No.40 Sea robin

A saltwater fish belonging to the sea bass family, Hoboidae, and found on sandy and muddy bottoms from Hokkaido to Kyushu. It is said to be able to open its nightshade-colored pectoral fins in order to mock or startle the eyes of its enemies.
The soft stripes on their pectoral fins act like legs, allowing them to walk and find prey in the sand.

This sample was obtained at the request of NHK Enterprises, Inc. through a CT scan as part of NHK E-television's “Giggling Sakana★Star” program.
Gyogyotto Sakana★Star" program HP: https://www.nhk.jp/p/ts/P58QMGP4K1/

CT scans have shown that the head and back are covered with bony plates (hard plate-like bones), which seem to protect them from sharks and other natural enemies.
When a sea robin senses danger, it makes a sound using its floating bag and surrounding muscles to startle its enemies. This sound is said to be the origin of their name.