Betta splendens is a kind of fighting fish, which are produced through the cross-breeding of fighting fish from Malaysia, Thailand and Kampuchea. These cross-bred species is a very popular ornamental fish. They are not breed naturally in this country instead are bred using the standard Betta breeding techniques. Breeding and selection of commercial Betta splendens are actively pursued in this country. The new strains are actually originated from unattractive, greenish and short-finned fish that is still bred in Thailand for fighting. Hybridisation amongst different strains are commonly carried out to produce attractive new hybrids, in fact often resulting in brilliant coloured Betta splendens with different shapes of fins. Betta splendens are usually peaceful with other fish of it own size. However, the males are very aggressive with one another. To prevent fighting, they are normally kept solitary in transparent small containers.