Let me reiterate; this is a FISH, not a BEET! It is a BETTA (two "t's," pronounced BET-uh) not a BETA (one "t," pronounced BAY-tuh). Beta is the genus name for beets, while Betta is this fish's genus name.
The Siamese fighting fish (Betta splendens) also known as the betta, is a popular species of freshwater aquarium fish. The name of the genus is derived from ikan bettah, taken from a local dialect of Malay.