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 ...

For betta fish, one tablespoon of aquarium salt per 5 to 7 gallons of water is a general rule of thumb, but it’s always best ...