I agree with above posters, it's important not to let them out on the pond until you have them trained to come to you with a certain lure. My ducks will come to me from anywhere when I bring out the mealworm container and give it a shake. I think the pond is too much freedom at this age and they are probably a little scared and confused as well as to what you expect, though they love to swim. No doubt the net would be terrifying to a duck. Make sure the area they are coming into is a place they can easily walk into and you don't have to lift them into it. Get them acclimated to getting treats from you. My neighbor has a pond and every year gets ducklings and never learned how to get them off the pond, so just gave up. They just get picked off one by one by wildlife, then she starts again the next year. It's not fear to these defenseless animals. When she got down to one duck last year who had been swimming alone in a tiny open area of her icy pond for two weeks, she caught it and gave it to me. That duck is not completely acclimated to the routine I have, and is the first one to come running to me for treats. She's afraid to be touched, and I respect that and don't try, unless I need to check her feet, but she will do anything for meal worms or peas! Good luck, hope you figure this out.