Why do the sea lions of Baotu Spring live in fresh water?

There are many species of seals, most of which live in seawater, but there are also freshwater seals, such as the Baikal seal, the only freshwater seal in the world, which is generally considered by the scientific community to be the Baikal Sea.

Leopards are supposed to come from the Arctic Ocean, as they are closest in blood to the seals there. Fat and round seals are dexterous in the water, swimming at speeds of up to 20 kilometers per hour. The limbs of seals are fins.

The hind limbs are connected to the tail, always backwards, and cannot walk, so they are very clumsy on land. As a result, scientists believe that the ancestors of ringed seals should have passed through the Yenisei River and its tributaries, which originate in Lake Baikal.

The Angara River came here.

The exact timing of the arrival of seals on Lake Baikal remains a mystery. However, scientists speculate that the arrival of seals here is most likely to occur during the ice age. At that time, the Yenisei River and An.

The Gara River basin has long been covered with snow and ice, the riverbed has deepened, and the range of seals living in the Arctic Ocean has expanded to the south, and they have traveled thousands of kilometers to reach Lake Baikal. And when the ice age ends, the river flows.

As the riverbed became shallower, these "guests from afar" stayed here and evolved into the world's only freshwater seals.

Baikal seals are currently the only one in the world that can be found in fresh water.

Seals survive. But how they came to settle in the lake is difficult to explain. It is generally accepted in the scientific community that Baikal seals come from the Arctic Ocean, as they are most closely related to the seals there.

Near. However, according to the data, the southern part of the Siberian Plateau, where Lake Baikal is located, has not been submerged by the sea for more than 500 million years. How the ancestors of the Baikal seal came from the distant Arctic Ocean to such a completely different environment.

and continues to this day, and there are still different opinions.

Baotu Spring is a seal, not a sea lion. And it's a saltwater seal, and it's been released into freshwater, not a freshwater seal.

Real freshwater seals in Lake Baikal, Russia.

In the southern Lixia District of Jinan, it is known as the first spring in the world, and the earliest 5A-level tourist attraction Baotu Spring is the symbol and symbol of Jinan, which was recorded in the Spring and Autumn Period as early as 2600 years agoNow there are two spotted seals living in it, so are seals really suitable for surviving in the springs?

Seals usually live in the sea with a high salt water environment, although there are freshwater seals such a species, but just in the spring water is certainly not adaptable, which needs to sprinkle a large amount of salt in the spring water to simulate the growth environment of seals, even so, because of the flow of water, the concentration of water after sprinkling salt can not reach the standard of seawater, so it needs to be replaced many times, 3 times a month in summer, 2 times a month in winter, but this is tantamount to a drop in the bucket.

Originally, this was a completely wrong question, and there was a scientific basis for raising seals here. In fact, some old Jinan people know that as early as the seventies and eighties of the last century, seals were raised in Baotu Spring, so many old Jinan people are used to calling this "seal pool". Although many seals have died in Baotu Spring, the reason why seals are still alive in the spring is due to professionals in the field of zoology in Jinan, who have studied feeding newborn seals with salt and other trace substances unique to seawater, and at the same time adding seawater essence to the waters, so that seals can survive in the springs.

Chubby seals swim over and are very cute. Among the most lively places in Baotu Spring is here, one is Baotu Spring, and the other is the little seal here.

Seals usually live in the saltwater environment of the sea, although there are freshwater seals such a species, but just in the spring water is certainly not adaptable, which requires a large amount of salt in the spring water to simulate the growth environment of seals, even so, because of the flow of water, the concentration of water after sprinkling salt can not reach the standard of seawater, so it needs to be replaced with salt many times, 3 times a month in summer, 2 times a month in winter, but this is tantamount to a drop in the bucket.

The two seals were not ...... in the pool where the three streams of water from Baotu Spring were located

The two seals are in a separate pool more than ten meters northeast of Baotu Spring Pool, and the pool where the seals are raised is called Seal Pond, but the water in the pool is imported spring water.

So, the seal is not in the Baotu Spring Pool, don't get me wrong.

Probably the subject doesn't know that seals are divided into freshwater seals and saltwater seals, and freshwater seals can survive in Baotu Spring.

The seals in Baotu Spring are saltwater seals that have been artificially released into fresh water.

