Warwas Niklas, Berdan Emma L, Xie Xintian, Jönsson Elisabeth, Roques Jonathan A C, Doyle Darragh, Langeland Markus, Hinchcliffe James, Pavia Henrik, Sundell Kristina
Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden.
Swedish Mariculture Research Center, SWEMARC, University of Gothenburg, Gothenburg, Sweden.
Aquac Nutr. 2024 Oct 7;2024:4221883. doi: 10.1155/2024/4221883. eCollection 2024.
A nutritional bottleneck in salmonid aquaculture is the procurement of marine-derived compounds, such as essential amino and fatty acids, including omega-3 fatty acids, lysine, and methionine. Therefore, insects containing these compounds are highly promising as feed ingredients. The present study evaluates larvae of a "marine" insect (, the bristly-legged seaweed fly larvae, SWFL) reared on brown algae side streams as a feed ingredient for rainbow trout (). SWFL contained, on a dry matter basis, 60% crude protein (CP), 3.5% lysine, and 1.5% methionine, as well as 17% lipids, including 4% eicosapentaenoic acid and docosahexaenoic acid. Four isoenergetic (. 23 MJ kg gross energy) and isoproteic (. 45% CP) feeds were evaluated in a 10-week feeding trial. The diets included a control containing 25% fish meal, a commercial reference, and two diets substituting 40% fish meal with either SWFL or partially defatted black soldier fly larvae (BSFL) meal (). SWFL-fed fish displayed higher specific growth rates (SGR) compared to BSFL-fed fish and similar SGR compared to control and reference diet-fed fish. Feed intake in SWFL-fed fish was higher than for the control and BSFL diets and similar to the reference diet. The feed conversion ratio of fish fed the BSFL and SWFL diets was higher compared to the control, suggesting lower bioavailability of both insect meals compared to fish meals. No difference in intestinal health parameters was noted between the insect diets and the control diet, indicating good intestinal health across all treatments. However, changes in electrogenic intestinal transport were observed between the SWFL and BSFL diets, illustrating the heterogeneous effect of different insect products. Overall, SWFL meal is a promising alternative marine feed ingredient, compatible with circular production systems, as it can be efficiently cultivated using marine side streams.
鲑鱼养殖中的一个营养瓶颈是获取海洋来源的化合物，如必需氨基酸和脂肪酸，包括ω-3脂肪酸、赖氨酸和蛋氨酸。因此，含有这些化合物的昆虫作为饲料成分具有很高的潜力。本研究评估了以褐藻侧流饲养的一种“海洋”昆虫（刚毛腿海藻蝇幼虫，SWFL）的幼虫作为虹鳟鱼的饲料成分。以干物质计，SWFL含有60%的粗蛋白（CP）、3.5%的赖氨酸和1.5%的蛋氨酸，以及17%的脂质，包括4%的二十碳五烯酸和二十二碳六烯酸。在一项为期10周的饲养试验中评估了四种等能量（23 MJ kg总能）和等蛋白（45% CP）的饲料。日粮包括一种含有25%鱼粉的对照日粮、一种商业参考日粮，以及两种分别用SWFL或部分脱脂的黑水虻幼虫（BSFL）粉替代40%鱼粉的日粮。与喂食BSFL的鱼相比，喂食SWFL的鱼显示出更高的特定生长率（SGR），与喂食对照日粮和参考日粮的鱼相比，SGR相似。喂食SWFL的鱼的采食量高于对照日粮和BSFL日粮，与参考日粮相似。与对照相比，喂食BSFL和SWFL日粮的鱼的饲料转化率更高，这表明与鱼粉相比，两种昆虫粉的生物利用率较低。在昆虫日粮和对照日粮之间未观察到肠道健康参数的差异，表明所有处理的肠道健康状况良好。然而，在SWFL和BSFL日粮之间观察到了肠道电转运的变化，说明了不同昆虫产品的异质效应。总体而言，SWFL粉是一种有前景的替代海洋饲料成分，与循环生产系统兼容，因为它可以利用海洋侧流高效养殖。
