"So the fish NOT endemic to regions of say, Honduras, would also be considered "feral"."
No, they would be depending on the curcumstances indigenous. The definitions are I think a little grey in areas and I think that way on purpose..........lol.
I agree it is a muddy affair. At it's base definition the original fish released and reverted to a wild existance would be feral. The preceding generations that have established a naturally sustainable breeding population could be considered wild there for technicly F0. That's why I said open to interpretation. Clear as mud?
"What about the wholesalers that are raising fish in ponds in CA/SA? Are they considered F0?"
I would consider these fish a domestic population do to the fact they are no more wild than domestic cattle raised on a ranch.