Deep Sea Fishes

The world of seas goes beyond our imaginations. However, life finds a way there as well. In this article, we will let you know about Deep Sea Fishes.

The life that exists underwater is far deeper than we think. Yet, it is unsurprising that fish and other animals still exist out there.

Let us dive into the deep-sea world to look at the creatures that live there life, far away from the sunlight.

What are the Deep-sea Fishes

Sunlight can go only to a distance underwater. Nonetheless, fishes still live in the dark, below the sunlit surface of the water. “Deep-sea fishes” is what we call them.

Where are the Deep-sea Fishes

You can find fishes way below the surface, even below the photic or epipelagic regions of the sea that is up to 200 meters.

To find these fishes, you would have to go below 600 meters. The depth can go much lower, till 8,370 meters. However, that does not limit the species as we are yet to explore a vast majority of seas and oceans.

The environment of the Deep-sea Fishes

In the deep waters, there isn’t much oxygen, sunlight, and food to support life. However, fishes have adapted themselves to the environment of the deep sea.

In the upper regions where the sunlight falls, life goes on without any hassle. The organic debris, or waste, falls from the upper regions to the lower regions to sustain the life of deep-sea fishes.

Moreover, the water pressure increases as you keep going deep. The deep-sea fishes have adapted to maintain their pressure by adjusting their molecular levels.

At such a point, the other fishes fail to survive. Ironically, Those types of fishes die when they get above due to the gas-filled vacuoles inside them blowing up.

Characteristics of the Deep-sea Fishes

Well, by now you’ve understood that these fishes live the best below the surface. It is due to the evolution that they have adapted to their environment.

In the region, there is no light, and most of the fishes are blind. However, they have trained their other senses to sense their food, find their partners, and their way. Also, some fishes aren’t blind. They create their light, the bioluminescence, which is 100 times more than we can sense.

Although most of them give birth in the dark regions, some fishes fall below after their birth or on maturity. There is no primary source of food. So, the fishes have to feed on the matter that falls from the above regions.

Types of Deep-sea Fishes

We can divide these fishes based on the zones in which they live. Here are the types of those fishes:

  • Mesopelagic Fish

This zone exists between 200 and 1,000 meters. The light in this region gradually fades away till it is completely dark in the end. Here, you can find

  • The Stoplight Loosejaw

This fish has a long lower jaw with no floor. The stoplight loosejaw has fang-like teeth along with tiny sharp ones. For preying, they use red bioluminescence to their advantage as most fishes are blind to it.

  • The Daggertooth

With their dagger-like teeth, they paralyze other fish to feed on them.

  • Long-snouted Lancetfish

At 2 meters, they are the largest.

Bathypelagic Fish

It is the region below, and it is pitch dark. Here you can find:

  • Anglerfish

The head acts as an angler to attract other fishes.

  • Bristlemouth

Bristlemouth has bristle-like teeth.

  • Fangtooth

It’s in the name, they have fang-like teeth.

And many others

Fact: The most abundant fish on earth is the bristlemouth.


1. Why do deep-sea fishes die when brought to the surface?

These fishes have adjusted their internal pressure according to their environment. When they are brought up, they cannot cope with the change on the surface.

2. Why do deep-sea fish look so different than the normal fish?

The quantity and quality of nutrition decrease with depth. So, they look different, or ugly if you will, as compared to the normal fishes.