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Why do oxygen escape quicker in freshwater that has salt added than in freshwater? Answered

I where told to give my fish a saltbath (half a teespoon salt added to a cup-250ml freshwater and stirred till it desolves and then added your fish to the cup) as I noticed he has finrot. But my question to the petshop guy was when do I know to take the fish out of the saltwater again as it is a freshwater fish. His answer to me was, as soon as he comes to the surface gasping for air... He said as salt in freshwater lets oxygen escape quicker out of freshwater... But my question now is, but why?? Please help me to solve this....

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