HI meal inclusion in the diet. Histopathology of liver and gut was not affected, whereas, in posterior gut, villi were higher in BSF6 and BSF9 compared to BSF3 fish. The apparent digestibility of DM, CP, EE and gross energy did not vary among the treatments. These results suggest that a partially defatted BSF meal could be included up to 15% in low fishmeal-based diets for rainbow trout with no adverse effects on growth performance, fillet’s physical characteristics, gut and liver health, and diet digestibility. On the contrary, the fillet FA composition worsened while increasing the level of BSF meal in the diet.

中文翻译:

在低鱼粉饮食中为虹鳟鱼(Oncorhynchus mykiss)添加部分脱脂的黑战士苍蝇(Hermetia illucens)幼虫膳食

最近的调查强调,Hermetia illucens(BSF)幼虫粉可能是水产饲料生产中有价值的替代蛋白质来源。在这项研究中,我们用低鱼粉饮食中虹鳟鱼(Oncorhynchus mykiss Walbaum)的低脂膳食中部分脱脂的BSF幼虫粕的添加水平提高来代替鱼粉,并评估了其在生长性能,物理特性,鱼片的近似和脂肪酸(FA)成分,肠道和肝脏组织学以及饮食消化率。在一项为期131天的试验中,将576条鱼(100.1±9.29克)随机分配到24个水箱中(24条鱼/罐,4次重复/处理)。通过增加BSF膳食水平(0%[BSF0],3%[BSF3],6%),制作了六种实验性饮食,可以部分替代鱼粉(0%,10%,20%,30%,40%和50%) [BSF6],9%[BSF9],以饲喂量计分别为12%[BSF12]和15%[BSF15])。对于所有考虑的生长性能参数,各处理之间均未观察到差异。内脏和肝体指数在治疗之间显示出显着差异,在BSF15组中观察到最高值。在圆角的物理特性,干物质(DM),粗蛋白(CP)和醚提取物(EE)含量方面,未见差异。总饱和和单不饱和脂肪酸增加,而多不饱和脂肪酸(特别是n-3脂肪酸)减少,同时增加了膳食中的HI膳食含量。肝和肠的组织病理学未受影响,而在后肠中,与BSF3鱼相比,BSF6和BSF9中的绒毛更高。DM,CP,EE和总能量的表观消化率在各处理之间没有变化。这些结果表明,以低鱼粉为主的虹鳟鱼日粮中可以添加部分脱脂的BSF膳食,含量不超过15%,而对生长性能,鱼片的物理特性,肠道和肝脏健康以及饮食消化率没有不利影响。相反,在增加日粮中BSF粗粉含量的同时,圆角FA组成变差了。
更新日期:2021-04-16
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