Description
Appearance
Banded mystery snails are small animals with a coiled spiral shell. They grow up to one and a half inches tall and are light brown with red/brown horizontal bands that follow the spiral of the shell. The bands may be hidden by algae or sediment. The shell opening is on the right when the shell is pointed up. They have an operculum (”trapdoor”) covering the opening, which is missing when the snail is dead and the shell is empty.
Biology
The banded mystery snail grazes and filter-feeds on dead organic matter, typically on silt and mud substrates. They are called “mystery” snails because females give birth to young, fully developed snails that suddenly and “mysteriously” appear. Their lifespan is about four years. These snails can die off in large numbers and wash up on shore.
Origin and Spread
The banded mystery snail’s historic range is the southeastern United States, primarily in the Mississippi River system up to Illinois. The species is commonly imported and sold by the aquarium trade, leading to the potential for illegal release into the wild. Refer to EDDMapS for distribution information.
Don't be fooled by these look-alikes
Look-alikes:
- Chinese mystery snails (invasive)
- Faucet snails (invasive)
- New Zealand mudsnails (invasive)
- There are a number of snail species native to Minnesota. Contact the DNR for more information on native snails.
Regulatory Classification
The banded mystery snail (Vivaparus georgianus) is a regulated invasive species in Minnesota, which means it is legal to possess, sell, buy, and transport, but it may not be introduced into a free-living state, such as being released or planted in public waters.
Threat to Minnesota Waters
Invasive species cause recreational, economic and ecological damage–changing how residents and visitors use and enjoy Minnesota waters.
Banded mystery snail impacts:
- Cause mortality of largemouth bass embryos by invading bass nests.
- Can die-off in large numbers, fouling beaches and shoreland.
What you should do
People spread banded mystery snails primarily through movement of water-related equipment and illegal release of aquarium pets. It is illegal to release or dispose of unwanted aquatic plants or animals in or near public waters. Refer to Habitattitude for alternatives to release. Young banded mystery snails can be as small as a grain of rice. Adults and young, which may be hidden in mud and debris, can stick to anchors and ropes as well as scuba, fishing, and hunting gear. The snails’ operculum allows them to close their shells and survive out of water for multiple days.
Whether or not a lake is listed as infested, Minnesota law requires water recreationists to:
- Clean watercraft of all aquatic plants and prohibited invasive species.
- Drain all water by removing drain plugs and keeping them out during transport.
- Dispose of unwanted bait in the trash.
- Dry docks, lifts, swim rafts and other equipment for at least 21 days before placing equipment into another water body.
Report new occurrences of banded mystery snails to the DNR immediately by contacting your DNR Invasive Species Specialist or log in and submit a report through EDDMapS.
Control Methods
There is no known effective population control for banded mystery snails in natural water bodies at this time.