Some seriously obsessed betta breeders, like koi or flowerhorn breeders will feed lots of "culls" to some big fish. Simply because you can't keep an entire spawn, but you need a big spawn to even get one or two nice fish to breed. Some will do like dog breeders and sell "pet" quality fish, others will cull everything but their own show fish to prevent competitors from getting similar fish.
We don't need to see it, though. We have people here who call betta "babies".
IMO you should not breed deformed fish. Its up to you whether to cull or house the unwanted for life, but never release tank fish into the wild.
Last edited by emc7; 01-22-2011 at 09:59 AM.