Fishing


Freshwater Pests

Didymo

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.
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

Impact
  • Can spread by not drying and cleaning your gear
  • Environmental impacts (water quality – ecosystem health, biodiversity, loss of native species)
  • Ability to form large blooms in low-nutrient waters

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