Pond Boss Forums INTRO Questions & Observations Search for Jumbo Coppernose Breeding Stock

In my opinion it sounds like your problem, (smaller bluegills), may lie somewhere other than the particular strain of fish you currently have. Either northern or CNBG should achieve a size larger than 6". The pond is 40 years old, is it possible that the BG are stunted? I think an infusion of fresh genetics is generally beneficial, but if there are simply too many bluegills already present, then I doubt if better genetics will yield the results you are hoping for.