One of the most popular choices for beginner aquarium owners are Guppies. These are small, brightly coloured fish with elegant tails. They’re also peaceful and easy to breed. Guppies thrive in tanks ...

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 ...

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 ...

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 ...

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 ...

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

Tetrahymena thermophila is a freshwater unicellular ciliated protozoan that serves as a model organism for molecular biology. It features unusual genomic and nuclear structure.