Mystery snails are a different name for Trap Door snails from what I read. Live bearing, plant eating doesn't matter, they are an intermediate host for parasites that spend part of their life cycle in fish. The only way to disrupt the life cycle is to remove one of the hosts. Take your pick from Fish, Snails or Waterfowl/Herons. What would be easiest to keep out of your pond? If you want to swim in your pond, the same hosts are in the Swimmers Itch life cycle.......

Bobby:

Yes, some of those parasites that you see are from snails, some are from bivalves. RES won't live in upper Wi. due to the cold winters. The only other fish that could control those parasites are Pumpkinseeds, which will survive colder water than RES.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).