Bill, last time I checked, the water temp was 59 degrees, and the fish were waiting for me to throw the feed; this was after 4 days of no feeding.
My last post about them hitting the sinking feed and not the floating feed, it was a warmer day, so the temps would have still be around 59/60.
I usually have them feeding until the temps get down to 50 degrees.
Excerpt from Robert Crais' "The Monkey's Raincoat:" "She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."