Rapid development and drastic population increase in Qatar have led to increasing awareness about food security. Microalgae are considered one of the most promising feedstocks owing to their ability to produce nutrients, including lipids, carbohydrates, and proteins, in addition to antioxidants, vitamins, and minerals. In this study, 30 isolates of local freshwater microalgae were screened first based on their growth rate to select the most suitable strains for feed production. Based on the normality test, 15 fast-growing microalgae isolates were selected and subjected to further investigation of their metabolites content. The hierarchical Cluster Analysis conducted on lipids, proteins and carbohydrates contents subdivided these strains selected into 4 clusters, among them, the cluster one was grouping three Chlorella and two Mychonastes isolates with high nutritional values due to their high amounts of lipid and protein. The survey of metabolite production was performed every three days during growth in a volume of 3 L. We observed that the maximum amount of proteins and lipids was produced at day 6 and 14, respectively. The assessment of the Trolox equivalent antioxidant capacity of the top 5 strains proved that Mychonastes homosphaera isolate QUCCCM70 showed the highest antioxidant capacity. Moreover, results revealed the presence of essential amino acids and omega3 fatty acids. The screening evidenced a Mychonastes homosphaera strain QUCCCM70 with high nutritional value that can be considered as a promising alternative to produce a well-balanced animal feed supplement for a high quality of poultry and livestock products.

卡塔尔的快速发展和人口的急剧增加导致人们对粮食安全的认识提高。由于微藻除抗氧化剂，维生素和矿物质外还能够产生营养物质，包括脂质，碳水化合物和蛋白质，因此被认为是最有前途的原料之一。在这项研究中，首先根据生长速度筛选了30种本地淡水微藻菌株，以选择最适合饲料生产的菌株。根据正常性测试，选择了15种快速生长的微藻分离物，并对其代谢物含量进行了进一步研究。对脂质，蛋白质和碳水化合物含量进行的层次聚类分析将这些菌株分为4个聚类，其中一个聚类是将三个小球藻分组。以及两个因其脂质和蛋白质含量高而具有高营养价值的Mychonastes分离株。在生长过程中每三天进行一次代谢产物的调查，每3天进行一次，体积为3L。我们观察到最大量的蛋白质和脂质分别在第6天和第14天产生。对前5个菌株的Trolox等效抗氧化能力的评估证明，高分枝拟南芥分离株QUCCCM70显示出最高的抗氧化能力。此外，结果显示必需氨基酸和omega3脂肪酸的存在。筛查证明了Mychonastes homosphaera 具有高营养价值的QUCCCM70菌株，可以被视为生产高质量家禽和畜产品的均衡动物饲料补充剂的有前途的替代品。