Once is stops snowing (jeez!), and warms up a bit, I am going to put my 4 ducks and mr. goose into the pond. They will be fenced unless actually swimming, and I plan on sticking a bunch of goldfish (we used to have some, but a heron came when the pond was low, and stabbed them all to death) into the pond. I hope that at least a few of them will grow, and filter the water, but wonder if my ducks understand how to eat fish without choking.... if the fish get bigger, will the ducks choke and die? or will they leave them alone?