The short answer to this is no.
Ducks naturally eat a nutrient-rich diet that may consist of insect larvae and other aquatic invertebrates, small fishes, amphibians, as well as seeds and aquatic plants. Bread and similar products such as chips, donuts, popcorn and crackers provide very little nutritional value.
Ducks that are regularly fed bread can become malnourished, aggressive towards one another, may lose their foraging instincts and can lose their natural fear of people.
Also, bread that isn’t eaten can result in nutrient build-up and increased algae growth.
Feeding wild ducks is a practice CWF does not encourage. They may look cute, and a bit of bread might get them flocking towards you, but feeding them is doing more harm than good.