Northern sourced LMB are typically well adapted to our climate. I am at 1220ft in WNY, and have a similar freeze thaw timeframe.
All it takes are two BG and some candle light, and the next thing you know you have 10,100 BG. You need fish with a large gspe to take on those little nippy jerks.
I plan to do some netting in the pond soon to see what's going on. The posts here would lead me to think the BG probably spawned by now with no predator competition. I stocked them in early May.
I had some extra maintenance done around the pond to shore up the berms and that clouded the water for now so I can't really see what's going on.
