Here, we introduce you to the world’s most expensive fish ... but they are properly one of the most expensive fish you will ...

Curious about the most exotic and expensive fish in the world? Let us fill you in. Let's talk about the totoaba fish, which ...

Narrator: That's Emily Voigt, who explores this world for her book ... More from News As far as fish go, the Asian arowana is one of the most expensive aquarium species sold in the pet trade.

There's only one type of tuna in the world that grows that ... Narrator: This is the most expensive. And depending on where it's from, and where the fish was raised, the price can vary anywhere ...

The following is a transcript of the video: Herrine: This is a scorpion fish. It's one of the most venomous fish in the world ... is that on the more expensive scale or cheaper scale?

Koi are actually a type of carp, and today they're some of the most expensive pet fish in the world. But why? Koi were originally raised in Japan in the 1700s when rice farmers first began ...