Sorry about that.

Okay I'm not reading Sam's answer first. So here goes.

1. Obviously one does not need to worry about fish as following only about 1400 years of existance the oceans wouldn't be that salty so fresh water fish basicaly survived everywhere back then.

2. After the flood occurred the water level dropped siqnificantly. If you look at a map of the oceans you will see an all the way around the world a sudden drop off. This is where the old beach line used to be and if one looked at this beach line there are very few places where one couldn't get than by just walking.

3. How much trace would there be if the evidence was under the ocean? Most animals are hard to find as fossils on land, think how much harder it would be to find them on the ocean floor. Also I haven't heard of many expiditions to the ocean floor in search of fossils.

I hope this works. Sorry about being late and all. Completly forgot I apologies.

God Bless,
-Aaron