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Deep-Sea Creatures

January 23, 2022

Deep-Sea Creatures

Deep-sea is the zone where there is no light reaching and complete darkness. Some creatures are adapted to live in zones below the photic zone. Deep-sea fishes inhabit the deeper areas of the sea, as deep as 8,370 m

Some Common Characters of Deep-Sea Creatures:

There are some standard features that almost all deep-sea creatures have that are,

  • Deep-sea fishes are mostly red in color but appear black because red light doesn't reach the lower area of the sea, and there is no light to reflect.
  • Deep-sea creatures emit blue light, and this ability of emitting light is called bioluminescence.
  • Deep-sea fishes are primarily blind, and the others have large sensitive eyes that use bioluminescence light.

Deep-sea creature are distributed in different deeper zones and has different characteristics but have some common adaptations, and these are,

Adaptations of Deep-Sea Fishes:

Deep-sea fishes show evolutionary adaptations to cold, extreme pressure, low oxygen levels, predators, and darkness.

  • They have swim bladders
  • Lower their heart rates
  • Have compressible lungs
  • They reduce their movement
  • They inhabit Nitrogen absorption
  • They have TMAO (Trimethylamine Oxide)
  • Have the ability to hold breath for hours.

Some Deep-Sea Creatures:

The article is about some amazing deep sea creatures, such as

  • Stoplight loosejaw
  • Elusive glass octopus
  • Viperfish
  • Footballfish
  • Blood-red jellyfish
  • Black seadevil
  • Coelacanth
  • Grenadier
  • Bigfin squid
  • Barreleye fish 

Stoplight loosejaw:

Malacosteus niger, stoplight loosejaw present at a depth of about 1km and emit the light from its jaw, not only blue but red light as well. The stoplight is called a man-gobbler.

The emitted light is used to search their prey and for communication with other fishes. This deep-sea fish has needle-shaped teeth, and the mouth can be open large as it is hinged with the neck.

Elusive glass octopus:

Vitreledonella richardi is found by the sea on Phoenix Island.

Glass octopus is transparent, while it has an opaque digestive tract, cylindrical eyes, and optic nerve. They may grow up to 1.5 feet and present at a depth of 3,000 feet.


Chauliodus species, viperfish, is an aggressive predator with large fangs and is present at a depth of 400m to 1km. The fish produce red bioluminescence.

The viperfish can stick its lower jaw and bend its head back to grab its prey tightly. It mainly eats crustaceans, other fishes, squid, etc.


Himantolophus groenlandicus, this fish present at the range of 20m to 1km depth. The fish's name is due to its football size, and the whole body is covered with spines. The spines have little branches; the tips of these branches of spines are tiny glowing lights.

The fish has sharp teeth used to catch their prey which is attracted by light from their spines.

Blood-red jellyfish:

Cyanea capillata blood-red jellyfish belong from the genus Borrelia, and this jellyfish is also called the lion's mane jellyfish. Blood-red jellyfish have a bell shape with large 30 tentacles.

Blood-red jellyfish are present at the depths of 800 to 13,000 feet.

Black seadevil:

Melanocetus johnsonii is present at the depths of about 2km and has such large stomachs to eat the prey even larger than their size. 

Male and females have different body organs as females have stalk between their eyes, big sharp teeth, and light organs while males are smaller and attach to females as parasites and depend upon females for feeding. Males have many nostrils, which help them locate their females in the dark.


Latimeria chalumnae is present at a depth of 400m and is known as a living fossil as it is the linking deep-sea creature between fishes and amphibians. It has leg-like lobed fins. They have an unpleasant taste which makes them not so famous.


Grenadier is also known as Rattail and is present on the seabed at a depth of about 2.2km. They may grow up to 1 meter in length and are highly sensitive to slight vibrations in the water, so they are active predators.

Bigfin squid:

Bigfin squid of genus Magnapinna is also called an alien-like spindly squid. The bigfin squid has iridescent fins and elbow-like tentacles

Barreleye fish:

Macropinna microstoma has a see-through skull, bulbous green eyes, nerve endings that can also be seen from its translucent head. The fish is also known as spook fish. The fish is detected at a depth of 650 m.

To know more about deep sea fishing, our article Adventurous Deep Sea Fishing might be helpful.

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