The point I was trying to make was that on the way down from the cloud
to your pond, the rain should become saturated with oxygen due to the
extreme gradient between the air (210,000 ppm) and the maximum
concentration of oxygen in water (9.7 ppm) so I doubt oxygen
deprivation is the cause of the fish deaths when it rains.
If you feel motivated enough, here is a page that has a calculator to
find the maximum oxygen concentration at a given air pressure and
temp:
http://antoine.frostburg.edu/chem/senese/101/solutions/faq/predicting-DO.shtml
Geoff Kimber
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