We found a remote cave system filled with something incredible – blind fish adapted to total darkness. In this video, we swim ...

The discovery of the blind fish challenges previously held theories on fish dwelling in subterranean locations. “It has always been assumed that cave fishes exceeding 350 mm would be most ...

A blind cave fish that has spent millions of years underground isolated from evidence of day and night still has a working biological clock, albeit an unusually distorted one, scientists find.

The Mexican cave fish (code name: Astyanax mexicanus) isn't just blind and eyeless, it also has a shrunken brain. Exactly how it ended up that way is a bit of an evolutionary mystery.

Borowsky crossed blind fish from one cave, Molino, with those from Tinaja cave, about 100 kilometers away. When the offspring were just over a week old, 39 percent of them passed his eye test.

These cave fish have elevated levels of an enzyme that adds methyl groups to DNA compared to surface fish. This enzyme is expressed in the developing eye, where it decorates genes important in eye ...

Every group of Mexican tetra fish speaks with a different accent. Scientists studied both the blind cave-dwelling populations and those that live in rivers. They all communicate using a series of ...

Astyanax mexicanus cave fish have adapted to an incredibly tough environment: chilly, pitch-dark caves that flood about once a year, providing brief feasts separated by long periods of starvation ...

And blind cave fish living in what is considered the largest cave in the world, Hang Son Doong, in Vietnam. It took the crew two days of trekking through the jungle, carrying provisions and gear ...

But the blind cave fish retained some basic structural components of eyes. (Likewise, modern snakes, which are legless, retain useless pelvic girdles that once supported their ancestors' limbs.) ...

The results showed that the loss of the cave fish's eyes saved approximately 5 percent to 15 percent of its total energy budget depending on the age of the fish, according to the study's abstract.

In this video, we swim through a remote cave system filled with blind fish—creatures that have adapted to total darkness over generations. The water was cold, the passages were narrow, and the ...