Scientific Name: Didymosphenia geminata
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. 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.
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