By Blane Perun
Rate: (24 Ratings)
All the fish that live in the ocean’s photic zone are considered deep-sea fish. Fish that are called deep-sea fish include anglerfish, flashlight fish, and lanternfish, bristlemouths, and cookiecutter sharks, among others. Not much is known about deep-sea fish because the environment of the deep sea is very difficult to recreate in a laboratory setting to study these fish.
The water temperature is very, very cold and usually, there is very little oxygen in addition to the intense pressure. Fish who live in this area simply do not respond well to other environments for study purposes. Equipment to explore the deep sea costs a great deal of money so this is not an easy avenue to explore to learn more about deep-sea fish. Many of the fish that live in the deep sea simply have scientific names, rather than common names, because they are unknown to everyone but scientists.
The fish that live in the deep sea are quite unusual in appearance and very elusive. There are many fish and creatures that live in the deep sea that have never been studied. In fact, many of the deep-sea fish live in depths where there is no light. This means they must catch their prey, mates, and avoid danger by relying on other means.
The deep sea is completely dark, so fish here must adapt for everything. For example, some fish have feelers that will allow them to "see" where they are going, attract mates, and more.
Deep-sea fish are exposed to very little light so they do not get nutrients from photosynthetic light. The only way for these fish to get nutrients is from organic matter that sinks from higher up or in extreme situations hydrothermal vents. Because of this, most deep-sea fish have large mouths and are much smaller than fish that live in shallow water. Their guts are usually much larger, too. Since deep fish live deep in the ocean they have less bone structure and their skin is more like jelly. This makes them slower than fish living in shallower water.
Currently, there are five different species of deep-sea fish on the verge of extinction. These include spinytail skate, blue hake, onion-eye grenadier, roundnose grenadier and spiny eel. This is due from over fishing. Since these fish mature sexually at the same rate as people it is practically impossible to keep up.