I personally would do a compleat drain, and restock but the folks whos pond it is are 100% against that option. It also is in a residential area and the sight/smell of a drained pond and alot of dead fish would not go over too well. That being said I am a bit limited in what I can do. One thing I neglected to mention that may be important is that there is substantial weed growth over at least 50-60% of the pond in the summer if that makes and impact. I am still running the jug lines but the turtles keep getting the bait before the fish do.