I have a natural salinity in my ponds at 5 ppt. This is about 1/7 of seawater. Bad for drinking but great for fish. I've never seen bacterial infections or fungus on any of my fish. The ones I raise indoors NEVER, EVER get sick. One funny result is that when I handle these fish they are so slimy you almost can't handle them. Lusk told me it's because of the salt. I'd be happy to provide a breakdown of my previous water analyses. Maybe you could model your pond after my water. I'd try it on a small scale first. Maybe an aqaurium or something? Then you could add to your pond incrementally just to be safe.
