This study tested whether sodium alginate, a natural substance from brown seaweed, could improve the health and growth of freshwater prawns used in farming. After 60 days of feeding trials, prawns given the highest dose of sodium alginate (4.0 grams per kilogram of feed) showed significantly better growth, improved immune function, and stronger antioxidant defenses compared to control groups. The supplement also promoted beneficial bacteria in the prawns’ digestive systems and improved their overall body composition.