Greg,
Its because of two factors. Not enough suitable spawning ground, and those pesky stocker rainbows eat up all the eggs.
Smallies need gravel to breed, wich most the suitable gravel beds in the lake is above Roark. Up there those stockers swarm like a plague of rats on anything edible. Most of thier spawning takes place on gravel up all the creeks. They all have gravel someplace.
Cats Basically have two places to spawn, Bull and Roark. All the other inlets dont get warm enough. Cats need super warmed water,80 degrees or so to have a successful spawn.
Its hard to believe that there is so many huge cats in the Red River up north. But obviously they find enough tributaries to make it happen.
Finding species that will be self sustaining in Taney has been a dilehma since the construction of Table Rock Dam. A Dilehma that will never be satisfied. Especially now that they have trout to fill the void.
It would be nice to have some "Put and Grow" Cats and smallies to go along with the trout.
Wouldnt it?