According to Lusk, only about 10% of the eggs laid, hatched, etc survive to get large enough to spawn. Natural mortality and predation are to blame. But, that keeps the water from polluting. Your initial stocking should be better, assuming you feed, but it’s not 100%.

It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.

Without a sense of urgency, Nothing ever gets done.

Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP Grandpa