Betta fish

The Siamese fighting fish (Betta splendens), also known as the betta, is a freshwater fish in the gourami family, native to Thailand—previously known as Siam—and present in neighboring Cambodia, Laos, Malaysia, and Vietnam. While colloquially known and marketed as "betta" in the global aquarium trade, B. Splendens is one of 73 species comprising the genus Betta. It is one of the most popular and widely available aquarium fish in the world, due to its varied and vibrant colour, diverse morphology, and relatively low maintenance. Mostly concentrated in Thailand's Chao Phraya river basin, bettas were discovered in the still waters of canals, rice paddies and floodplains, where they are still found; they have been kept and bred since at least the mid-19th century, and possibly much earlier. Their characteristic vibrant colour, large and flowy fins, and aggressive behaviour are the result of intensive artificial selection, earning them the moniker of "designer fish of the aquatic world".

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