They won't reach market size that fast...period. If you need to have your crop make it to market at one year, you need to change species. This is an awesome fish, but it will simply take too long to grow. A pilot program is what you need first to show you the challenges and build your experience.
But again, if you have to have a return in one year, this isn't the fish you want. Growth rate and feed conversion simply aren't high enough.
Good luck.