Thank you for the replies so far.
The pond is a little more than 1/5 acre, dug September 2006. It is 9 ft. deep in the middle and has a shallow portion that is about 3 ft. The water is thick like chocolate milk. We put Pond Clear in it twice a month, but it hardly phases it. It has a clean bottom with nothing that you would call "shelter" for spawning. I'm not sure how much to encourage spawning based on the size of the pond. Especially because we are throwing back most of what we catch.
We see a pretty active show of bluegill when we throw out the fish food and the bluegill love cleaning the night crawlers right off the hook without even pulling the bobber under. I haven't seen any bass since April, and that one was only 6 inches. One swallowed the hook so deep that we just cut the line, so I don't know if it could have survived or not.
It was once guaranteed at least 3 to 5 cc caught in an hour's fishing, but lately they have all but stopped biting. It may be that I fish so often (I love my pond!) that they are tired of night crawlers. Saying that, I caught two yesterday, so I guess I'm expecting too much to want to catch "every time".

Oh, and they are cc, not bullnose, that I'm pretty sure of. I compared a picture of a cc my grandaughter caught with a picture online of cc. It has the forked tail. The color is silver with the spots. I'll try to download a picture of the next one I catch so you can verify and tell me if the ratio of growth looks right.
So if I understood you right, the 6 inch and the 15 inch I've caught are both from the original stocked fish? It's too soon to expect any cc little ones? wow
I guess it's not too surprising that I haven't caught any bass because I've used minnows only once, with no luck, and none of my lures have worked, so I haven't used them much. If there are any left, how big do you think they are? They've been on their own for food, with plenty of bg, frogs and insects.
Thanks again for your replies. I really appreciate them.
Janan