To me it seems silly to ask what the temperatures were as it is obvious to me they are quite a bit warmer than norther climes, so he is able to feed. I will take a stab and say if the fish are accustomed to floating pellets they are able to utilize them down to lower temperatures. What is the threshold temperature in his pond at which the fish wont gain from food? Who knows, I'm sure it depends.

If I stopped feeding my aquarium fish through the winter, they would not be happy with me. They are quite happy with their blood worms and flakes 2x a day and sit at 81F most of the time (except for the past few weeks where it has been down to 78, the heaters cannot keep up!).