But there are really freshwater seals, and in Lake Baikal, Russia, the only seals in the world that live in freshwater.

I haven't asked about it, but every time I go to see it, it's very happy! It is also very moisturizing, the whole Baotu Spring, a leopard monopolized, pavilions, small bridges and flowing water, and the belly has the feeling of poetry and calligraphy.

This may have been introduced by Baotu Spring for the public to see, and seals are not suitable for living in fresh water.

Many of the markings on the animal's body are protective colors, protecting the animal from its enemies in certain environments and protecting itself.

In fact, seals are not very suitable for surviving in the springs, but they can survive.

Seals are certainly not suitable for living in the springs, and they are rationed salt every year.

This is not suitable, it may be that there was some accident in their original living environment.

The locals know that it has been raised for almost a century for half a century, and it is still not good. Speechless acquisition is homophony. If you say too much, you won't believe it.

That's right, because the water in the spring is also very suitable for survival.

It should be true, because Baotu Spring is named after this.

Of course not, they may just have strayed into the spring.

Come and release Baikal seals.

There are no more, and it is not allowed to be raised.

Every animal has its own habits, and this one is different.

Because the composition of fresh water is not the same as that of seawater, it may not satisfy marine life, (self-opinion).

Yes. Seals are the most widespread of the pinnipeds, with their footprints from the Antarctic to the Arctic, from seawater to freshwater lakes. The Antarctic seal population is the largest, followed by the Arctic Ocean, North Atlantic Ocean, North Pacific Ocean, etc.

The members of the seal family can be roughly divided into two groups, northern and southern, which can be divided into the seal subfamily and the monk seal subfamily, the seal subfamily is basically limited to the northern hemisphere, and the monk seal subfamily is not only in the southern hemisphere, but can also be found in the southern part of the northern hemisphere.

24 spotted seals were released into Liaodong Bay.

On April 11, 2019, the Ministry of Agriculture and Rural Affairs and the people of Liaoning Province jointly held a spotted seal release activity in Dalian City, and released 24 spotted seal pups into Liaodong Bay after being successfully rescued and assessed by experts and veterinarians to have the ability to survive in the wild.

Earlier this year, the Dalian Municipal Public Security Department cracked a case of poaching of large spotted seal pups. The Ministry of Agriculture and Rural Affairs, the Ministry of Public Security, the Ministry of Natural Resources, the National Forestry and Grassland Administration and the people of Liaoning Province formed a joint working group to go to the scene for investigation and supervision.

Three member units of the Ministry of Agriculture and Rural Affairs' Aquatic Wildlife Rescue Network, including Liaoning Academy of Marine and Fishery Sciences, Dalian Shengya Aquarium and Dalian Laohutan Ocean Park, have carried out rescue work for spotted seal pups. 61 harbor seal pups were successfully rescued, with a rescue success rate of more than 80%, which minimized the loss of harbor seal pups as much as possible.

The 24 harbor seal pups released in this event are the first batch of cubs that have been assessed by experts and veterinarians to be able to survive in the wild, and all other harbor seal pups will be released into the sea after the assessment is passed.

Yu Kangzhen, Vice Minister of the Ministry of Agriculture and Rural Affairs, said that the purpose of the event is to bring the rescued spotted seals back to the wild natural environment, and at the same time, through such activities, mobilize all sectors of society to pay attention to and participate in the protection of aquatic wildlife, and enhance the awareness of protection and law-abiding awareness of the whole society.

In the next step, the Ministry of Agriculture and Rural Affairs will work with relevant departments to strengthen the protection of aquatic wildlife and their habitats, and standardize the management and utilization of aquatic wildlife.

The world's only freshwater seal, underwater and on land, there is a world of difference.

What happens if you put saltwater fish in fresh water? As a result, something unexpected happened!

1. Because marine fish live in seawater, the concentration of salt in the cell is very large, if it is placed in fresh water, the water molecules will enter the cell because of the concentration difference, resulting in a decrease in cytoplasmic concentration and a larger volume, which affects the function. Conversely, freshwater fish will dehydrate when they are placed in seawater.

2. The salt concentration of marine fish body tissue is much lower than that of external seawater, and the specific gravity and density are high due to the large amount of salt in seawater. According to the principle of osmotic pressure, the water force in the body tissues of marine fish will continue to seep outward from the gills and body surface. In order to maintain water balance in the body, marine fish have to swallow large amounts of seawater to compensate for the water loss in their bodies.

