The Largest Deep Sea Fish Is Called Greenland Shark, which has a length of 6.4 meters. Often mistaken for Great White Sharks because of their massive size, they reach up to 24 feet (7.2 meter) in length and weigh up to 3,100 lbs (1,400 kg). Greenland Sharks have a voracious appetite and will eat almost anything. Typically they eat eels, lumpfish, flounder, and other small sharks, but they will also eat carrion, the meat of dead animals. They have also been known to eat land animals. Greenland Sharks have been found with a polar bear jaw, an entire reindeer, horse bones, and a moose hide in their stomachs. Greenland Sharks are rarely observed in the wild. It wasn't until 1995 that scientists were able to capture the first pictures of a Greenland Shark swimming in its natural habitat.