Can fish see air
Nobody can see air because its composition isn't dense enough, you'll however see it when a tornado occurs because it gathers up everything from the encompassing thus adding denser things to its composition. Now to think whether Fish can see air. First question, are humans able to see water ? Of course No !
Many picturesque pictures of water bodies have always been seen from a distance, which are blue, although the water is transparent and has no colors, but the appearance of the blue color of the water has a scientific explanation related to the light falling on the waterThis phenomenon occurs when the light reaches the water that absorbs the colors that make up the sunlight, which are the colors of the spectrum, but the wavelengths of the colors that make up the light differ from one color to another so that each color has its own wavelength, so the water absorbs all the wavelengths of the color except The blue color that the water reflects, which is the color that appears when you look at it, and the ability of water to reflect and disperse light increases when the particles suspended in the water from sediments and others increase. It is also possible that some surfaces appear green due to the presence of many algae that absorb the blue color and others Of colors and inverting green only to add that color to the water surface in it.
Can Fish see air or not?
Fish also do not have the ability to see air, but they can learn that there is a different world at the top, and maybe in the future they will conclude that bubbles are made of air, even that. Now neither humans nor Fish can really see the air.
Vision in Fishes
Seeing in water differs from seeing in air because water is less transparent than air, and as the depth of the water increases, its transparency gradually decreases until it becomes opaque, so the human eye can see in the light kilometers away, but the eyes of fish cannot see more than 15 meters. This is if the water is clear and the visible objects are at the same level.
With this remarkable ability to see in the water, the eyes of fish do not increase their composition compared to the eyes of other vertebrates, including mammals, reptiles and birds. But the Creator, with his wisdom and great ability, created it so that she could see in the water: he did not make the crystal of its eye like a lentil like a human, but rather made it in the shape of a ball, and did not place it behind the pupil as it is for humans, rather he made it enter the pupil and protrude through it above the surface of the head, and that Methods of visual scientists attest to their good fit for clear vision in the water and to make the whole eye prominent on the surface of the head like a ring lobe so that the fish can probe a wider field of vision because it is not the neck.
And what distinguishes the fish eye is that the adaptation of eyesight to distances ( called focus ) is done by moving the crystal away from the retina, while in the rest of the eyes there is an increase or decrease in the curvature of the crystal, and if we contemplate the secret of this feature, we will take the wonder in every direction.
Maintaining the spherical shape of the crystal is necessary for clear vision in the water, whether the eye is looking at something near or far, and if the crystal changes its convexity as is done in the eyes of other animals, it will lose its spherical shape and the vision in the water will be distorted. Therefore, the Creator made the fish’s eye crystal tight. Muscles control their movement so that their focus increases or decreases the distance between the crystal and the retina, without changing the spherical shape of the crystal, so bless God, who made everything well.
What draws attention is that the eyes of fish are idle from the eyelids, and that is only a matter of good management, because when the Creator inhabited them, they were rich in the process of moisturizing the eye, so that the eyes remained open even when they were asleep.
Can Fish see water ?
A Fish cannot see water, because it's constantly exposed to the present environment since a larva. These little guys can neither taste, hear, or smell the water due to an equivalent reason.
Can Fish see colors in the dark ?
As we said earlier, fish cannot see the water and also cannot see the air, however :
Scientists have discovered that fish that live in the depths of the dark oceans are able to distinguish between colors in their own way, and they said that fish that never see the sun's rays can see the world in shades of blue and green that humans cannot imagine.
A belief prevailed among scientists before this discovery that color vision is not necessary in the depths of the sea, as sunlight is unable to reach these depths, and therefore no light helps fish to see any color. But according to a study published last year in the scientific journal Science, researchers analyzed the genes of about 101 different fish, and discovered that one of them, the silver "Spinfen" fish, has genes that help it distinguish faded light more than any other vertebrates on the back of our planet. These genes help the fish see daylight, and other fish may have this ability to detect color in the depths of the sea as well.
And some deep-sea fish seem to see their world in a very different way. The team of researchers discovered that there are 3 different strains of fish living in the deep sea that have additional copies of the genes that enable them to see in dim light. Among these fish is the silver Spinfin, which has many genes and is more sensitive to blue than any of the known vertebrates.
How do fish drink water ?
"Do fish drink water?" ... a question that may have come on the minds of many of us, so how do fish drink salt water and be watered while we cannot ?
The truth is that the fish drinks from water, but does not drink from its mouth, but through the gills. It extracts oxygen from the water and excretes carbon dioxide in it, and it controls the exchange of water and gases, a feature called "osmotic pressure", as mentioned by ngarabiya magazine.
This property achieves a balance between the concentration of dissolved salts in the water present inside the cells of the body and the water surrounding it, and this makes the fish suffer from the problem of overcoming the salt water, as the concentration of dissolved salt water in the gills is higher than the fresh water, which leads to the destruction of the cells, but Here comes the ability of fish to get rid of salt water through urine and there is little left.
The secret here lies in the intake of water through the gills and not the mouth, as it controls the entry and exit of mineral salts, so that the fresh does not mix with the salty, as cartilaginous fish are like sharks whose cells contain a high salt concentration, which makes their concentration similar in sea water so that there is no interference between fresh and salty .
We find the concentration of salts in the cells of bone fish is less than its concentration in sea water, which exposes them to the entry of sea salts into their cells or the exit of water from them while they always take water from the mouth, but the excess salty water is disposed of through the kidneys.
How do Fish sleep ?
It is difficult to apply the usual standards when studying the sleep behavior of fish , as they do not have complex brain structures that can measure the change in their electrical activity when sleeping, and they do not have eyelids that can be closed, on the other hand there are other phenomena that indicate that the fish are sleeping , such as: inactivity for a long time Or, being in a comfortable position often in a shelter, or being less responsive to normal stimuli. Research indicates that fish experience a state of unconsciousness (Suspended animation) that is somewhat similar to sleep in humans, so their activity decreases and their metabolism decreases while they remain alert to the dangers that surround them, some fish are floating in the meantime, and some of them They may hide in mud or coral reefs. It is a mistake to think that all types of fish are able to sleep; There are types of fish that do not sleep, including the blue fish (scientific name: Pomatomus saltatrix ) and the well-known mackerel (scientific name: Scomber scombrus ), which are fish that swim in water day and night, and although their speed at night is less than usual, they remain Awake and respond to various stimuli, and some types of shark cannot sleep, but must remain in constant motion; This is to maintain the flow of water to their gills so they can breathe, And some types of fish do not sleep to prevent it from being washed away with the current. Some types of fish do not sleep in specific cases, such as: the Mozambican tilapia fish that does not sleep before reaching adulthood, and some fish do not sleep during the seasonal migration period, and some do not sleep in the stage of spawning, and there are fish that do not sleep while caring for their young.
Summary
In fact, fish cannot see the air and also cannot see water, but they see the world around them just like we humans.
