Unique anatomical structures, proteins, and cell membranes allows them to withstand crushing pressure and darkness. In the Mariana Trench—7,000 meters below the ocean’s surface—these fish makes a living in total darkness and at crushing pressures that can reach 1,000 times more than at sea level.

The animals have a developed ways to cope with the deep ocean’s intense water pressure. This force, which is the result of the weight of a column of water pushing down, is so strong in the bathypelagic zone that it would crush anything with air in it. that helps them stabilize their bodies at different water depths.

Thus they are capable of surviving in that crushing pressure. These organisms also possess large lungs, air sacs which helps in maintaining their internal pressure of the body so as to overcome the external pressure this way the equilibrium is maintained and survival also maintained.

how do the marine invertebrates and fishes live at great depth in oceans where the pressure could be >100 times the normal atmospheric pressure and do they have any special enzymes? Without the bladders, deep-sea fishes don’t have gas spaces in them that would cause them to get crushed.

Fish living closer to the surface of the ocean may have a swim bladder – that’s a large organ with air in it, which helps them float up or sink down in the water. Deep sea fish don’t have these air sacs in their bodies, which means they don’t get crushed.

The lanternfish is, by far, the most common deep-sea fish. Other deep sea fishes include the flashlight fish, cookiecutter shark, bristlemouths, anglerfish, viperfish, and some species of eelpout. Only about 2% of known marine species inhabit the pelagic environment.

Rare Species in Deep Sea Exploration

• Megamouth Shark. Discovered in 1976, the megamouth shark (Megachasma pelagios) is one of the rarest fish in the world.
• Vampire Squid. Vampire squid (Vampyroteuthis infernalis) are cephalopods that inhabit oceanic depths between 2,000 and 4,000 feet.
• Frilled Shark.
• Fangtooth Fish.

Anglerfish

Just when you thought puppy-sized spiders were the creepiest creatures on the planet, we found a few more to give you nightmares.

• 1. Aye Aye Lemus. Image.
• Dolomedes triton, the fish eating spider.
• Amblypygi.
• Sarcastic Fringehead.
• Wolftrap Anglerfish.
• Santino the chimp.
• Atretochoana eiselti.