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Index to Creationist Claims,  edited by Mark Isaak,    Copyright © 2004
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Claim CH541:

Present-day fish and other aquatic organisms could have survived the Flood. Many freshwater fish can survive in salt water, and many saltwater fish can tolerate fresh water. The floodwaters may have been layered by salinity, allowing others to find their preferred habitat.


Woodmorappe, John, 1996. Noah's Ark: A Feasibility Study. Santee, CA: Institute for Creation Research, pp. 140-152.


  1. Layering of the floodwaters contradicts the Flood model, which proposes that the Flood was turbulent enough to stir up sediments on an incredible scale. The model proposes that the floodwaters became the present oceans, so all the water flowing into the oceans would have ensured that they were well mixed. The freshwater fish would have had no place to find fresh water.

  2. The fact that many fish can tolerate wide ranges in salinity does not mean that all can. Furthermore, the problem applies to more than fish. Freshwater invertebrates are commonly used as indicators of the health of streams. Even a tiny amount of pollution can cause many species to disappear from the stream.

  3. Aquatic organisms would have more than salinity to worry about, such as the following:
  4. Woodmorappe predicted a sudden extinction of fish caused by the Flood. "[P]resent-day marine life is but an impoverished remnant of that which had originally been created and had existed before the Flood" (1996, 142). However, the actual pattern of extinction we see shows convincing disproof of the Flood. Living genera become decreasingly represented in fossils as one goes deeper in the geological column, until there are no recent genera in the Triassic, and only about 12 percent of recent genera have any fossil record. Extinct genera continue back to the Cambrian (Morton 1998a). This pattern exactly matches what one would expect from evolution. It contradicts a global flood, which should include modern fish more-or-less uniformly throughout the flood-deposited sediments.


  1. Isaak, Mark, 1998. Problems with a global flood, 2nd ed.
  2. Morton, Glenn R., 1998a. Fish cause problems for the global flood.
  3. Morton, Glenn R., 1998b. The global flood produces acidic flood waters.

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created 2003-6-29