I too thought bass?
More to the point.........
Your feeders come from ponds that native species have access to!
The fish....MEH...disease carriers....
But where native fish enter water we also find birds.
These are IMO
some of the larger disease carriers that can effect or tanks.
More to the point again.......
This is not just feeders.
Many of your common tropicals come from these same farms.
This is why local breeders and knowing where your LFS
gets their stock from is important IMO