Aug 22, 2023 - News

You may be swimming with jellyfish in Michigan

Freshwater jellyfish. Photo: Courtesy of Greg Lashbrook, PolkaDotPerch.com, via Michigan Department of Natural Resources

Did you know that Michigan lakes and streams have jellyfish?

The intrigue: You may be thinking "wow, cute!" or possibly, "wow, no thank you!" But we're here to tell you that you're going to be fine.

  • These freshwater jellies are "common, though rarely seen" and aren't harmful to humans, per a state Department of Natural Resources press release.

Flashback: Freshwater jellyfish aren't native to North America but have been here for over 100 years and don't cause problems, the DNR says.

  • The first one observed in our state was in 1933, in southeast Michigan's Huron River.

Reality check: While these tiny creatures look and move like traditional jellyfish, they have a membrane that the marine ones lack. So they're "related," but not "true jellyfish," per the DNR.

  • The biggest they get is about the size of a quarter.
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