The gooey texture of cusk-eels and snailfish comes from a gelatinous watery tissue beneath their skin. Though nowhere near as abundant as snailfish in the hadal zone, the cusk-eel is likewise adapted to the extreme depths of oceanic trenches. Despite the name, cusk-eels are actually more closely related to tuna than they are to true eels. Like the snailfish, cusk-eels are also a bottom-feeding marine fish family (Ophidiidae) with gooey skin. However, the net that caught the specimen may not have been fully closed, so it’s possible it was caught at a shallower depth. A specimen was trawled up from a depth of 8370 meters (!!) in the Puerto Rico Trench in 1970. The abyssal cusk-eel, Abyssobrotula galatheae, may hold the record for deepest fish ever caught. The abyssal cusk-eel, Abyssobrotula galatheae. These features are prominent in oceanic trenches due to the subduction and volcanic activity occurring in them. As such, they are particularly attracted to hydrothermal vents and hydrocarbon-rich cold seeps. Hadal grenadiers also tend to be generalist benthic (bottom) feeders that eat a variety of crustacean and amphipod prey. In grenadiers, this organ is especially well-developed to compensate for the lack of vision. All fish have a special sensory organ called a lateral line that senses movement and vibrations in the surrounding water. Though light is absent in the hadal zone, grenadier species that live here have evolved other means of sensing their environment. As a whole, grenadiers may represent up to 15% of all deep-sea fish (fish that live below 200 m). Grenadiers, sometimes known as rattails, are a group of marine fish from the family Macrouridae that inhabit the deep-sea from 200 m to 7000 m. So without further ado, here are five organisms that actually live in the hadal zone below 6000 meters!Ī grenadier from the genus Coryphaenoides, one of the only genera of grenadiers with hadalpelagic members. They’re cool simply because they exist at such ridiculous depths! Hadal organisms may seem a bit drab in comparison, but they don’t need looks. Anglerfish, dragonfish, and chimaeras are great subjects for Halloween listicles while bioluminescent ctenophores and jellyfish look stunning on camera. Sadly, the denizens of the hadal zone get far less love in the news and social media than their abyssal (4000 m – 6000 m) and bathyal (1000 m – 4000 m) cousins. Very strange, baffling (and sometimes scary!) life, but life nonetheless!
This is the zone of the ocean named after Hades, the Greek God of the Underworld! The hadal zone is reserved for the ocean trenches and covers everything below 6000 meters deep.Īnd yet, despite the darkness, pressure, and cold, we find that ocean trenches are nevertheless teeming with life. The location of Challenger Deep in the Mariana Trench.
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