The luminous organs can be present on several parts of the body of the deep ocean fish and they are often used to prey, communicate or be safe from predators and even for mating. More than a dozen families of marine fishes are mid-water species and they are distinguishable due to their enlarged eyes, enormous mouths, and the presence of luminous organs.
There are many deep sea fish representative species that lie like the deep saltwater fish under the vastness of the sea level and each has some special features depending on their class or family. The mesopelagic fish and use colour to camouflage themselves from other fish. The fish also tends to develop spines as a defence mechanism except for the mesopelagic fish that usually lack defensive spines. Upon maturation, they no longer float in the buoyancy state and the weight increase makes it denser than the seawater and helps them develop hydrofoils in order to provide hydrodynamic lift, unlike other fishes which at this stage develop swimmer’s bladders. Many of them are born in the shallow waters and as they mature they sink into the depths of the sea. The eggs or larvae of the fish have oil in the plasma as they stay in a buoyancy environment in the pelagic zone at this stage. The fishes that live under the deep ends have special features for different conditions than the sea level. The depth when 200 metres and below the pressure increases and the fishes surviving in such depths of darkness are called deep sea fish. The deep sea fish thrive in areas under the ocean where even sunlight fails to reach due to its depth, which is bound to make marine biologists curious about this species.
They survive in deep waters and dark surroundings under all the pressure from the water above. The aquatic bodies of the planet earth are home to so many fishes among them the deep sea fish or the deep ocean fish which are of the class Osteichthyes and they are the most intriguing and researched aquatic creatures.
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