I agree with the water volume being too low for the fish. With the small amount of water in the pond, the whole water column probably turned to polymer soup.

If it was my pond, I probably would have pumped water out instead of adding more. Then treated the whole pond basin as a "new" pond, then waited for it to fill again.

My personal pond, when I bought the place, was supposed to be 20' deep. It turned out to be 7' at the deepest part. When I renovated the pond, I dug down to 22', knowing that the pond would drop between 5' and 7' in water level from wet spring to dry fall. I did my best to save the fish that were in the pond during the renovation, but if they had died, I wouldn't have given it a 2nd thought.

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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).