This 17 January 2020 video says about itself:
The fangtooth, or ogrefish, has extra-long, sharp teeth and a face only a mother could love. This fierce-looking fish actually gets no bigger than the average adult human hand. The fangtooth is found in meso- and bathy-pelagic waters worldwide. Dark skin and scales provide camouflage in these dim ocean depths, assisting them with catching prey (fish, shrimp, and squid) and avoiding hungry predators (tuna and marlin). Their prominent lateral line system detects water movement and compensates for poor eyesight and low light conditions. The fangtooth has been spotted just eight times in the past 30 years of MBARI ROV expeditions.