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 ...

It’s an extraordinary fact: 51% of all known species of fish live in freshwater - 18,075 species. And more are being discovered all the time. But few people have any idea of the unimaginable diversity ...

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.