The reason why deep-sea fish are not afraid of water pressure is that in the long process of evolution, their body structure has changed, and they can adapt to the cold and dark environment. The fluid inside the cells is equivalent to the pressure outside the body, so the difference between the internal and external pressure is not large, so they will not be squashed by the strong water pressure. This also makes it impossible for them to float up to the shallow sea area, otherwise their own pressure will break them.
1, monkfish: monkfish's alias has many, for example toad fish, anglerfish and so on, it's many kinds, lives in the sea surface 2-500 meters below the area. Its head has a fleshy bulge, shaped like a small lantern, which can emit light. It is used to attract some phototactic fish and prey on them.
2, Blobfish: Blobfish lives in Australia and Tasmania along the coast below, the deepest up to about 1200 meters, this fish body is gelatinous, body length of about 30 centimeters. It has no swim bladder, because the swim bladder can not work in the environment, and can only dive and surface through a special body.
3. Pipe eye fish: The special feature of the pipe eye fish is that it has a transparent head and tubular eyes. The fish lives 2,000 feet deep, and because there is no sunlight at this depth, its eyes have special structures that allow it to collect all the light around it.
