Filamentous algae are a type of Green Algae that grow in long threads or filaments. When growth is excessive,
large mats can form that stretch from the river bottom to the surface and cover significant portions of a river
reach. For more information, click here.
Harmful Algal Blooms
Although many algae blooms are caused by Green Algae, there are some blooms caused by Cyanobacteria (Blue-Green
Algae). Some strains of certain species of cyanobacteria are capable of producing toxins. These toxins can
affect the liver, nervous system and/or the skin of people, pets, and wildlife. Algae blooms caused by species
capable of producing toxins are called Harmful Algal Blooms or HABs. For more information, click here.