Hi. I'm no expert, but I have a trout pond in Ontario, Canada. It is not spring fed, so it actually gets much warmer than yours would ever get I assume during summer. I stocked it with 80 8-10" brown trout about 3 summers ago. The fish are now 22-25" and seem very healthy and full. We did not stock any forage fish before stocking, but the pond had an abundance of aquatic insects, minnows, and some crayfish. I would say my trout did very well without any need for baitfish being added. I also know lots of local trout pond owners pellet feed, which might be an option for you.
