The presentation covers algae blooms and their taxonomic diversity. It starts with the characteristics and locations of microalgae blooms, followed by a detailed definition of harmful algal blooms (HABs) and their impacts. The presentation highlights cyanobacteria blooms and explores the diversity of eukaryotic microalgae, focusing on diatoms, dinoflagellates, and cryptophytes, along with their predators. Other groups of microalgae contributing to bloom formation are also discussed, offering a comprehensive overview of the complexity and effects of algae blooms.