Welcome to BYC, so sorry you for your loss.I was given Ivermectin to treat my flock of chickens wh also run with ducks. The vet told me to treat the ducks as well. I did, but ran out before treating the last ones. The vet had worked out the doses. All the ducks we treated became really ill & died a few days later. Those untreated were all fine. Autopsy results showed their livers were bright green & they had died from toxicity.
You have to be extremely careful what products you use on ducks.
