I have not seen any parasites in waterfowl but I have seen a lot of geese die this fall of steel poisoning. Something about BB's hitting them in the chest at 40 yards causes them to fall from the sky. :-D
:-D :-D
Seriously, Zanardi I have never heard of the parasites in ducks before. I have heard we have a lot of fish in OK caught with stuff similar in them but I have never seen it.
Just a thought, but you might shoot an email to your Wildlife Department and see what a waterfowl biologist says it is. If you do, let us know what they say.
Happy hunting.