Betta fish, also known as Siamese fighting fish, are popular freshwater aquarium fish known for their vibrant colors and flowing fins. They are native to the shallow waters of Southeast Asia, particularly in countries like Thailand and Cambodia. Betta fish are known for their territorial behavior, especially males, which can lead to aggressive interactions if kept together. These fish thrive in warm water and prefer a temperature range of 75 to 80 degrees Fahrenheit. Betta fish are also known for their ability to breathe air through a specialized organ called the labyrinth organ, allowing them to survive in low-oxygen environments.