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 ...

Reviewed by Nick Saint-Erne Reviewed by Nick Saint-Erne Determining the gender of a betta fish is actually quite ... have males sporting short caudal (tail) fins, in most varieties, the females ...

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.