in that its known that the salinity of the fish is similar to the salinity of the sea water
Actually, it's known that the "salinity" of freshwater organisms is that of fresh water, and such organisms die in water that has significant salt (but less than the oceans). It's also known that the "salinity" of marine organisms is that of the ocean, and such organisms die if there's less salt (but more than in fresh water). In other words, all water-dwelling organisms would die in a world-wide flood. One of the menay reasons why such a flood never happened.
Your writing style makes you appear very ignorant. The content of your writing makes you appear even more ignorant. If you want to be taken seriously, if you want to discuss rather than preach, clean up your act. Not intended as an insult, just an observation.