Hydrodictyon is a type of filamentous algae that forms in clean, eutrophic water. This genus is also known as water net because it forms colonies that resemble netlike hollow sacks. These colonies can grow to be 4-6 centimeters wide and 1 meter long. The cells form large pentagonal or hexagonal mesh. Because hydrodictyon reproduces very rapidly by biflagellated zoospores, it can take over a pond very quickly. The large mats will cover the water’s surface and can block sunlight from penetrating the pond to reach other plants and organisms below the surface. The best method of treatment for this algae is hydrothol or copper sulfate.
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