4' in the wild but usually smaller in the aquarium - in my experience their growth rate slows down once they get over a foot - ive had mine for a couple years (at about 9-10in) and hes around 15-16in now and hes feed very well (feeders, krill, silversides, bloodworms) hes starting to put on more girth as he getrs older but for the amount he eats he doesnt grow that much