Ken Henneke stocks Rio Grande Perch according to his website.
There's very little information available on them as a pond species. They're a cichlid, but wikipedia indicates that the RGP are a little bit more cold-tolerant than Mozambique Tilapia, only spawn once a year, and mature at 6" or so. Maybe it could overwinter in a central Texas pond? Not sure how they'd do with serious predation.
It'd be interesting to try them out and see what happens. If you can't find a hatchery with them you could check out the Guadalupe River and try to catch some.
