Larry said:
Thank you all for the replies. This gives me much to consider.
I do have some more questions right now, though.
Did the fish change or anything like that? I mean, there would be no physical separation between salt water and fresh water. Did all fresh water fish die out? Did all salt water fish die out? What was the nature of the massive body of water? What kind of impact would this flood have on marine life?
Some fish changed while some fish didn't. The coelecanth apparently didn't change.(which presents a major problem for evolutionism)
Some fish can live in both salt and fresh water. I don't know how deep you want to get into this discussion.
You can consider some of these options below;
1. Some fish can gradually become accustomed to a wide range of ambient salinities.
2. Some fish are an Euryhaline organism. They can live in both saltwater
(SW) and freshwater (FW). For example, the Cichlid fish Tilapia grahami is
found in SW but can maintain itself in FW.
Note: FW has 0 ppt (parts per thousand) of salinity and SW can be as high
as 35ppt of salinity. Most fish can tolerate a large range of this
salinity.
3. As the temperature of water increases a brackish water fish can live in
levels of almost no salinity. This could have occurred near a volcano.
4. Different individuals within the same species can have different salt
tolerances. This would have allowed the fish with the correct tolerance
to survive.
5. Antediluvian fish could have been more tolerant of saltwater that the
fishes of today. Micro evolutionary in salt tolerances could have changed
in the few thousand years since the flood.
6. Antediluvian seas were probably less saltier than todays seas.
7. The layers of FW to SW would have stratified in certain areas of the
globe. The fish could move up or down to adjust itself to the salt level.
8. During the flood sheltered cracks could have formed separating the
hi-saline water from the less saltier walter. This could have provided
protection for the fish and its fauna.
9. Only two of millions/billions?, a male and female of the same kind
needed to survive the flood inorder to repopulate the waters.