First Southern Michigan Detection of Invasive Mudsnails

Invasive New Zealand mudsnails have been detected in Bear Creek, a Thornapple River tributary in Kent County, marking the first known infestation in Michigan’s southern Lower Peninsula and extending the species’ range about 75 miles south of its nearest established population. Volunteers found the snails during stream monitoring, and state officials and specialists confirmed the identification; Oakland University plans genetic testing to help trace the population’s origin. The snails reproduce without fertilization, with one capable of producing more than 200 offspring annually, and few natural predators curb their spread. Dense populations can displace native stream invertebrates that fish rely on, potentially harming trout and other sport fish. Officials urge people to clean, drain and dry boats and other gear after visiting waterways to reduce the risk of spreading the snails.