I don't knoe how big they are here, I haven't found any. I do have a line on some south a couple of hours from where I live. It is a place on the Missouri, below a dam.
I am thinking of gearing up, and going camping for a few days and find out.
They make some big cats in the south. I grew up in Oklahoma and saw two huge fish, one was an alligator Gar that was about 5.5 feet long, and a cat my neighbor caught on a trot line. He said he figured it weighed about 90 pounds. It was a big fish.
I just think the fish are bigger in the south, as long as the water temp is above 70 degrees or so, all they do is eat. When they eat, they grow. Up here the water temps gets fairly cold, and then the runoff from the snow keeps it down.
But we do have trout, and south of me is the Kokanee Salmon. A small landlocked salmon that is great smoked.
bob