This book presents a holistic overview of contemporary advancements in aquaculture nutrition, focusing on three transformative domains: the application of nanotechnology, the development of sustainable feed ingredients, and the implementation of precision feeding strategies. Nanotechnology is breaking new ground in aquaculture, offering innovative solutions for nutrient delivery, water quality monitoring, and disease control. By leveraging nanoscale technology, this field is enabling targeted and efficient nutrient uptake, potentially reducing feed costs and minimizing environmental impact.Sustainable feed innovation is a central theme, addressing the need to move away from over-reliance on traditional marine resources such as fishmeal and fish oil. Alternative protein and lipid sources—including insect-based proteins, algae, and plant-derived ingredients—are investigated for their potential to reduce the ecological footprint of aquafeeds while supporting optimal growth and health outcomes in farmed species. Additionally, functional additives derived from natural sources are discussed for their roles in enhancing immune function, growth rates, and resistance to disease, contributing to a more resilient aquaculture sector.