Species numbers alone do not fully capture how ecosystems are changing. In a global study, scientists analyzed long-term data ...

Researchers identified a new freshwater fish species in South Africa after years of genetic testing and analysis.

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 ...

Fish species respond to temperature increases by going after more readily available prey. Models suggest this behavior could lead to more extinctions. Fish are changing how they search for and consume ...

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