A little, although not much. It's pretty early in the game, though. I think by the time it gets back to the 1st tank for the second time it'll be hard to even notice anything on the fish. Of course, you can't see inside the gills and such, and I hear they're the first thing the parasite go for.
Yeah, poor lil fella. Actually bothers me since i was taking care of him and he died.
Oh well...at least I gave it a shot.