Hmmm, that's really interesting information. I'd never have guessed. This actually has me worried actually.... :| you see, I created a 'snail and shrimp' tank awhile back and threw together most of my snails, including my tylomelanias, as well as all my shrimp. I've been concerned recently that it seems like the shrimp population has dropped and I'm wondering if the Tylomelanias could have something to do with this. Normally I'd reject any notion of snails being shrimpers, but maybe not....From my experience about 30 of these snails produce about 5 babies a month. I mean they are not very prolific snails.
But what is more interesting, I found it by accident, is that these snails love the smell of blood. They get very active when bloodworms are dropped in the tank. They also love to eat dead fish.
My point is - the way we feed the Tylomelanias probably affects their breedind. I didn't realize they loved meat before so I always fed them flake food and algae wafers. I never saw them getting as excited as when bloodworms or dead fish where present.