Minnesota Aquatic Invasive Species (AIS) Laws
Minnesota uses a tiered system to classify AIS and state laws to minimize introductions of AIS. This classification system establishes allowable uses for each species and the MN DNR was regulatory authority over AIS.

Prohibited Species
It is illegal to possess, import, purchase, or transport prohibited invasive species. The only exception is under a permit for disposal, research, or education. Species under the prohibited list that threaten the Arrowhead region include:

Curly Leaf Pondweed
Eurasian Watermilfoil




Rusty Crayfish with Zebra Mussels - WI DNR
Zebra mussels on a crayfish


Purple Loosestrife







Spiny Waterflea ( Bythotrephes longimanus )
Spiny waterflea



Regulated Species
You may possess, sell, buy, and transport regulated invasive species. However, it is illegal to introduce them to public waters. Regulated species threatening the Arrowhead include:

Banded mystery snail
Chinese mystery snail (Cipangopaludina chinensis) found at Manasquan ...
Chinese mystery snail
Rusty crayfish






Unregulated Nonnative Species
These are nonnative species that are not being regulated because they are not causing harm to the environment or economy. They include the rainbow trout, brown trout, house sparrow, pigeon and the common rat.