New Zealand mud snail (Potamopyrgus antipodarum) is an invasive species that has been found in northern and western Michigan. This species is prohibited in Michigan. On average, the snails are only 1/8 inch and the shells can be any shade between light brown and black. This species is highly adaptable and can be found in rivers, lakes, and streams. Contaminated boats, trailers, and fishing gear is the main way of spreading this snail species.
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Environmental Impacts
New Zealand mud snails reproduce by cloning. This means no fertilization is required before a female reproduces. A single female can lay 40 million eggs within a single year. Due to high reproductive rates this species outcompetes native invertebrates for food sources. They also have the ability to survive out of water multiple days which allows them to travel between bodies of water on contaminated watercraft/gear.
Treatment
There is no small-scale homeowner treatment option for New Zealand mud snail at this time. A large-scale treatment option is draining the body of water and allowing the snails to dry out, but this can affect all aquatic life present in the body of water. Prevention is key for controlling this species. It is important to inspect boats, trailers, and fishing gear. As always practice cleaning, draining, and drying your boat before transporting it.