For deep-sea fish like the fangtooth, ultra-black serves as an “evolutionary tactic that gives some fishes an invisibility cloak,” Courtney Sexton wrote for Smithsonian magazine in 2020.

Video captured by the team shows an adult Abyssal Humpback Anglerfish swimming close to the surface of the water — it’s an ultra ... why these fish are sometimes known as the “black sea ...

A rare Humpback Anglerfish, usually found 200–600m deep, was spotted near Tenerife in daylight for the first time. Experts speculate rising temperatures or its nearing death led it to the surface. The ...