How Did Fish Survive the Flood?

Have you ever for a second thought of how fish survived during the flood in Noah's day? i do like to share this thought hope you find it interesting!!!!!!!!!

If the whole earth were covered by water in the flood, then there would have been a mixing of fresh and salt waters. Many of today's fish species are specialized and do not survive in water of radically different saltiness to their usual habitat. So how did they survive the flood?
Note that the Bible tells us that only land-dwelling, air-breathing animals and birds were taken on the ark (Genesis 7:14-15, 21-23).
We do not know how salty the sea was before the flood. The flood was initiated by the breaking up of the “fountains of the great deep” (Genesis 7:11). Whatever the “fountains of the great deep” were (see Noah's Flood—What did all the water come from?), the flood must have been associated with massive earth movements, because of the weight of the water alone, which would have resulted in great volcanic activity.
Volcanoes emit huge amounts of steam, and underwater lava creates hot water/steam, which dissolves minerals, adding salt to the water. Furthermore, erosion accompanying the movement of water off the continents after the flood would have added salt to the oceans. In other words, we would expect the pre-flood ocean waters to be less salty than they were after the flood.
The problem for fish coping with saltiness is this: fish in fresh water tend to absorb water, because the saltiness of their body fluids draws in water (by osmosis). Fish in saltwater tend to lose water from their bodies because the surrounding water is saltier than their body fluids.