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.
An curved arrow pointing right. Fish maw — the swim bladder of a fish — is one of the most expensive dried-seafood products in the world. A Chinese delicacy, it can fetch $450 to $1,000 per ...