Thank you for your input. I was planning on separateing the babies from the parent snail and growing them on maybe I'll do that a few times befor I add them to my tank so I'm several generations on from the wind caught.In that scenario if the chain was broken then no the mother snail wouldn't pass the parasite to the babies. By broken I mean the fish and bird cycle. Other pathogens could be passed through the generations depending on the pathogens life cycle. If you qt the adult wild caught snail and then the babies from it sperating them after "birth" the chances of a fish affecting pathogen living through the generations is small, not impossible but small.