Purple bacteria as sustainable nutraceutical ingredient in aquafeed: The case of guppies

IF 2.5 2区农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Animal Feed Science and Technology Pub Date : 2025-05-20 DOI:10.1016/j.anifeedsci.2025.116394

Sergio J. González Cámara , Sammy Kibor , Sara Olyslaegers , Abbas Alloul , Luis Diaz Allegue , Gudrun De Boeck , Siegfried E. Vlaeminck

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Abstract

Aquafeed is essential for aquaculture and the aquatic pet industry, but its production often comes with environmental challenges. This study explores purple non-sulfur bacteria (PNSB) as a sustainable, nutrient-rich and healthy alternative to fishmeal (FM) in guppy (Poecilia reticulata) diets. We tested two PNSB strains, Rhodobacter capsulatus and Cereibacter sphaeroides, at 2 % and 10 % inclusion levels, comparing their effects on fish growth, reproduction, coloration, and disease resistance against the bacterial pathogen Aeromonas hydrophila. Control diets included a standard FM diet and one supplemented with carotenoid-rich Chlorella pyrenoidosa. The results were promising: PNSB diets improved fish growth and reproductive output, with PNSB at 10 % achieving the highest offspring production. Brightness, a key trait for ornamental fish marketability, was significantly enhanced in PNSB-fed guppies, boosting their visual appeal. Most strikingly, guppies on purple bacteria diets showed up to 78 % survival following A. hydrophila infection in a challenge test, compared to just 33 % for those on the standard FM control diet. This study highlights PNSB as a game-changing ingredient for sustainable aquafeeds, improving fish health, survival, and market value while reducing reliance on traditional FM. These findings offer an eco-friendly solution for the growing aquaculture and ornamental fish industries.

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紫色细菌作为水产饲料中的可持续营养成分：以孔雀鱼为例

水产饲料对水产养殖业和水生宠物业至关重要，但其生产往往伴随着环境挑战。本研究探讨了紫色非硫细菌（PNSB）作为孔雀鱼（Poecilia reticulata）饲料中富含营养和健康的鱼粉（FM）替代品。我们测试了两种PNSB菌株，荚膜红杆菌和球形Cereibacter，在2 %和10 %的夹杂水平，比较它们对鱼的生长、繁殖、着色和对细菌病原体嗜水气单胞菌的抗病性的影响。对照饮食包括标准的FM饮食和添加富含类胡萝卜素的小球藻的饮食。结果是有希望的：PNSB饲料提高了鱼的生长和繁殖产量，10% %的PNSB饲料达到最高的后代产量。亮度是观赏鱼适销性的关键性状，在pnsb喂养的孔雀鱼中显著增强，增强了其视觉吸引力。最引人注目的是，紫色细菌饮食的孔雀鱼在嗜水杆菌感染后的挑战测试中显示出高达78 %的存活率，而标准FM控制饮食的孔雀鱼只有33 %。这项研究强调了PNSB作为可持续水产饲料的一种改变游戏规则的成分，可以改善鱼类的健康、生存和市场价值，同时减少对传统饲料的依赖。这些发现为不断增长的水产养殖业和观赏鱼产业提供了一个生态友好的解决方案。

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来源期刊

Animal Feed Science and Technology 农林科学-奶制品与动物科学

CiteScore

6.00

自引率

6.20%

发文量

266

审稿时长

3 months

期刊介绍： Animal Feed Science and Technology is a unique journal publishing scientific papers of international interest focusing on animal feeds and their feeding. Papers describing research on feed for ruminants and non-ruminants, including poultry, horses, companion animals and aquatic animals, are welcome. The journal covers the following areas: Nutritive value of feeds (e.g., assessment, improvement) Methods of conserving and processing feeds that affect their nutritional value Agronomic and climatic factors influencing the nutritive value of feeds Utilization of feeds and the improvement of such Metabolic, production, reproduction and health responses, as well as potential environmental impacts, of diet inputs and feed technologies (e.g., feeds, feed additives, feed components, mycotoxins) Mathematical models relating directly to animal-feed interactions Analytical and experimental methods for feed evaluation Environmental impacts of feed technologies in animal production.