Cyanobacteria

Cyanobacteria are photosynthetic bacteria that produce blue-green surface blooms during warm, calm, nutrient-rich conditions. Some species produce cyanotoxins (microcystins, cylindrospermopsin, anatoxins) that are harmful to humans, pets, and livestock. Florida has documented annual cyanobacteria advisories on Lake Okeechobee, the St. Johns River, and many Central Florida lakes. Distinguishing cyanobacteria from filamentous algae visually is unreliable — the bloom looks like spilled paint or pea soup rather than stringy mats. Test with FDOH or a certified lab if pets or children have water contact.