Cecil, I've been following your quest to raise larger fish for some time. One giant of any species can be a freak and lucky catch. However, you are doing it consistently on various varieties. You mentioned the brook trout and now the yellow perch. Congratulations!
But how are you doing it? We are taught that it takes the right genes, the right environment and a plentiful food supply to grow giants of any species. Oh yeah, that specific fish with the right genes had to somehow be one of the very, very few fry that didn't get eaten or die of illness or(?). Thats usually luck. Wildlife breeders work very hard and keep careful, detailed records in their quest to grow big deer, bass, elk, etc. I even heard of one guy that is using selective breeding to grow the ultimate fighting chicken. Had you done it only once I would say you got lucky. But, a larger one may be in your ponds. You aren't a breeder or the fish wouldn't have gone on ice. Therefore you are doing the right things with food and/or environment. When you come back down to Earth would you please take a moment to reflect and tell us how you are doing what we can't do?
Again, Congratulations!
Dave