How much territory do siamese fighting fish need?

Siamese fighting fish must be kept isolated because they will fight, immediately, often to the death. In an experiment, 2 fish were dropped in a lake. Would this be enough space? Were these tiny fish interested in exploring? No, they immediately started fighting.

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Another unusual detail about fighting fish

Siamese fighting fish, also known as Betta Splendens, have a special respiratory organ that allows them to breath air directly from the surface.

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