Hi Anthropic
My spring runs consistently at 10c in the summer. That’s about 52 F. A good temperature range for growing trout. I have never seen it go above this temp but I’m sure a pond will gain “heat” as the exchange will be slow.
Although I haven’t measured the O2 yet the trout that I raise in a 20ft fibreglass tank being fed by this spring so very well. I have about 50 (now 2 lb) trout in there since Sept 2018. I do plan to run the water from the main spring thru a degasser to add ambient oxygen. If I break up and fall the water through approx 20” of biomedia it should hopefully reach near 100% Saturation.
However, I will try to get a reading on the O2 soon. Thanks