These are the prettiest freshwater fish, from vibrant brook trout and pumpkinseed sunfish to majestic lake sturgeon. Check ...

Few freshwater fish can match the size of the Mekong giant catfish, which can exceed 10 feet and weigh over 660 pounds. Native to the Mekong River, this gentle giant feeds on plankton rather than ...

2 min read Freshwater ecosystems are essential for human survival, providing the majority of people's drinking water. The ecosystems are home to more than 40 percent of the world's fish species.

This story appears in the April 2017 issue of National Geographic magazine. Hundreds of millions of people worldwide would lack their prime source of protein without freshwater fish. Yet the lakes ...

Of the 23,496 freshwater animal species on the International Union for Conservation of Nature (IUCN) Red List – including fish, crabs, crayfish and even dragonflies – 4,294 were found to be at ...