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Siamese fighting fish
Siamese fighting fish, better known as betta fish, are one of the most popular home aquarium fish out there. They are native to freshwaters in Southeast Asia, and were originally bred for fighting (like dogfights but with fish). Betta are extremely hardy fish, and can survive low oxygen levels and bad water quality thanks to an almost lung like organ that lets them breathe air if they have to.
fact source: wikipedia
image source: fishkeeping wisdom

















