The invasive alga was found in the Takaka River last Friday.
The Department of Conservation says people flouting a swimming ban could introduce didymo into the clear water springs.
Source: Radio New Zealand
Salmon farm fears didymo spread to Waikoropupu Springs
NEW ZEALAND - A Golden Bay salmon farm says it is concerned that the invasive alga didymo could spread to Takaka's Waikoropupu Springs.