Flavobacteria are a group of bacteria that belong to the phylum Bacteroidetes. They are primarily found in aquatic environments, including freshwater and marine ecosystems. These bacteria play a crucial role in the decomposition of organic matter, contributing to nutrient cycling in their habitats. Many species of Flavobacteria are known for their distinctive yellow pigmentation, which is due to the presence of carotenoid pigments. They can also be found in soil and are important for the breakdown of complex organic compounds. Some species are associated with fish and can be pathogenic, causing diseases in aquatic organisms.