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Freshwater pests
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Do you know your hornwort from your lagarosiphon?
As well as managing pest plants and animals across our region, ORC’s Biosecurity team work to prevent freshwater pests from entering and spreading throughout our waterways.
One of the ways the team do this is through an educational programme called Check, Clean, Dry.
Freshwater pests
Didymo
Management: Unwanted Organism | Didymo is a thick pinkish-brown layer that covers rocks and plants in freshwater, often forming flowing 'rat tails' with white-cream ends that look like soggy toilet paper, and feels like wet cotton wool.
Egeria
Management: Exclusion programme
Freshwater gold clam
Management: Unwanted Organism
Hornwort
Management: Exclusion programme
Lagarosiphon
Management: Site-led programme
Lake snow
Management: Organisms of Interest
Toxic algae
Toxic algae in rivers form brown or black mats, while in lakes they make the water look murky or like "pea soup" with green scums on the surface. Both are harmful to humans and animals
Check, Clean, Dry
CHECK your gear and remove pests. CLEAN your gear thoroughly. DRY it for 48 hours before moving to another waterway!
Report Pollution
Call the Pollution Hotline 0800 800 033 or fill in the form on this page
Marine pests
Marine pests are sneaking into Otago’s waters, posing a serious threat to our native species, marine industries, and treasured coastlines. Let’s work together to keep Otago’s waters safe and pest-free!
