Mesh
I wasn't sure if that's a real fish or not.........no place for its own teeth to go when the mouth is closed.
I would assume that the teeth go outside of the jaw when closed. Apparently, it is a Goliath Tiger Fish and it has 32 teeth, eats crocodiles, grows to at least six feet long and can weigh over 100 lbs.
Oh yeah, and even their mothers think they look ugly.
I'll be quite happy if I go my entire life without running into one.