Thanks for the comments Bruce and Bill.

11 to 14 years for BG! I had no idea they would live that long.
Whoa! They might outlive me. \:\(
Trout probably 4 - 6 yrs?

Interesting you mention SCUD's as a beneficial macro-invertibrate. My experience with these critters is limited, but it seems I always find large populations associated with "watercres" (I think thats the plant). Bill, your best guess for enhancing environment for SCUD's.
Great forage for trout also!

Ed