After giving it some thought, I think the die-off of the large CNBG was due to the extreme cold spell we had just a few weeks back. These are Florida strain BG and do not do well in a pond that was completely frozen over for days and days. It was so extreme weather here in Texas that I remember hearing that some 28 people also died in this storm. One was found in his recliner at home where there was no heat because of lack of electricity. We learned that windmills and solar here in Texas did not work. So if the storm was so bad to kill Humans, then I find it not so unusual to kill my Florida stained bg. My plans are to restock some cnbg when I pick up the Tp order.
My CNBG did not experience a die off, even in the forage pond where I fully expected the worst. Just found that good news today. I suspect mine must have come from Arkansas. If you can't find any from Arkansas, you are welcome to some of my cold-adapted breeders, they are just beginning to come shallow in pre-spawn now.