The Difference Between Duckweed and Algae
Introduction
Both duckweed and algae can be found in nutrient rich and slow-moving or still water bodies. In many cases, algae and duckweed are found together in fast-forming and dense patches on the surface, making it hard to differentiate the two. In this blog post, we will help you identify duckweed and algae so that you can adapt your pond treatment strategies accordingly.
Difference Between Duckweed and Algae
| Duckweed | Algae | |
| Colour | Typically green but can sometimes appear reddish or brownish | Green, blue-green, brown, red, and even black |
|
Attachment |
Submerged floating (no roots hanging below the water surface) | Free-floating or attached to surfaces |
| Size and Shape |
Round or oval shaped, typically ranging from 1.5 to 3 mm in diameter. Usually one or more leaf attached to stem. |
Diverse shapes, such as long filaments, microscopic spheres, slimy mats, or branching structures. |
Separation Test
Place a stick in your water. Duckweed or blue-green algae will generally break apart when disturbed but algae generally stays together or may sink if disturbed. If it consists of tiny round leaves (1.5-3mm), you are likely dealing with duckweed.
Duckweed
Blue-green algae
Filamentous algae
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