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If you have ever shopped for koi fish, you would already be aware that they can cost a pretty penny. Koi fish are prized for their beauty and are a valuable addition to any pond, but it is more than their aesthetic appeal that bumps up the prices to phenomenal amounts. In the All Japan Koi Show 2017, the grand champion koi fish was sold for 1.8 million dollars, breaking the record for the most expensive koi fish ever sold.