Tom, I don't have thermometers listed in the catalog, but I have plenty on hand...do you want to be able to read bottom temperatures? Did the Trout die, or do you just not see them?

I agree that physical removal of the surface algae mats is the best approach...it's just that not everyone is up for it. How extensive are your algae mats? Last I knew, you didn't have any. As long as you're only treating a small portion of the pond I think that with the kind of water outflow that you have, the release of nutrients from the decaying algae will not be very significant.

Mike Robinson
Keystone Hatcheries