I can look more into it, but I found this,
http://www.duckdvm.com/condition/blue-green-algae-poisoning#:~:text=Blue%2Dgreen%20algae%20toxicity%20is,harmful%20algal%20blooms%20(HABs).&text=Bloom%20events%20have%20both%20direct,cyanotoxin%2Dcontaminated%20food%20or%20water.
Toxicity In Ducks
(In the case of toxin exposure ALWAYS consult an avian veterinarian if possible.) They will be able to perform many diagnostic test, perform surgery if needed, provide advanced supportive care, and administer antibiotics initially and after to reduce seizures if the bird is...