I may have incorrectly assumed that the pond was near your property but not on it. Is it very far from your house? Now that they know it's there, I think you're going to be hard-pressed to keep them out of that clear, beautiful pond unless you fence at least part of your yard. If it's on an adjacent property, I wouldn't worry too much about it if they were our ducks and the property owner was okay with it. Ducks that are well cared for tend to know where their next meal is coming from and will return to their home when they finish swimming and foraging.
I loved the first video. Can't get the second one to play.
Our backyard butts up to the dam. It's full of fish and turtles. It's a community pond that the neighborhood owns, and we all love ducks. Our neighborhood flock had dwindled to 4 ducks (3 cayugas and a peking that you can see off in the distance in the first pic there). We're repopulating.
Not sure why the second video isn't playing. It's listed as public on my youtube channel.