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Watershed Management Bureau
Exotic Species Program
Didymo (A.k.A. Rock Snot)
Click on each of the images above to view enlarged photo of didymo
| How to tell if you may be seeing Didymo |
| |
YES |
NO |
| Location |
mostly clear flowing water with rocky bottom, may be attached to plants |
deep silty areas with no rocks or plants, highly colored waters. |
| Color |
tan, light brown or whitish |
green or dark brown/black
clear or transparent |
| Texture |
clumps or ropy strands, rough cottony feel, fibrous |
thin layers, slippery or gelatinous |
| Appearance |
no leaves or roots (BUT may attach to leaves or stems). Sometimes mistaken
for fiberglass, toilet paper or tissue. |
has leaves or roots
looks like an aquatic plant |
If your sample matches three of the “yes” descriptions above, you may have found Didymo. We’d like to know!
Please send a dime-sized sample in small container or folded in a business card to:
Samples from Vermont
Didymo identification, Water Quality Division
103 S. Main St., Bldg 10N, First Floor
Waterbury VT 05671-0408
(802) 241 – 3770 or 241 – 3777
Samples from New Hampshire
NH DES Limnology Center
29 Hazen Drive
Concord, NH 03301
603-271-2248 or 603-271-3414
Be sure to include your name, address and phone or email so that we may contact you.
Also, please provide a detailed description of where you found your sample: name of the river or stream, the town, and precise location (such as GPS coordinates, nearest road, or a clearly marked map).
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