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Waternet algae (Hydrodictyon spp.) forms net-shaped colonies that resemble a fishnet or hairnet when the water is squeezed out. It is usually found in ponds with high alkalinity such as limestone quarry pits. They form thick floating mats on the surface of the pont that are light to medium green in color.
Mechanical Options
Waternet algae can be raked from the pond or strained out with nets or seines. Dyes or physical barriers which shade out the pond can be used with moderate success.
Information on Mechanical Treatment of Aquatic Vegetation
Biological Options
Grass Carp will consume Waternet Algae, but it is not a preferred food source. Please see the section on this website about Grass Carp and their use in controlling Aquatic Vegetation for more information.
Information on Biological Treatment of Aquatic Vegetation
Chemical Options
The active ingredients that have been successful in treating Waternet Algae include: copper based compounds (E), alkylamine salts of endothall (G), flumioxazin (G), and diquat (G). E = excellent, G = good
Information on Chemical Treatment of Aquatic Vegetation
Return to Filamentous Algae page