In general, anglers tend to focus too much on the species they want to catch, rather than on health of the ecosystem and the overall food web.
Stocking 500,000 Florida LMB won't result in much unless there is a healthy food web in place to feed them well so that they grow quickly.
The Calcasieu River is a complicated ecosystem with a lot of management challenges, as described here:
http://www.wlf.louisiana.gov/sites/d...pdate_2014.pdf
Hopefully, the length and growth study will become available in 2015, as promised by LDWF. Having genetics for large, fast growing bass is only half the requirement. All these bass need to eat, and the Calcasieu food web may not be ample to feed them.
It's something of a self-correcting problem. If the adult bass in there are now are not well fed, they will eat the fry and move the system closer to balance with very few of the fry surviving to compete as adults.