Deep below the surface of a river in northern Brazil, a “shy” creature tucked its “armored” body into a rocky crevice. Divers ...

Both new and experienced pet fish owners often fret about finding a healthy species to introduce to their aquarium. But, how do you even measure the health of one species against the others?

In a river of northeastern Brazil, an “armored” creature with “large” eyes paused to rest against a rock. The maze-like ...

This species, with its many varieties, is the most common betta fish found in aquariums and pet stores, but it has more than 70 relatives, including the endangered Betta miniopinna and Betta ...

In fact, invasive fish species accounted for over half of the ... The Department of Fish and Wildlife thinks that a few irresponsible pet owners are to blame. And while the goldfish may have ...