This testing of the different feeds is something I'm doing. I'll be the first to say it is far from scientific though. My hatchery uses Silver Cup trout food, mainly because that is what our DLNR provides us. The hatchery fish are raised indoors, under lights 24/7 using open water systems. I took 200 of these fingerlings, 3 1/4" - 4" and am feeding them Aquamax 500 at Bob's direction. I run a closed system outdoors so there are too many variables to call it scientific. None the less, it will be interesting to see which set of fish grew the largest.
I appreciate all the information that has been shared in this thread. Good knowledge for all.