An exception I have experienced not always, but more than once is where the Geese present were large resident Canadas. The ducks wanted nothing to do with the decoy spread at that location. It was not until the goose decoys were removed or moved farther down the shoreline that the ducks would commit. Another observation hunting water spreads for Geese every time I tried it, the Geese did not like spinning wing mojo decoys. Flapping wing decoys and flagging is the bomb though be it land or water. Geese are very vocal. Having a Canada call and knowing how and when to use it will make a huge difference in your success. More so than with hunting ducks IMO.