A feed composition of Perciformes fish comprises protein and dextran polysaccharide. Based on the total weight of the feed composition, the content of dextran polysaccharide is ranged from 0.05 to 0.5%. By adding dextran polysaccharide into the fish feed, immunity of aquatic animals can be enhanced, and survival rate of aquatic animals can be improved still more, thereby enhancing the yield of the overall aquatic animals.一種鱸形目魚類之飼料組成物,係包括:蛋白質;以及葡聚多醣,以該飼料組成物之總重計,該葡聚多醣之含量係介於0.05至0.5%,藉由魚飼料中添加該葡聚多醣,提升水產動物的免疫力,更能提升水產動物的存活率,因而能使整體水產動物之產率提升。
