Scientific Name: Didymosphenia geminata
Didymo is a type of alga (rock snot) found in over 150 South Island Rivers, but is not in the North Island.
Under the Biosecurity Act 1993, the entire South Island is a Controlled Area.
Didymo is a microscopic pest that can be spread by a single drop of water.
Attaches itself to stream, river and lake beds by stalks, forming a thick brown layer that smothers rocks, submerged plants and other materials.
Prevent the spread of pests with Check, Clean, Dry Methods
If you think you've found a freshwater pest - report online here
or call our pest and disease hotline 0800 80 99 66
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