Sue:

Possibly, but the pond shouldn't be that devoid of O2 at the depths already. It is just warming up to the mid '70's after the long winter, and the pond would have turned over already once this Spring when the water went from <39�F to >39�F at the surface.

I'm wondering if someone didn't treat for aquatic vegetation while the fish were on the beds (in the bedding area)?

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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).