I am not joking when I say this but... Could sterile grass carp be the solution? I mean, a lot of oxygen depletion comes from vegetation decomposition. And although we are introducing these species into select lakes (maybe one to start off with for an test), the damage they may do is only short term if it is not successful.
You can say vegetation is a habit for aquatic insects, and this reduction will throw the ecosystem off for a bit in sure, but none of the stocked lakes are natural fish populations, so why not for an experiment.
I'm just bsing here so don't take my comment too seriously, but it's something to think about.
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