The remarkable sighting took place during a shark research expedition off the coast of Tenerife, a Spanish island in the Canary Islands. Marine biologists were studying sharks when they unexpectedly encountered the elusive anglerfish. Typically, the predator is found at depths ranging from 200 to 2,000 metres, so few people have ever seen one. Until now, the only known images of it have been taken from submarines.

The black seadevil, Melanocetus johnsonii, is a deep-sea predator and one of the most bizarre and mysterious creatures to inhabit the depths. It is most notable for its bioluminescent lure, a glowing appendage that extends upwards from its head, which is used to attract prey in the deep darkness of its usual environment. The fish’s haunting appearance includes sharp, fang-like teeth and a disproportionately large mouth, capable of swallowing prey much larger than itself.

Females of the species are significantly larger than males and can grow up to 40cm in length, while males remain much smaller, measuring around three to four centimetres. This difference in size is part of a unique reproductive strategy, where males attach themselves to the females like parasites, providing sperm in exchange for nutrients.

What brought the black seadevil to the surface remains a mystery, leaving scientists intrigued about its unusual behaviour. Some speculate that it may have been driven by a change in environmental conditions. But no one knows for sure.