Originally Posted By: Bill D.

I have wondered about that. Is it lack of DO that kills the trout or the temperature or both? If you could somehow raise the DO level in 80 degree water, would they survive?


It's a problem of both. Trout need a minimum of 5.0 ppm O2. Take a look at a DO chart and see where that falls.

A client that has both surface agitation and bottom diffusers has had Golden Rainbows living in 78 - 79 degree water, but they did not make it through the summer. O2 was at saturation levels when I checked it.

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