I have a small 1/2 acre pond that I stocked with blues and fatheads. The hatchery guy told me that they were accidently mixed with channels. He picked them out one by one but when I released them, I saw one channel.
I guess there were two channels because the NEXT summer they found a place to spawn and I had thousands of tiny channels.
The first summer I had a bnch of blues that took a long time to start coming to feed and stopped in the heat of summer.
The second summer I had blues coming up verociously for a short time too and then found they only wanted to come upn in evening. I also had all the baby channels and caught a parent at two pounds. The blues were closer to a pound.
The third summer I didn't feed as much because I wanted to thin everything out. The channels were always there and the blues maybe were. Blues two pounds.
The fourth summer (now) I had blues feed with the channels for most of the year but disappeared when it got hot. The blues are two to three pounds and I caught a few channels at about two pounds!
The hatchery guy told me that channels grow faster until the blues reach two pounds. I think that showed true. But then I had a screwed up pond with all the baby channels and I fed less. I think the blues ate the hell out of the fatheads (which don't produce like high protien feed).
I have the channels thinned and hope next year I can get some growth out of the blues.

I also put some of the baby channels in another small pond with hybrid striper and in two years I caught a four pounder. The smallest brothers and sisters in the othe pond are still six inches. Point: They grow by how agressive they are.