Anything strike you as special about this fish here? Well, it's worth 1.8 million dollars. It won grand champion at the All Japan Koi Show in 2017, and is the most expensive koi fish ever sold ...

The most expensive one, a Maruten Sanke, fetched $341,990 at a Sakai Fish Farm auction in 2015. In 2013, another spectacular Taisho Sanke (Shining Rose) fetched $213,223 at the same location.

Discus fish come from small branches of the Amazon. This pair of silver discus fish is priced over $30. The price of a white and pink dragon fish is around $50. Special dragon fish are priced at least ...