Update for Ewest,
Since my last post, I've been tossing a small handful of pellets into the pond on a daily basis. This usually has taken place in the late morning...10:00-10:30. With the sun sinking on the horizon, the majority of the pond does not see sunlight till late a.m.. No BG action (feeding) has been observed. Todays surface water temperature was 50 degrees.
My neighbors were down this past weekend and we tried to entice the BG with worms.....nothing. I suspect they found the Nyquil and have powered down for a winter snooze.