
08/13/2025
JELLYFISH: Living in Lake Erie! Large numbers of freshwater jellyfish have been documented in Lake Erie this summer now on multiple occasions. Strange but true, this may be mind blowing — But it’s actually not something new.
Approximately the size of a penny the freshwater jellyfish in Lake Erie are harmless to people. They are not an invasive species, but also not natural or native to Lake Erie. They’ve actually been documented to exist in Lake Erie since the 1930s and believed to initially have come from China. Still, they are considered a rare and stunning sight in the fresh waters of Lake Erie!
Researchers near Presque Isle Bay on Lake Erie first sighted the freshwater jellyfish in July. More recently larger numbers of freshwater jellyfish have been spotted near the Lake Erie Islands. OSU Stone Laboratory researchers have documented many on South Bass Island in Put-In-Bay in early August. According to Justin Chaffin, the Medusa (jellyfish form) is extremely seldom seen!