Abstract

The rapid expansion of global aquaculture necessitates sustainable, cost-effective, and functional feed ingredients that support both production efficiency and fish health. This study investigates Sargassum spp., a widely distributed brown seaweed, as a viable alternative feed resource through the sequential extraction of laminarin, fucoidan and alginate. Proximate analysis revealed high carbohydrate (36.8%) and mineral content (13.5%), moderate protein (14.7%), and low lipid (2.1%), confirming the nutritional potential of the biomass. Sequential extraction yielded a total of 21.6% polysaccharides. Functional characterization demonstrated that alginate exhibits superior water holding and oil absorption capacities, while fucoidan displays potent antioxidant activity, and laminarin provides moderate immune-supportive properties. These findings provide empirical evidence aligning with policy priorities on sustainable feed development, circular bioeconomy, and reduction of antibiotic use. Incorporation of Sargassum-derived polysaccharides into aqua-feeds supports local resource valorisation, enhances pellet stability, and improves fish health, thereby addressing FAO recommendations for marine biomass utilization. This study further underscores the importance of regulatory frameworks, standardized extraction protocols, and safety assessments for large-scale implementation. By bridging experimental outcomes with policy imperatives, this research offers actionable insights for stakeholders seeking resilient, environmentally sustainable, and health-promoting aquaculture systems.

Keywords

Policy, Sustainable Aqua-feed, Polysaccharides, Circular-Bioeconomy