It appears the Red Sea (30%+ salt water) has natural fresh water vents. There are organisms at the bottom of the Sea adapted to the salt. Some live near the vents and tolerate the gushes of fresh water.-http://blogs.scientificamerican.com/artful-amoeba/2011/10/09/fountains-of-life-found-at-the-bottom-of-the-dead-sea/?WT_mc_id=SA_DD_20111009