I am in at least 6 years since stocking SMB and think they likely have been spawning for at least 4 years. If my friends or neighbors ever pull out any thin ones, then I'll try to remove more. I have 2 newish ponds with no top predators and also a BG/LMB pond, so I can always find a home for some. If anyone nearby wants 5-10 small SMB for their pond, drop me a message. I think that I can spare them. Only started with 20 stockers in a 0.9 acre pond stocked at 10 per year in consecutive years (from 2 different hatcheries).