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Oct 12, 2019 at 22:23 comment added bob1 Note that the plants will be producing oxygen, not depleting it, at least during the day. Under eutrophic conditions in a still lake you might get depletion of oxygen during the night, but in general rivers are oxygenated by water movement over obstacles, not from the vegetation.
Oct 11, 2019 at 20:11 history answered Bogdan CC BY-SA 4.0