Marine biota includes marine microbes, plants, and animals that constitute about 50% of the total world biodiversity, and they have the potential of being a rich source of bioactive compounds that can be beneficial in the prevention of cancer, heart disease, and other diseases. However, the use of marine biota is largely unexplored, especially in the development of new drugs. This new book presents a comprehensive take on the topic of medically important marine microbiota, exploring medicinal compounds of marine microalgae, bacteria, and fungi associated with marine plants and animals. This first-of-its-kind book covers each type of medicinal microbiota in depth. It begins with an introduction to marine microbiota, followed by details on the toxins of marine microalgae and their potential therapeutic applications. It then covers medicinal marine microalgae and their compounds and bioactivities. Discusses medically important marine microbiota, exploring medicinal compounds of marine microalgae, bacteria, and fungi associated with marine plants and animals. Combines fields of marine biopharmacy, marine microbiology, and marine biology. Introduces marine microbiota, and their potential therapeutic applications.