Michigan: Didymo algal blooms found in the Boardman River

Second river in Michigan’s northern Lower Peninsula to experience nuisance didymo growth
The Michigan Department of Environment, Great Lakes, and Energy has confirmed the presence of didymo (Didymosphenia geminata), a nuisance alga also known as rock snot, in a stretch of the Boardman River in Blair Township in Grand Traverse County.
Blooms of didymo, a microscopic diatom (single-celled alga), were detected on the Upper Manistee River in Kalkaska County in December 2021 and have been found in the St. Marys River in the Upper Peninsula since 2015.
Not a typical alga
Unlike the harmful algal blooms that plague areas of the Great Lakes and some inland lakes due to warm temperatures and excess nutrients, didymo blooms form in cold, low-nutrient streams generally considered pristine – the same streams prized for their sport fisheries. Read more





