Do Fish Blink Their Eyes? – The Fact

Have you ever wondered, Do Fish Blink Their Eyes? In fact, this is a very curious question. And it is to him that you will find interesting answers in our article.

Do Fish Blink

Are Eyelids And The Blink Reflex Really Needed?

Nature does not give anything superfluous to either man or animals. The eyelids protect the eyes from external damage, moisturize with tear fluid. They cleanse the corneas and sclera from accumulated mucus and dust, prevent injuries. Promotes focusing of vision. Regulates eye pressure. In mammals, eyelashes grow on the eyelids, there are glandular mouths.

Blinking is an unconditioned reflex, it is provided by the eye muscles, which are under the control of the subcortical nerves of the brain – the oculomotor, trigeminal and facial nerves. It has a protective function, when foreign particles get into the eye, due to blinking, tearing increases, and the speck is washed off.

This is a necessary response. The process occurs automatically, it is natural for the normal balance of the internal environment, both in humans and in animals.

What Other Protection Does Eyelids Provide?

Collagen cartilage is located under the muscles, it gives shape, provides strength to the condition of the eyelid. He participates in the closing of the eyelids, due to which mammals and birds sleep or rest, disconnected from all the surrounding information. Plus, the sebaceous glands located in the skin produce a fatty secretion, regulate the outflow of tears, so the eye apparatus is always protected. Eyelashes on the eyelids are a barrier, they scatter light, allow you to see the world around you more clearly, increase visual acuity. The main functions of the eyelids and eyelashes are to protect the eye apparatus from the unfavorable conditions of our environment, the ingress of sweat, rainwater, and snow.

Read Also: When Do Aquarium Fish Sleep?

Do Fish Blink And Have Eyelids?

The structure of the brain and nervous system of fish is different from that of mammals. Therefore, they do not have eyelids, do not blink, but they can move their eyes. Constantly open, they do not interfere, do not overload the nervous system. These creatures live in water, it perfectly replaces the eyelids, naturally moisturizes, flushes out various particles. Many species live mostly on the bottom, where sand, silt and debris predominate. Water does not allow damage to the visual apparatus of deep-sea fish. The structure of the ocular membrane of the deep sea is very dense, which protects them from external damage. One-eyed fish can be seen in nature, but this is very rare.

In nature, there is a fish – a muddy jumper. Although it can be on land for a long time, it also has no eyelids. The structure of the eyes in such a fish is more complex, which is associated with long-term evolution, the development of other protective barriers.

Of the fish, only sharks have eyelids, they by their nature cannot use them like humans. They do not close, but do not cover completely, preventing the eyes from damage.

There are shark species that have a flashing membrane. If the shark senses a danger, it lowers the film over the eyes, in the absence of danger, raises the membrane. Sharks also have to protect themselves. The self-preservation reflex is triggered.

Many beautiful ornamental and commercial fish species are protected, but constant discharges of toxic substances into the world ocean can lead to a real ecological catastrophe, unusual mutations. No amount of defensive reflexes will help the marine inhabitants survive. Scientists from different countries are working on this problem to preserve the inhabitants of the water element for the future!


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