Deep within the dark caves of northeastern Mexico lives a fish that has spent hundreds of thousands of years adapting to a ...

Along the murky bottom of the Amazon River, serpentine fish called electric eels scour the gloom for unwary frogs or other small prey. When one swims by, the fish unleash two 600-volt pulses of ...

Scientists have discovered that female guppies choose males with uncommon color patterns to drive the evolution of their ...

Reef fish evolved the ability to feed by biting prey from surfaces relatively recently, a UC Davis study shows. The innovation has driven an explosion of evolution in reef fish. Image shows a rainbow ...

Scientists have uncovered the secret of the Amazon molly, an all-female fish species that has survived for 100,000 years ...

If you're reading this sentence, you might have a fish to thank. Fish were the first animals to evolve jaws. They use their jaws primarily to eat, but also for defense, as tools—such as to burrow or ...

As the creator put it, a "hidden highway" appeared — a network of subsurface waterways that may have allowed the fish to spread underground for millions of years before becoming isolated, eventually ...

A new study of the freshwater greenfin darter fish suggests river erosion can be a driver of biodiversity in tectonically inactive regions. New findings could explain biodiversity hotspots in ...

Why are there so many of species of coral reef fish? According to a new study, it’s because about 50 million years ago, some fish figured out how to bite food from hard surfaces. Evolution doesn’t ...

A study published in the Nature journal alters how the evolution of fish has been historically understood. Fossilized fish and other sea creatures have often been pivotal in new scientific discoveries ...

This new international study is calling for a major rethink of how rivers are managed, arguing that fish are not just passive victims of environmental change but active participants in a feedback loop ...

A scaly, finned creature that lived in water 385 million years ago descended from four-legged land animals, in a clear example of a “backward” step in evolution. Some fish grew legs and developed the ...