It's about the viperfish (Chauliodus sloani), also known as the demon of the depths – a fish that boasts the largest teeth in proportion to head size in the marine world. The Guinness World ...

Bioluminescence can serve as a lure to attract prey. The viperfish, Chauliodus sloani, has a luminescent lure on the end of a modified fin ray that it can arch forward in front of its mouth.