roughly 1st year about 1.5' and 5 lbs
2nd year - 2'-2.5' 15-20 lbs
3rd year - 3' ~30 lbs
that how mine went in a 4000 gal indoor pond
in the wild they max out at ~3.5' and up to 60 lbs
they are the most farmed fish in North America for a good reason because they turn 1 lbs of high protein food into 0.5 lbs of body mass in the first year or so!