Do carps have nostrils and why? What is the use of the nostrils of a fish

For the vast majority of fish, the olfactory organ is a blind sac with chemoreceptor cells on the inside, and the nostrils are the openings of the olfactory receptors. In general, fish nostrils also have a valve that divides the nostril into two parts, making the blind sac a tube to enhance the flow of water through the olfactory receptors, so it looks like there are two nostrils on one side, and the two nostrils are called anterior and posterior nostrils respectively. It is important to note that these nostrils do not have the effect of aiding breathing.

But there is another type of fish that has the inside of the nostril that connects with the mouth, and this opening is called the internal nostril. Flesh-finned fishes in fish, including speartail and lungfish, have internal nostrils. The internal nostrils are an evolutionary trait that opens up the passage between the nostrils and the larynx, allowing the larynx and lungs to receive air through the nostrils, thus replacing the gills as the primary respiratory system.

Having an internal nostril is a common pattern in the respiratory system of tetrapods after fish. The respiratory system of fish is different from that of all other organisms. People breathe through their noses, while fish breathe through their gills.

The gills allow them to use oxygen from the water. Water is constantly entering through their mouths, passing through their gills and then exiting their bodies. The gills have very tiny veins that draw oxygen from the water and expel carbon dioxide from the body.

Most fish have nostrils, but this is never used for breathing purposes. There are tiny sacs inside the nostrils that fish use to sniff the smell of nearby currents. For example, sharks use their sense of smell to find the location of their prey.

Most of the fish heads have two nostrils on each side, and there are olfactory cells, and the nostrils of the fish have nothing to do with breathing, only the sense of smell. Water is sucked in through the front nostrils and expelled through the back nostrils, so that the fish can smell the water. However, it only provides the sense of smell and does not have the ability to breathe, and the nostrils of bony fish do not communicate with the mouth.

So it has nothing to do with breathing! Fish respiration is the use of the mouth after inhaling water. It is then discharged by the gills (using the cells on the gills to extract oxygen!)

The olfactory sac in the nostrils of fish senses the smell of food. The smell is different from that of other fish. Avoid predators!

The whisker is the tactile organ of fish, and it has an important tactile function. <>

The olfactory organ of the fish is a blind sac with olfactory receptors in it, the nostrils are the openings of the olfactory receptors, and there is also a valve on the nostrils that divides the nostrils into two parts, making the blind sac tubular shape. Due to the anterior and posterior difference in position, the two nostrils of the fish are called anterior and posterior nostrils, respectively. The anterior nostrils are the inlet of the water flow, while the posterior nostrils are the outlet of the water flow.

When the water passes through, some of the scents are also picked up by the olfactory receptors, and the fish can use these scents to decide whether they want to leave the water or whether they are in danger. The nostrils of bony fish do not communicate with the mouth. Therefore, it has nothing to do with respiration, which is respiration after inhaling water through the mouth.

It is then discharged by the gills (using the cells on the gills to extract oxygen!) The olfactory sac in the nostrils of fish senses the smell of food. The smell is different from that of other fish.

Avoid predators! <>

Most fish have nostrils, but they don't use them for breathing. There are tiny sacs inside the nostrils that fish use to sniff the smell of nearby currents. For example, sharks use their sense of smell to find the location of their prey.

Water is sucked in through the front nostrils and discharged through the back nostrils, so that the fish can smell the water.

The whisker is the tactile organ of fish, and it has an important tactile function. Bearded fish, mostly demersal fish with poor eyesight, rely on their tentacles to find and choose food underwater. The whiskers also help them sense the weak electrical current emitted by their prey and capture it.

For example, when the sturgeon feeds, it first uses its snout to dig up the mud, and the water becomes turbid, at which point its small eyes are no longer functional, and it has to rely on the tactile sense of its whiskers to feed. <>

Nostril function of fish:

1. Provide a sense of smell: The olfactory organ of the fish is a blind sac with olfactory receptors inside, the nostrils are the openings of the olfactory receptors, and there is a valve on the nostrils to divide the nostrils into two parts, making the blind sac a tubular aura;

2. Not used for breathing: the nostrils of bony fish do not communicate with the mouth, so they have nothing to do with breathing. Fish respiration is inhaled into water by mouth beams, and then excreted by gills;

3. Use the sense of smell to avoid predators: The olfactory pouch in the nostrils of fish can sense the smell of food and the different smells of other fish that are delayed to avoid being infested by predators.

Fish have snouts, which grow on the left and right sides in front of the head and are used to act as olfactory organs. Their snouts are used to find food, identify water quality, find mates, and be alert to predators, although some fish have evolved stools to communicate their nostrils with their mouths and act as respiratory organs.

Fish not only have a nose, but also have two noses, with a total of four nostrils. The nose of a fish grows on the left and right sides in front of its head, but its nose is not used for breathing, but as an olfactory organ.

When searching for food, identifying water quality, finding mates, and being alert to predators, fish often rely on their noses to develop their sense of smell. Therefore, the nose is crucial for fish.

Although the vast majority of fish nostrils do not communicate with the mouth and are only used for the sense of smell, some fish may have evolved so that their nostrils are connected to the mouth and become respiratory organs.

It is said that this carp lived at the entrance of the Yellow River in the past, and because it was difficult to breathe in the muddy water, it evolved into four nostrils in order to adapt to the environment. Later, the Yellow River was diverted, and this species became a rare and famous fish.

The four-nostril carp was favored by the emperor because of its peculiar birth and delicious taste. Legend has it that when Emperor Qianlong went down to the south of the Yangtze River, he took a dragon boat to play on Weishan Lake, and suddenly saw several golden carp jumping out of the water in the lake. It is surprising that this fish has four nostrils.

The fish is cooked and eaten, and the taste is extremely delicious, so Long Yan Dayue: "The four-nostril carp is very delicious!" "Then he ordered the local ** to take the four-nostril carp as a tribute, and pay tribute to the imperial court every year.

Answer: *** I like to eat it very much.

This is a natural evolution, first of all, the carp is a freshwater fish, the living environment is different from the sea fish, different from the sea, the freshwater is rivers, lakes and streams, and the water area is limited. There is a saying that the nostrils evolved to be used for smelling, and are sensory organs rather than respiratory organs, just like a water purifier is connected to a water pipe, not just for breathing, which is why carp evolved nostrils.