To me problem is that the harbour is all but closed with only a very small inlet/outlet for the water to flush.
Having so many fish in there depletes the DO quicker, and when the water temperature rises its drops even more and then the fish become stressed and try to suck even more out of it.
I think its a fine site to grow fish but sounds like there might be too many there, especialy if the gov has upped the numbers again..
Just my 2 cents
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