Green hair algae, a type of freshwater algae, is a filamentous growth that can form long, trailing strands in aquatic environments. It commonly infests ponds, lakes, and aquariums.
Green hair algae plays a vital role in the aquatic ecosystem by providing shelter and food for microorganisms. It also absorbs excess nutrients, improving water quality. Historically, green hair algae has been used as fertilizer and as a source of food for livestock.