Betta, or Siamese fighting, fish are among "the most popular freshwater aquarium fish in the world," PetMD reports. Native to ...

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 fish are underwater divas ... Killifish are some of the most vividly colored freshwater fish, though many species have short lifespans—sometimes only a year, especially the annual types ...