Thanks for your reply. I have taken a water sample and will be looking for a place to send it.

The water covered the newly excavated areas in early March. The fish seemed healthy and active and I didn't start finding dead fish until the pond completely filled in Mid April.

This pond is filled by surface runoff. The entire watershed is on our property and consists of native grass pasture land and some open areas of red clay/shale. We do not spray any of the watershed because the native grasses are thick enough that weeds are not a problem.

Water clarity is a problem after heavy rains because of the red soil. Usually the pond is very clear except right after a rain. The water has been tea colored during this fish kill. It is unusual for the water to be this color. The submerged water vegetation is unusually brown rather than its normal bright green.

I don't know the actual O2 and pH readings, but do know they were in the green part of the scale on the game rangers gauges and he commented that both were acceptable. We took the readings mid afternoon at about 6 ft. depth one day after the largest numbers of fish died.

Western Oklahoma. 15 acre 60 year old pond. Well established with fathead, bluegill, bass and a few large catfish. Aeration in the deepest (14 ft.) 1/3 of the pond. Most of the pond is 6 feet. Feeder.