Planktonic algae appear as tiny particles that look like dust or grass clippings on the surface of the water and are mostly green, tan, reddish-purple, or blue. Benthic, or bottom dwelling, mats of ...

Blue-green algae can appear in two distinct ways. Planktonic blue-green algae look like tiny particles, dust or grass clippings floating in the water and are most often green, tan, reddish-purple ...

Blue-green algae has returned to Lough Neagh in high levels. Large green mats have formed around the lough, particularly in the north-east. The blooms previously closed bathing waters in ...