Aquaculture is a rapidly growing sector that plays a crucial role in global food security and animal protein production. However, feed accounts for the largest proportion of production costs, making efficient feed management essential for profitability and sustainability. Smart feed formulation involves developing nutritionally balanced and cost-effective diets that meet the specific requirements of cultured species while minimizing waste and environmental impacts. This article highlights the importance of understanding nutrient requirements, selecting appropriate feed ingredients, adopting least-cost formulation techniques, and improving feed conversion efficiency. It also discusses the use of alternative protein sources, feed additives, precision feeding technologies, and on-farm feed production as strategies to reduce feed costs and enhance productivity. Furthermore, emerging innovations such as insect based proteins, single-cell proteins, and AI-driven feeding systems are explored. Smart feed formulation is fundamental to achieving profitable, sustainable, and environmentally responsible aquaculture production.