However, due to the large gulp of seawater, the salt entering the body of the fish has also greatly increased, so in addition to removing a part of the salt from the kidneys, the marine fish mainly rely on the "chlorine cells" in the gill tissue to complete the task of salt removal.

3. Freshwater fish is very different from marine fish, the salt concentration of freshwater fish body tissue is higher than that of the outside water, that is to say, the salt concentration of freshwater is low, the specific gravity is low, and the density is small, according to the principle of osmotic pressure, the external freshwater will continue to enter the fish body in large quantities, for this reason, the freshwater fish only through the kidneys, will excrete excess water from the body.

4. Fish in different environments must live in an adaptive environment to survive.

Because the salt content in marine fish is high, and when it comes to fresh water, the salt content is low, and it will absorb water and swell to death.

This is the key.

The osmotic pressure of marine fish is higher than that of fresh water, so it will absorb water from fresh water and enter the body, and eventually cause the cells to burst and die.

Because the saltwater fish are put into fresh water, the original cell metabolism and osmotic balance of the saltwater is broken, and the salt content in the inhaled freshwater is almost zero, but the salt discharge system will also discharge a large amount of salt as before, in order to maintain the osmotic balance, the saltwater fish will continue to absorb water and expand, and finally die because of the cell burst.

The concentration of salt in seawater is much higher than the concentration of salt in fish blood and body fluids. Not only are the salted fish not salted, but the salt content in their bodies has not increased, and they are still free to live and reproduce in the sea. This is because marine fish have a strong ability to excrete salt, and this ability to excrete salt forms a kind of balance with the high concentration of salt in seawater – the osmotic balance.

There is a special membrane known as a semi-permeable membrane that allows only solvent molecules to pass through and not solute molecules. The two solutions are separated by a semi-permeable membrane, and the solutes of the two solutions are different, but they have the same osmotic pressure, that is, the amount of water entering and exiting on both sides of the membrane is the same, and the osmotic equilibrium is reached. Osmotic equilibrium is widely present in living organisms, and the cell membrane is a semi-permeable membrane in living organisms, which separates the intracellular fluid from the extracellular fluid, allowing only water molecules to pass through, while sodium ions, potassium ions, etc. are not easy to pass through.

Fish living in the ocean inhale a large amount of salt through breathing, and marine fish have their own way of regulating and can excrete the salt in the seawater they drink in time. For example, hard-boned fish have special salt-excreting organs in their gills, while soft-boned fish use the action of urea in the body to remove salt. This inhalation and expulsion are balanced, so the saltwater fish can survive freely.

The osmotic equilibrium is the adjustment of the water balance between the intracellular fluid and the extracellular fluid, and once broken, it will cause many reactions in the organism. If the cell is dehydrated for some reason and the concentration of intracellular fluid increases, the water of the extracellular fluid will penetrate inward through the cell membrane.

If the saltwater fish is put into fresh water, the original cell metabolism and osmotic balance of the saltwater is broken, and the salt content in the inhaled freshwater is almost zero, but the salt drainage system will also discharge a large amount of salt as before, in order to maintain the osmotic balance, the saltwater fish will continue to absorb water and expand, and finally die due to the bursting of the cells.

Marine fish cannot survive in fresh water. In the long process of evolution, the body of marine fish has adapted to the water body of the ocean, and their own osmotic pressure is lower than that of seawater, so the water will continue to be lost, so it needs to be replenished by river water. If they are placed in fresh water, the osmotic pressure of freshwater is lower than that of the fish, so water will enter from the surface of the body, causing the fish to eventually swell to death.

Marine fish cannot survive in freshwater. This is due to the difference in osmotic pressure between seawater and freshwater, and fish have gradually adapted to the osmotic pressure of the water they are in over a long evolutionary process. The osmotic pressure of the marine fish itself is lower than that of the seawater, so the water will continue to be lost from the body surface, it needs to drink water to replenish it, put it in fresh water, due to the osmotic pressure reversal, the water will continue to enter, resulting in its swelling and death.

Not only that, but many deep-sea fish also do not survive in shallow water, because they adapt to the water pressure in the deep sea and die in places with lower water pressure.