I once saw a study that was done in Texas. They compared growth rates betweem common BG, coppernose, and hybrids. The common BG was the growth winner. I stocked commons because I also read that Coppernose sometimes don't make it in certain ponds but nobody knew why. Don't have the information available to support either of these studies.

How will Coppernose do further North? Maybe you can write a paper in a couple of years. Good luck and have fun.