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 ...

These organs, called barbels, help the fish to locate bottom-dwelling prey, such as snails, mussels, clams, crayfish, insect larvae, and fish eggs. Also known as the rock sturgeon, the lake ...