Lifestyle Desk: Fish are animals that live in water. There the fish can float still, can go very deep in the water, and even if they want to, they can lift their heads out of the water and float away.

fish in water

How can fish do these?

When the fish is on top of the water, the water pressure on its body is less. And if it is at the bottom, the water pressure is more. So the deeper the water, the higher the pressure. When a fish floats from a fixed position, it displaces water equal to its body weight. That's why it can float. But the body weight of the fish will not increase or decrease suddenly.

So how to get up and down on the water or how to float on a certain level of water? A fish has a balloon-like organ near the esophagus. It is known as Pataka. The middle of the cracker is like a notch and divides the cracker into two parts. There are numerous blood spots on the crackers.

Oxygen, nitrogen, carbon dioxide gas comes out from this blood vessel and accumulates in the deep tissue or shell. Again, the blood vessels and gases are absorbed from the chamber or shell behind the crack. In this way, the cracker is filled with gas when needed, and when the need is over, the gas is reduced. If the cracker is filled with gas, it will swell, if not, it will remain silent. When the fish move into deeper water, the water pressure is higher.

Then it cracks and becomes smaller under increased pressure. As a result, the weight of the removed water is much less than the body weight of the fish. Then the fish can easily sink under the water.

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When the fish rises a little higher, the cracker fills with gas and swells. Inflated crackers remove more water, resulting in weight of fish equal to the weight of water removed. In this way the fish can float to a certain level of water. Again, when the fish rises to the top of the water, the water pressure decreases. At this time, if the fish crackers are filled with gas, the fish will float on the water. That's why gas comes out of the fish crackers while rising. On the other hand, blood vessels absorb firecracker gas. As a result, the size of the cracker also becomes smaller. Then a deep water balance is created in the fish body. The fish remain stationary and float on the surface of the water.