Probably indicates a shortage of phytoplankton. You may need to fertilize. Do a test to get the alkilinity level. If you are in pine tree country you may have to add lime prior to fertilizer.
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
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