Aaron, you do have a valid point, the degree of gain would be my only question. Would it be getting your fish to their genetically allowed size faster or do you think that they will stretch their size window?
That is where I am confused. I don't know if you read the thread about the tank raised tilapia, but the amount of protein they were given was very high and they grew extermely fast. But, will they exceed their genetic disposition just because of food, probably not.
Look at Bruce's bluegill, he is working all of the angles to create fish that exceed normal genteric limits, is it working?
One other maybe factor, my pacu store fat, they can store lots of fat, so by feeding them as much as they could/would eat might allow me to grow a world record fish. But, I could probably do it on 4lb test line.