Lost my CC in the BG/LMB pond to a winter-kill under snow-covered ice quite a few years back and elected not to add them back. Mine did not reproduce either. I really need to fish the pond for LMB to see what I have in there. I do have a healthy population of BG which my neighbor keeps in check by harvesting 50-60 per year. I have seen a few small LMB on occasion when I feed the BG (irregular schedule), but never saw them take food.