Bringing in ducks will work but controlling and not hunting them for 2-4 years is the hard part. If they establish and raise young you’ll be fine but it takes years. The one brought in may not migrate until wild ducks move them. Food and more food and habitats. Never over hunt a place. Resting areas for the birds full of food. Kill every coon and skunk and possum and coyote and fox. Mid to late spring floods kills the nesting sites.
