Rex, it would be interesting to stock both mature CSBG and pure CNBG in a pond in the "transition temperature" zone...
![grin grin](/images/graemlins/default/grin.gif)
... The least that would happen is to get an "intergrade spawn" that might result in more growth characteristics plus a tolerence for colder temperatures.
Why don't you give it a shot?
![cool cool](/images/graemlins/default/cool.gif)
Interesting!