Shiners being overstocked would have a good chance of survival and establishment IF there is good sized (10-20% of surface acres)vegetation cover in some shallow (<2' deep) areas. Fatheads will reproduce heavily, but with small bass, they will be wiped out after a year or two even if stocked heavily...larger fish won't target them as much if there is other, larger forage available. (Too much energy expended for the calories gained)
A 20" bass would swallow a 14" trout...or anyhting it can get all the way into it's mouth...trout are fairly small in diameter and have no spiny bones as mentioned earlier (fusiform).
