Mudsnails first discovered in US in 1987
Invasive New Zealand mudsnails have been detected in a Michigan creek, the sixth known infestation in Michigan in recent years.
The Michigan DNR said the mudsnails were found at the mouth of Shanty Creek, a tributary of the Grass River in Antrim County during routine monitoring in May and confirmed through DNA analysis in August.
New Zealand mudsnails were first discovered in the United States in Idaho’s Snake River in 1987. Since then, the snails have spread throughout the western states and into areas of the Great Lakes by attaching themselves to boats, waders and equipment.
The Grass River is now the sixth river system in Michigan known to be infested by the mudsnails. Their discovery in the Pere Marquette River in August 2015 signaled the first detection in a Michigan inland waterway. In 2016, populations were confirmed in the Boardman and Au Sable rivers. By 2017, the invasive snails were found in the Upper Manistee and Pine rivers.