As the creator put it, a "hidden highway" appeared — a network of subsurface waterways that may have allowed the fish to ...

One small fish in Thailand could hold insights into the evolution of life on earth and how primitive ocean-dwellers developed into animals that could walk on land. Researchers from the New Jersey ...

Many grad students can sympathize with the blind form of the Mexican tetra. Researchers speculate they sleep only a few hours a night, because they simply don't have time to rest. Subscribe to read ...

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.

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 ...

Do animals that have evolved underground, completely isolated from the day-night cycle, still "know" what time it is? Does a normal circadian clock persist during evolution under constant darkness? A ...

Add Yahoo as a preferred source to see more of our stories on Google. A living specimen of the new species, Sinocyclocheilus longicornus, in a laboratory tank. A living specimen of the new species, ...

Researchers have equipped an underwater robot with a sensory system they expect will eventually prove effective, reliable, and energy-efficient in environments ranging from the sea floor to turbid ...

Small, silver fish called Mexican tetra (Astyanax mexicanus) live in some Texas and Mexican rivers. Some members of the species — eyeless and blind — can be found in nearby freshwater caves. Sometimes ...