This book delves into the current and emerging trends in the field of marine fish nutrition and health in tropical aquaculture systems in Sabah, Malaysia. The book chapters highlight the best practices in aquaculture from an experiential perspective and encompass sustainable feed production based on soldier flies as feedstock, copepods as live feed, incorporation of small molecules such as nucleotides as immune boosters, and the management of bacterial and fungal diseases in aquaculture. All of these elements constitute the foundation for the enhancement of productivity and efficiency of aquaculture systems within the context of sustainable ecosystems. The contents of this book will be of relevance to both academicians and practitioners of aquaculture and will offer valuable insights into the methodologies which can be applied to improve productivity and fish health in marine aquaculture systems.