Update - Just an short update for those of you that might be curious. When my fish arrived in May they were a little smaller than I had hoped (6"-8") but they looked very heathly and started feeding within minutes of entering the pond.
I have been feeding them Purina Aquamax since they arrived. I initially fed once per day (evening) and about a month ago added a morning feeding, and a week ago added a third in the late morning. I'm trying to compensate for the loss of bugs due to cold temperatures.
The growth rate on these fish is really quite amazing. I caught a 17" fish last Saturday and my son caught 3, 15" fish the same day.
Cecil, on a post earlier this summer you were inquiring about 1 feeding vs 2 per day. It looks like my fish have significantly "fattened" up in the last month since I added an additional feeding. I can't give you any scientific data but I do think the additional feedings have had an impact.
I do feed only small amounts at each feeding to ensure all of it is quickly cleaned up and doesn't add too much waste. Perhaps more food once per day would have the same effect.
Anyway, I consider this first season a tremendous success and thanks to all who have posted so much great information on this site.