That looks like P.I. to me. I don't usually pay much attention to it, since I am non reactive.

I fed the fish and watched the water recede. I have lost over 2-1/4 inches in three days. The soilfloc did not seem to help in the long run and the water loss has worsened since March. There is water coming up in the neighbor's field well behind my dam, but none at the toe of my dam. Might be a spring that was always there, or might be my pond. The field was an impenetrable thicket until he cleared it about three months ago, so water wasn't seen until after the clearing operation.