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Didymo (Didymosphenia geminata)

A species of single-celled algae that grow in fresh water. It can form large mats on the bottom of lakes, rivers, and streams, affecting stream habitats and fish food sources, and making recreational activities unpleasant. Didymo is also sometimes called ‘rock-snot’. For more information go to www.biosecurity.govt.nz/didymo.