If you are going to smoke sea ducks you should soak them in milk overnight, wash them off, then brine them for another night. Your brine should be whatever you'd use to brine your pheasants. I use something like this:
4 cups water
3/4 cup pickling salt
1/4 cup brown sugar
2 crushed garlic cloves
sprig of fresh rosemary, whacked with the flat of a knife
a clove or two
Once brined overnight, take it out then let it dry on a rack. i use a fan to blow air over the breasts. This forms a pellicle, basically a coating to keep in moisture.
Then, smoke away! I like fruitwoods, but any hardwood would be good. Lemme know how it goes,
I love all of God's creatures, properly prepared.