planktonic bloom consists of tiny organisms that reproduce. They are consumed by larger organisms and on up the food chain. They are actually the food base for whales. That must take a lot of them. They reproduce rapidly and can be a problem when they die in great numbers. Dying/rotting can suck up O2 and can become a problem but only when there is an infestation. This is an incomplete answer because it can be fairly complex.

Last edited by Dave Davidson1; 09/11/20 04:38 AM.
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