Well, I don't know if you would consider it a plant or not, but I'd be willing to bet that in a pond where the visibility is 24'-36" due to planktonic algae, I would say the Planktonic Algae is the biggest O2 producer in the pond.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).