This book enlightens and provides in-depth knowledge about the emerging field of Probiotics especially in Aquaculture. The influence and growing demand in Probiotic feed in Aquaculture industry will be benefited with this compilation of vital concepts. In the field of aquaculture and fish farming, Probiotics plays a vital role in reaping the profit of controlling the sudden disease outbreaks. Aquaculture includes the farming of molluscs, algae, crustaceans, fish, and many other aquatic animals. This book talks more about the influence of Probiotics in the Aquaculture practices from the findings of tireless scientists. This book adds a drop in the ocean of resources available and contributes in the growth of Probiotics Aquaculture discipline. I thank all the scientist and authors mentioned and unmentioned, for their precious time and providing their expertise in the valuable contributions to this book.