Motalot, this is a good question. I can't find much on the affects of condutivity on fish, but pH is related to water conductivity. If the pH changes, the water conductivity changes. Rain water in its pure state is distilled water and neutral (pH 7), and its conductivity close to pure water. But when the atmosphere is polluted with sulfur oxide and nitrogen, the rain goes through oxidation with ozone or hydrogen peroxide before falling to into the lake and forms surlfuric acid (H2SO4) and nitric acid (HNO3). Rain water with pH below 5.5 or 5.6 is called acid rain. Some acid rain has a conductivity of 50 millisec/cm, while other acid rain of 5 can have conductivity of 100 millisec/cm. So, conductivity can be at different levels at the same pH. Now, how this affects fish, I am not really sure other than the fact that these pH changes that affect water conductivity will certainly affect a fish's comfortability. It has been proven paddlefish will avoid aluminium objects, and researchers think any large unprotected aluminium structure around locks and dams will interfer with migratory fish. Is this a electroconductivity dectection by these fish? Most likely.
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