Like Russ, the rusty color makes me suspicious (doubtful) of a dam leak. However, you could have a bottom or side leak that is leaching through a rocky area and exiting behind the dam.
Try catching some of it in a jar and see what settles out. That might tell you whether the "leak" is going through a rocky area.
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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