JLW
CCA Members
Don't discount the possibility of some parasites being spread by birds and what not, but, for the most part, that kind of stuff needs an intermediate host of some sort (typically the bird). Unless you have a pet duck, its not likely to spread.That’s what I figured too since they’re not in contact with any natural bodies of water.
For me, I also feel like the sick fish would have been weaned out of the population outside quickly.