What did the water look like (color and visibility) before the rain and after the fish kill ?
The water was surprisingly clear before this latest rain that seems to have triggered this. Normally this time of year I would be fighting a fairly significant filamentous algae bloom, but there was none. We've had a rough spring around here with record rainfall, but we had a small break a couple weeks back and that gave the wter time to settle and clear up. I figured that was why the FA had not taken hold like normal. The water turned muddy after all the rainfall, but still no algae. The night before the fish started dying the water was starting to settle down again and I could see the fish in the water down to a couple feet deep.
I know the farmer had just sprayed liquid manure (hog poop I believe) just days before this last rain. We had a river probably 30 feet wide and 2 feet deep running into our pond from his field during that rain.
I am now getting a bloom of what I think is blue-green algae, which is not normal for my pond. I had swirly patches of green "scum" floating on the pond last night along with several hundred more dead fish.
