RE: How many decoys?
In our Early September season when we are bangin the locals 3-6 dozen fullboys. Once the regular season gets under way and we start getting the migrators 6-10 dozen fullbodys. Then when the birds start concentrating on the river at Pierre, around 500 some fullbodys and 6-8doz shells.
We do all our mallard shooting over fields, don't use any duck decoys, just throw out some Lucky Ducks early in the AM an pull 'em once the geese start flying.