Years ago, while doing a checkout dive in WI, I came across what I thought were jellyfish. This immediately made me think I was 'having problems'. I surfaced and asked the instructor who told me of freshwater jelly fish and that I was lucky to see them. Guess they are still around.
http://www.duluthnewstribune.com/event/ ... /id/177547
Freshwater Jellyfish
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