Koi have six types of color cells in their skin ... Koi are actually a type of carp, and today they're some of the most expensive pet fish in the world. But why? Koi were originally raised ...

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 ...

This week, we’ll learn about one of Hong Kong’s most beloved pets – our city even has a market named after a species of fish. Find out how these commonly misunderstood creatures let us know ...

Scientists found a “large”-mouthed river creature, sometimes kept as aquarium pet ... Lufubu River fish turned out to be subtly but consistently distinct from other known species.