A search for a fish lost to extinction led to a brand-new species hiding in a South African river.

Scientists used AI to analyze 10,631 freshwater fish species and found that stable, connected rivers are critical for ...

Tuna, opah, and billfishes such as marlins and swordfish are among the 0.1% of fish species that are warm-blooded. Evidence by an international team of researchers led by UC San Diego’s Scripps ...

Ancient fish, known as living fossils, have survived for millions of years. Species like Coelacanth, Sturgeon, Lungfish, Lamprey, Hagfish, Gar, and Paddlefish offer a glimpse into prehistoric life.