Last year our fish died. When I was going through the garage this weekend I found a half of a bag left of floating fish food pellets, and I wondered if I could feed them to my duck. The crude protein, fat, fiber, and phosphorus amounts are all very similar to the feed she is currently eating but it also has 500mg of Vitamin C which is not in her current feed. I know you shouldn't give citrus to chickens, but what about ducks?