The Mexican tetra lives in freshwater streams and pools from Mexico up into the southern United States. But these fish also live in cave systems in at least 29 separate places in Mexico, where they ...

The United States is the main market for “ornamental” marine fish, those that end up as pets in aquariums. Now, a new study ...

Long ago, some saltwater fish adapted to freshwater — and in doing so, developed an extraordinary sense of hearing rivaling our own. By examining a 67-million-year-old fossil, researchers from UC ...

One of the most majestic freshwater fish, Arowanas are known for their long, sleek bodies and graceful swimming style. They have dragon-like appearance, and so they are also commonly called dragon ...

Aquarium enthusiasts around the world have fallen in love with the kuhli loach, an eel-like fish native to Indonesia. If you are considering joining the ranks of kuhli-loach owners, you’ll need to ...

The search is on for the perfect new additions to the aquarium—wild freshwater eels. From spotting their hiding spots to carefully catching them by hand, this adventure is equal parts patience and ...

An artist’s reconstruction of the Weberian apparatus in a 67 million-year-old fossil fish. The Weberian structure (gold-colored bones at center) arose from a rib (shown in gray attached to several ...