They stocked a few in the river here about 10 years ago. I'm a couple miles from the river and haven't had any but a friend of mine has a 3 acre pond about a quarter mile from the river and he gets one or two every couple years. Not sure they would leave on their own as long as they had plenty to eat. He has plenty of time being retired and a deck high on the back of his house overlooking the pond. He sits out there and waits for them to surface close enough to shoot them. Sometimes it takes him a few days to get a good shot.
