Freshwater jellyfish?

I have not had a chance to check this out yet, but I heard from some SJC students that freshwater jellyfish are back in Lake Banet. I recall that they were found there several years ago and there was an article about them somewhere.

Update: They have been found by a biology student who has been doing water sampling in the lake. They are not near the shore, but out in the middle, and apparently are quite common out there. The jellyfish stage is just one stage in their lives--most of the time they are tiny little things attached to vegetation. They seem to be evident every five to seven years but irregularly, and what triggers the jellyfish stage is not known. The student who found them hopes to get enough information to write and publish a paper.