Gulf killifish have made a stunning comeback in Houston with the help of genetic mutations imported from interspecies mating with Atlantic killifish.

Fossils reveal the quick death of plants and animals from a massive surge of water after the impact 66 million years ago, which is thought to have spelled the demise of dinosaurs.

Nearly 50 years after its development, only a handful of creatures have passed the self-awareness exam. A new attempt with fish highlights a debate over the test’s use and meaning.

Freshwater fish suffer from low levels of oxygen in the country’s rivers, while bats are unable to survive the extreme air temperatures.

From cellular self-digestion to the effects of exercise on the brain, our features editor picks her favorite art custom-made for the magazine.

Fish scales follow a model famed computer scientist Alan Turing developed to describe patterns observed in other animals’ feathers, spines, and scales.

A University of Georgia fisheries researcher, who is head of the school’s program to farm-raise sturgeon and sell their salt-cured eggs, is expected to retire this week.

Fish stuck to coastal habitats for nearly 100 million years after they first appeared.

A new species of swamp eel has been discovered in India.