If by "market kind" you mean those seen in a grocery or restaurant, then yes, even bigger. Of the dozens (hundreds?) of native species, many get to 8". Several varieties not only have blue accents, but red, orange and olives and are quite striking. Local varieties have a slightly less favorable tail/body ratio than Louisiana dads, but make up for it with big, meaty claws.
Back in the business? Yeah, I'd love it. Problem is, there's only so many desirable natural springs with suitable surroundings. At one time, most were utilized for aquaculture. Now they're becoming mere lawn ornaments for the well to do. Way out of my league.