Keeping freshwater and saltwater fish in an aquarium environment isn’t always straightforward. They are sensitive creatures ...

yet they’re home to almost a quarter of all vertebrate species – including over half of all the world’s fish species. It’s an extraordinary fact: 51% of all known species of fish live in freshwater - ...

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 ...

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.