Whether it's redfin pickerel in the Kennebec River or sturgeon in the Great Lakes, nearly one-third of freshwater fish ...

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

A dozen fish pulled from a South African river sparked years of debate before being confirmed as a new species.

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