According to Absolute Bird Control, one of the best ways to deter ducks from using a dock is with bird decoys. There are several types of decoys, such as electronic decoys and wind-powered decoys, that can be used to keep ducks off of a dock.
Many decoys use movement to scare ducks. For example, spinning decoys spin in the wind and discourage ducks from getting too close to the area. Reflective tape is another type of decoy that is designed to scare birds. Electronic devices that use sound can also be used to scare and confuse ducks. Electronic devices also help deter other forms of wildlife from using the dock.