(Photo : Pixabay/Skitterphoto) Largest Deep Sea Fish Captured in Rare Footage at 6,000-Feet-Deep Off the Coast of Japan Japanese scientists captured the rare footage of what could be the largest deep-sea fish in the world, according to a news release from Marine-Earth Science and Technology (JAMSTEC). The sea creature called the yokozuna slickhead fish had only been caught six times and was mainly unknown to scientists.  The sighting was reported first on June 1 in a study titled “Detection of the Largest Deep-Sea-Endemic Teleost Fish at Depths of Over 2,000 m Through a Combination of eDNA Metabarcoding and Baited Camera Observations,” published in Frontiers in Marine Science.