A question many people have about the Flood is how did both freshwater and saltwater fish survive? Individual fish from most species will die if placed in a wrong environment. If such a flood took place, its waters would have been a mixture of salt water, fresh water, and brines spewing out from the “fountains of the great deep” (Genesis 7:11). Fish obviously survived—but how?
To make matters worse for fish, the Flood certainly involved tectonically induced tsunamis (sometimes called tidal waves)—incredibly energetic shock waves in the ocean that traveled at great speeds and pummeled the land with towering walls of water. Fish are very sensitive to shock. Likewise, the Flood involved underwater mudflows, which even today are known to flow at up to 100 miles per hour, following an underwater earthquake or other disturbance. Wouldn’t the fish have choked in the sediment-filled water?
The Flood was primarily an episode of judgment on sinful mankind and on all of his “dominion,” including the earth itself, but it was also a time of God’s grace and salvation. Noah and his family, and two representatives of each “kind” of land-dwelling, air-breathing animal (seven of each “clean” kind), were protected and preserved on board Noah’s Ark. Outside, “all in whose nostrils was the breath of life, of all that was in the dry land, died” (Genesis 7:22). But what about the fish and other marine creatures? Obviously, they weren’t taken on board the Ark. How could they survive, particularly both fresh and saltwater forms?
As a matter of fact, most of them didn’t survive. Over 95 percent of all fossils are marine creatures. They died and are fossilized by the trillions. Many are buried in great fossil graveyards, tightly packed together, choked with sediments, buried before they had time to decay. Obviously, they didn’t live in the environment in which they died. They were transported by rapidly moving water and then buried in sedimentary deposits. But how could any have survived?
To read in full, please go to http://revivalandreformation.wordpress.com/2011/05/01/fish-in-the-flood-by-john-d-morris-ph-d/