"John" wrote in message
...
snip
My pond is approximately 2250 gallons with koi, goldfish and orfe. This
only seems to be affecting the koi though. I am in the UK and
temperatures
have been very high recently, with the water temp in the pond reaching
about
24 C.
snip

I am no expert...but it seems like the fish kills over the past few
weeks...all authors have mentioned warmer then normal temps in their area.

BV.