Ever heard of darwins finches...? Lol so you use an evolutionist as proof of creationism? Thats..... Original, i will give you that.
the oh so obvious flaw in your example is that darwins finches evolved over many many generations to a gradually changing environment. In your example the salinity of earths oceans changed extremely rapidly in a matter of days, not generations. I know for a fact just how sensative salt water organisms are to the salienty of water. Thats a rediculious preposition.