Betta fish are mainly distributed in Southeast Asia, including countries such as Vietnam, Myanmar, China, North Korea, South Korea, and Japan.
Betta fish belong to the Perciformes family Osphronemidae and are named after the aggressiveness between male individuals. This kind of fish prefers shallow water areas with dense vegetation and slow water flow. They have an oval body shape, are laterally compressed, and the abdomen is in a wide arc shape. The body length of adult fish is generally between 3 and 10 centimeters, and the weight is between 1 and 6 grams. The body color of male individuals is usually more vivid than that of females and may vary with changes in the habitat. The caudal fin of betta fish can be fork-shaped or round. They are omnivorous fish and mainly feed on cladocerans, copepods, zooplankton, aquatic insects and their larvae.