Mtn, your welcome, I'm just happy I could finally help someone, I have gained so much from these people and don't have much to give back as I am fairly new to this and also a lot of the topics are regarding fish that don't live here. As for your trout, I also find it strange that you saw no risers. Even though they spend only 10% of their feeding time on surface, you should still see some. Evenings until sundown is when I see most action on my pond, it gets pretty boiled up if there is a hatch going on. Even with predation and normal mortality, you think you would have seen some. Six years is about it for pond trout from what I've learned, so they would be on their way out by now anyway. It seems you have a challenge ahead. Enjoy it, Wood.