FWIW- Here's my experience with BH. I never knew I had them in my ponds until I had a winter kill. My LMB froze out 5 winters ago. I decided to try something new and not restock LMB not knowing I had BH in there. I think the LMB where eating them as fast as they were born. About 3 summers ago, for the first time, I noticed a pod of bullheads swimming. Fast forward to today, I am now forced to either add a predator like a LBM or kill and start over. THOSE BH ARE EVERYWHERE!
Bottom line as I see it...If you ever have a fish kill (DO sag, super cooling, or such) the BH will most likely survive. And without predation those bad boys will take over very quickly!
As much as I like eating those ugly buggers, I would avoid them at all costs.
