For years, scientists felt like the fish they were watching watched them back. A new study suggests they can recognize a ...

A commercial angler off the coast of Mexico hauled in their nets and noticed an odd-colored fish tangled within. The shiny catch turned out to be a first-of-its-kind record. Elain Pérez Pérez ...

Judges and buyers pay attention to how healthy its skin looks, its size and body shape, and how gracefully the fish moves in the water. But the most important trait of all is the koi's coloring.

With sumptuous, fleshy lips and a bulbous, protruding forehead, the humphead wrasse is an unforgettable fish. This enormous, colorful coral-reef dweller is slow to reproduce, making it vulnerable to ...

The money was used to buy breeds, plastic containers and concrete tanks. The betta fish have colorful fins and are known as fighting fish due to their combative nature. (Photo: T.X) According to Hai, ...