Deb,

Thanks. I'm coming at it more from the prevention aspect, as opposed to actual fish kill experience in my ponds.

I have observed for years the effects of red tide in our salt water fisheries here in Texas and have questioned biologists claims of oxygen depletion as the cause of red tide related fish kills....my theory, based on just common sense (dangerous I know), is that there is much more at work than DO levels....meaning toxic conditions produced by the organisms involved. Don't ever try to eat a salt water fish that has been feeding on certain reef organisms...its a mistake one only makes once.

If similar "red tides" ever get in our ponds in fresh water, its likely to be bad news in terms of fish kills, I'm afraid, in spite of all attempts at increasing DO levels...just thoughts of an idle mind. \:\)