A trade-off between tooth size and jaw mobility has restricted fish evolution, Nick Peoples at the University of California Davis, US, and colleagues report in the open-access journal PLOS Biology.

Blind Mexican cavefish became active in light while surface fish reacted to darkness, revealing how evolution rewired brains.

The fossil record has historically included few fish for about 10 million years after the mass extinction event 65 million ...

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 ...

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 ...

Over 300 million years ago, a minnow-sized fish died and fell to the bottom of a prehistoric swamp near the village of ...

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 ...

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 ...

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 ...

Scientists have uncovered the secret of the Amazon molly, an all-female fish species that has survived for 100,000 years through cloning, defying long-held evolutionary theories.

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 ...

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 ...