I've seen it on one of my perenially dry ponds. It looks like someone has just flushed a toilet. I've never messed with it so can't advise of a sure thing fix. The normal fix is for a couple of feet of well compacted clay. Compact the clay in layers.
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
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