Source: Produced by cyanobacteria.

Summary: Cyanotoxins are produced by cyanobacteria in natural waters such as oceans, rivers, and lakes. Cyanobacteria are photosynthetic bacteria, often referred to as blue-green algae. There are multiple types of cyanobacteria. They form large blooms when phosphorus or nitrogen concentrations are high. Large algae blooms are detrimental to the biotic health of the water because the algae consumes large amounts of the dissolved oxygen needed for life. The cyanotoxins monitored by the EPA are microcystins, cylindrospermopsin, anatoxin-a group and saxitoxin. If ingested these cyanotoxins may cause acute health effects such as diarrhea, vomiting, or stomach pain.