Betta fish are underwater divas ... Males are incredibly vibrant, with tails that can be spotted, striped, or even shaped like fans. They're peaceful, easygoing, and thrive in groups.

What is a betta fish? Betta fish—also known as Siamese fighting fish—are among the oldest species of domesticated fish. Their scientific name, Betta splendens, combines two languages ...

Betta, or Siamese fighting, fish are among "the most popular freshwater aquarium fish in the world," PetMD reports. Native to southeast Asia, this species is known for its range of vibrant hues.