How do fish find food in deep water without light?

Through the nose's sense of smell, or evolve your own set of induction systems to sense.

Some fish rely on a keen sense of smell. Some fish rely on sound waves that come back back. Some fish emit light on their own and use them to find food.

It relies on other sensory organs to prey, and the common ones are tentacles.

When there is light, fish have to use other sensory organs to find food.

Prey is discovered through other sensory organs.

That's because they have other sensory organs.

The inner ear of a fish can not only clearly distinguish the high and low frequencies of sound waves transmitted in the water, but also recognize the direction, distance and source of the sound source through the brain in time.

Its nasal cavity is densely packed with olfactory nerves, with an area of up to 4,842 square centimeters, such as a 5-7 meter long man-eating shark, whose sensitive sense of smell can smell the blood of injured people and marine animals thousands of meters away.

There is no light in the deep sea, so how do fish find food?

In addition to being able to emit light on their own, deep-sea fish have a very sensitive sense of smell and touch, the main food in the deep sea is the carcass of food in the upper ocean, which is one of the main deep-sea plants.

The second is their sense of hearing, which is much more efficient in the deep sea than in the air, and any animal in the water can feel the waves if they want to move. Good hearing not only helps them maintain their balance, but also helps them feel the fluctuating effects of sounds and water waves from different organisms. Relying on these, coupled with your body's sensitive sense of touch, you can feel whether there is prey around you according to the change in water pressure.

So in the deep sea, animals don't necessarily rely on light to determine the location of their prey, but can also capture them through their senses of smell, hearing and touch.

The physiological structure of fish is different from that of humans, and their special physique can be seen.

I think that even creatures that are able to adapt to that environment without light have their own unique ways of obtaining food. For example, they can feel the fluctuations of the current to find prey. It can also be swallowed directly into the seawater to prey on plankton or zooplankton in the water.

Most of the fish in the deep sea rely on their sense of smell to find food, and their vision is only an aid, and they need to eat less food.

The first is the ability of deep-sea fish to resist pressure, and the physiology of deep-sea fish has changed greatly in order to adapt to the environment. These changes are reflected in the muscles and bones of deep-sea fish. Due to the tremendous water pressure of the deep-sea environment, the bones of the fish become very thin; And it's easy to bend; The muscle tissue becomes particularly flexible and the fibrous tissue becomes surprisingly fine.

What's even more interesting is that the skin tissue of the fish becomes just a very thin membrane, which fills the physiological tissues of the fish with water and maintains the balance of pressure inside and outside the body. This is why deep-sea fish are not squashed under such enormous pressure conditions.

Secondly, in order to adapt to the dark environment of the deep sea, fish living in the depths of the ocean need to identify their kind, find mates and forage for food in extremely dim light, which requires them to have the ability to shine. Different fish emit different lights; With these lights, the same fish can transmit messages to each other and lure other fish to become victims, or to get rid of predators. Therefore, luminescence is one of the important means for deep-sea fish to survive.

In addition, the eyes of deep-sea fish have become very peculiar. The eyes of ordinary fish mostly grow on the sides of the head, but the eyes of the back fish that live in the deep sea grow on the back of the head. From the front, the two large eye frames of the back fish look like two light bulbs erected.

And from above, the two eyes resemble two large circles, occupying the "fortress" part of the head. What's even more interesting is that this fisheye can move up and down, left and right, and its eyeball structure is similar to that of a telescope, and it can adjust the focus freely. The peculiar eye structure is almost a common physiological feature of deep-sea fish.

Survival of deep-sea fish.

In the depths of the sea, not only is there no light, the water is also cold, and food is scarce, but there are still many fish living there, what do they live on? It turns out that fish in the deep sea are usually very small and can survive with a little food. Some even eat once for months.

Deep-sea fish are all strange in shape, for example, there is a kind of called"Underwater fisherman"of deep-sea fish, with one on the top of its forehead"Fishing rods", hanging a glowing one"Bait"Other fish swam over to eat, but were swallowed"Underwater fisherman"went in the stomach.

Some deep-sea fish have their own luminous bodies, while others live by means of sound and vibration.

Only humans are phototaxis, cats and dogs can see things without light, and fish are a truth.