Yellow boxfish

These fish get their name from their boxlike appearance. Juveniles of this species have vivid yellow color with many black spots. Adults have yellowish-brown color and covered in black spots that in turn contain smaller white spots. When disturbed or stressed, they secrete a poisonous mucous from their skin in order to protect themselves from predators.

Scientific Name
Ostracion cubicus
Order: Tetraodontiformes, Family: Ostraciidae
South of Wakayama Prefecture, Indian Ocean, Pacific Ocean