I think you probably did have a fish kill. At least, all of the causes were there.
No sunlight penetration for weeks can easily do it and that could be where the adult bass went.
Like others, I expect the Algae is a symptom, not a problem.
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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