What's Your Nature?

Become a Nature Up North explorer to share your encounters with wild things and wild places in New York's North Country. Post your wildlife sightings, landscape shots, photos from your outings, and even your organization's events!

Adirondack Freshwater Jellyfish

Posted by Justin Dalaba,
North Country explorer from
September 24, 2016

Paddling along the Raquette River from Long Lake, one wouldn't expect to find a marine species drifting down the current in freshwater! I was surprised to discover these freshwater jellyfish (about the size of a dime) floating along the surface of the river by the dozens on Saturday. Was able to find some more info about them here: https://adkwatershed.wordpress.com/2014/12/03/freshwater-jellyfish-cres…


Erika Barthelmess

Wow Justin - this is really cool! Are they native?


Justin Dalaba

Hey Erika, according to the link I shared, they are definitely non-native but they don't seem to be considered an invasive yet. I hadn't heard of their existence in the Adirondacks but talking with some fish biologists, I heard they have been seen in large numbers in the Great Lakes. Must have been transported to the inland headwaters by boat somehow.