These majestic-looking fish are called betta fish, also known as the Siamese fighting fish ... Betta fish are tropical fish, and their tank needs to reflect those needs. They will need a heater ...

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.