Aquatic Nuisance Species (ANS)
What are
Aquatic Nuisance Species?
- Nonindigenous
- aquatic plants or animals
- that
- cause harm to native and desirable species
- or
- have a negative effect on aquatic habitats, the environment, or the economy of the state.
ANS News
Zebra Mussels Discovered in the Eastern End of Lake Sakakawea (10/27/2026)
Department has confirmed the presence of invasive zebra mussels on the extreme eastern portion of Lake Sakakawea.
Officials note that falling water temperatures this fall greatly reduce the immediate risk of zebra mussel spread. The Department will work with stakeholders over the winter to refine appropriate rules and implement best management practices to mitigate the spread of mussels before next year’s boating season.
Zebra Mussels Discovered in Horseshoe Lake (06/17/2026)
The Department has confirmed invasive zebra mussels in Horseshoe Lake, Richland County.
Horseshoe Lake is now considered a Class I ANS Infested waters. Emergency rules are in effect to prohibit the movement of water away from the lake, including water for transferring bait. Notices will be posted at lake access sites.
ANS Regulations and Reporting
Learn North Dakota's ANS
rules and regulations.
Discover what species are classified
as ANS in North Dakota.
Report ANS
sightings.
North Dakota High Risk Waters
The following aquatic nuisance species are known to be in at least one water body within North Dakota:
Protect North Dakota Waters from Aquatic Nuisance Species
Clean.
Remove all plants, animals and mud from all equipment.
Drain.
Empty water from baitwells, bilges, motors and other equipment.
Dry.
Dry equipment before using in a different water body.
Every Time.
