The Siamese Fighting Fish is an aggressive, colorful fish that is native to Thailand, Vietnam, and Cambodia by way of the Mekong Delta. Siamese fighting fish are small fish that can have several possible colors. While dark blue and dark red are common colors, they may also be grey, black, red, orange, yellow, gold, blue, white, violet, or even multicolored. Sadly, habitat destruction, pollution, cold temperatures, and predators have decreased its population in the wild.