lol... Yeah, thanks for that. I am aware that everyone else's ponds might NOT be the same as mine. That is also true for every person on MFK that offers advice on any fish, either pond or aquarium.
It seems we agree that oxygen levels have a part to play. I'm not sure that 68 degrees will see them "struggle" to survive.
You have to consider a hatchery is a different kettle of fish, and NOT the same as a domestic pond. Having to sustain immense numbers in relatively small areas (compared to density of stocking in the wild), they have to maintain high oxygen levels (i'm not saying cooler isn't helpful btw), keeping a supply of cooler, oxygen rich water will aid that in a much cheaper way than having to airate the hatchery.
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