Evolution Made Cavefish Go Blind? | The Institute for Creation Research

Evolution Made Cavefish Go Blind?

Evolution maintains that as more time passes, living things evolve to acquire better and more useful traits. As such, shouldn't the loss of a useful trait, such as eyesight, be regarded as the opposite of evolution? Not so, say recent news reports on blind fish.

Biologists compared DNA sequences from 11 populations of cavefish (Astyanax mexicanus), which are a blind variation of the Mexican tetra fish, to 10 related fish populations that have the ability to see. Since they can interbreed, they "are the same species."1

A New York University news release attributed the fishes' loss of sight to "convergent evolution," which makes little sense if evolution, as neo-Darwinists describe it, is supposed to generate new features and functions.

The blind fish do not trace their lineage to just one blind ancestor. In fact, the study authors wrote in BMC Evolutionary Biology, "The results also demonstrate that cave populations in the region studied arose at least five times independently and derive from two different ancestral stocks."2

Lead researcher Martina Bradic said, "Whatever the advantage of the eyeless condition, it may explain why different populations of A. mexicanus cave fish have independently evolved the same eyeless condition, a striking example of convergent evolution."1 The study authors also wrote that these fish "will continue to be a rich source for study of adaptive evolution."2

But obtaining the fish sight system required an input of a massive quantity and quality of information. And making the fish blind merely required the loss of some of that information. How could attributing these opposite processes to "evolution" be scientifically accurate?

The study of blind cavefish can undoubtedly contribute valuable insight into the genetics of trait variations and the fishes' potential to adapt and survive in varied environments. But because evolution is supposed to make new traits or develop new and useful genetic information, mere losses and variations should not be called evolution.

References

  1. Advantages of Living in the Dark: The Multiple Evolution Events of 'Blind' Cavefish. New York University news release, January 20, 2012.
  2. Bradic, M. et al. 2012. Gene flow and population structure in the Mexican blind cavefish complex (Astyanax mexicanus). BMC Evolutionary Biology. 12: 9.

* Mr. Thomas is Science Writer at the Institute for Creation Research.

Article posted on February 7, 2012.

The Latest
NEWS
Great Unconformity Best Solved by Global Flood
The Great Unconformity is one of the most baffling mysteries in the geological sciences.1 It is marked by a massive surface of erosion that...

NEWS
ICR’s 2021 Science Expedition Update–Dinosaur Fossils
A team of 11 people from the Institute for Creation Research is currently traveling on a multistate science expedition to dig up fossils, conduct field...

NEWS
ICR’s 2021 Science Expedition Update
A team of 11 people from the Institute for Creation Research is currently traveling on a multistate science expedition to dig up fossils, conduct field...

NEWS
ICR’s 2021 Science Expedition Begins!
The Institute for Creation Research launched its 2021 multistate science expedition last week as a nine-member team left the ICR headquarters in Dallas,...

NEWS
Inside September 2021 Acts & Facts
Why does ICR focus on scientific research? How could paleontologists mistake a lizard fossil for a dinosaur? Is animal death before the Fall theologically...

ACTS & FACTS
Creation Kids: Beauty by Design
Christy Hardy and Susan Windsor* You’re never too young to be a creation scientist! Kids, discover fun facts about God’s creation with...

ACTS & FACTS
Defend Your Faith with ICR
Have you ever heard a pastor question the historical nature of Genesis? “The days of creation weren’t really 24 hours long. The Bible is...

ACTS & FACTS
Animal Death Before the Fall?
Both the Old and New Testaments teach that death entered the world when Adam ate the forbidden fruit (e.g., Genesis 2:17 and Romans 5:12). Since fossils...

APOLOGETICS
Transmitting Truth in a Modern Pagan World
We share the world with modern pagans who worship the sun—or idolize an imagined primordial Big Bang—so we need to be truth witnesses unto...

ACTS & FACTS
Waco Mammoth National Monument
Hunters in the 1970s discovered mammoth bones exposed in sediments near the confluence of the Bosque and Brazos Rivers in north central Texas. They...