There is no water source flowing into the pond. There is little watershed that hits the pond which is mainly rain filled.
I picked up 1100 CNBG from a fish farm, they were 2.5" at the largest. I did not see any other fish mixed in. Even if there were a few CC mixed, I doubt they would have already spawned and have offspring the size I am seeing.
Here is a video showing them rolling at the surface. This was the first day I fed them. About 15 minutes after I threw the food out.
