More Details: Blue-green Algae and Health

Surface water affected by blue-green algae often is strongly colored (blue-green, green, yellow, white, brown, purple, or red) and can have a paint-like appearance. Under some conditions, blue-green algae can become so abundant that they form floating mats or scums on the water. Blooms can also form on rocks, along the shoreline, and at the bottom of a waterbody. These are called benthic blooms.

Examples of blue-green algae blooms

View more examples of blue-green algae blooms.