There are about 228,000 known species that live in the ocean, and experts estimate there are another 2 million that remain a ...

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.

As far as fish go, the Asian arowana is one of the most expensive aquarium species sold in the pet trade. It is a freshwater fish that has people paying in the tens of thousands of dollars for the ...