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 ...

They found that the fish, Danionella cerebrum, drums out a powerful rhythm on an organ called a swim bladder. In the waters close to the fish, it taps out 140 decibels, which is as loud as a gunshot.