Fish can change their teeth quickly, which speeds up their evolution. Cichlids in African lakes show the fastest ...

Guppies are tiny, easy-care fish that grow up to 1.6 inches (4 centimeters) long. They like to live with other guppies and are social, active fish. Males are known to harass females, so it’s ...

Climate change is warming the oceans off the New England coast and bringing new species of fish. This could bring new opportunities for fishermen. But fishermen and regulators are falling behind.