Why can t fish live on shore? Why do you die when you bring fish ashore

Mudskippers can stay on the shore in humid conditions for a short time.

The reason why the hairtail fish "dies when it comes out of the water": after the hairtail fish is quickly caught ashore, the external air pressure becomes smaller, and the internal pressure is still very large; The extreme pressure difference causes oxygen and nitrogen in organs and tissues to precipitate out of the blood, blocking blood circulation and even causing organ rupture, resulting in the death of hairtail fish (commonly known as "decompression sickness").

Since we talk about hairtail, let's make a recipe for hairtail:

Pan-fried hairtail] Ingredients] hairtail, eggs, flour, green onions, ginger, Sichuan peppercorns; Refined salt, cooking wine.

Steps] Step 1: Select the hairtail with firm flesh and bright appearance, remove the internal organs and wash them, then cut them into sections and drain them for later use.

Step 2: Shred the green onions and ginger for later use.

Step 3: Put the hairtail fish into a basin, add cooking wine, refined salt, Sichuan peppercorns, green onion and ginger shreds and stir well.

Step 4: Beat in an egg, add an appropriate amount of flour, and mix well. Evenly hang the fish with egg powder batter. Marinate for an hour.

Step 5: Before putting into the pot, pick out the green onions, ginger shreds, and peppercorns, and put the marinated hairtail segments on a plate.

Step 6: Boiled a little oil in the pot, the oil temperature is 6 into the hot into the hairtail section, after the outside is set, change to medium-low heat and fry, repeatedly turn over to make the hairtail section evenly heated, fry until golden on both sides, and then dip it in pepper and salt to eat.

Cooking tips:

1. Put the pot in the pot at high oil temperature to instantly shape the outside of the hairtail and achieve the purpose of non-stick.

2. After the outside is set, turn to medium-low heat and fry. The surface of the high-temperature fried hairtail, and the inside of the low-temperature fried hairtail.

3. Wrap the egg batter before frying the fish, which can make the hairtail section produce a crispy flavor and can also be used as a heat insulation material.

Protects the tender flesh of the fish.

Fried hairtail, some people coated with starch, some people coated with flour, in fact, it is not delicious, teach you the most fragrant method. This fragrant fried saury is ready, hang the whole egg batter, no pot will stick to the pan, the charred and crispy fish meat is tender, it is really satisfying.

Because the water pressure in the deep-sea area is very large, the hairtail fish living in the deep-sea area has adapted to this water pressure, and once the fish is fished ashore, the internal organs of the hairtail fish will suddenly become less due to the pressure, so the hairtail fish caught ashore are dead.

Marine fish live in the vast ocean all their lives, while freshwater fish live in the freshwater of rivers, rivers, lakes and streams throughout their lives. During the tens of millions of years of evolution, fish have lived and multiplied, passed down from generation to generation, creating two major systems that live in different waters. Generally speaking, the salt concentration of seawater on Earth is much greater than that of freshwater.

Fish have great adaptability to the salinity of the water environment, and all kinds of fish can live normally in waters with different salinity, which is related to its perfect physiological regulation mechanism, but the regulatory effect is limited to a certain salinity range, otherwise its survival will be affected.

The salt concentration of marine fish body tissue is much lower than that of external seawater, and the specific gravity is high and dense 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 continuously seeps out 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 amount of salt entering the fish has also increased greatly, so that in addition to removing some salt from the kidneys, marine fish mainly rely on chlorine cells in the gill tissue to complete the task of salt excretion.

Fish adapt to the salinity of the water environment greatly, all kinds of fish can live normally in different salinity waters, which is related to its perfect physiological regulation mechanism, but the regulatory effect is limited to a certain salinity range, the salt concentration of seawater on the earth is generally 35%, and the salt concentration in fresh water is only about that, the difference between the two is huge, when the difference in salinity is too large will affect its survival.

If they are placed in fresh water, water molecules will enter the cells due to the difference in concentration, resulting in a decrease in cytoplasmic concentration and a larger volume, affecting the function and swelling of water absorption. Conversely, freshwater fish will dehydrate when they are placed in seawater.

No. Freshwater fish cannot survive in the sea. Freshwater fish live in freshwater, and the osmotic pressure of the water is lower than that in the fish's body, so the water will gradually seep in from its surface, and the fish need to keep draining to maintain balance.

Marine fish, on the other hand, live in salt water, and the osmotic pressure of salt water is higher than that of the fish, so the water will gradually be lost, and the fish need to drink water constantly. If freshwater fish are released into the seawater, it will die due to the high salinity.

Fish have the characteristics of being suitable for living in water: the color of the body of the fish is the protective color of the fish. The body is streamlined, large in the middle and small at the end.

The surface of the body is covered with scales to protect the body; There is a layer of mucus on the surface of the scales, which reduces the resistance of the water when swimming. There is a lateral line on both sides of the body, which is connected to the nerve, which is mainly used to determine the direction and sense the flow of water. The body of a fish has pectoral fins, dorsal fins, pelvic fins, and caudal fins, which are the locomotor organs of the fish in the water.

The fish breathes with its gills touching the blue. There is a swim bladder in the body, the main role is to regulate the specific gravity of the body, the swim bladder in the coordination of the fins, can make the fish stay in different water layers.

Fish belong to the lower animals of vertebrates because they cannot live without water all their lives, breathe with gills, heart-atrium-ventricles, a circulatory route, and arterial and venous blood are mixed; In particular, the reproduction of fish is naturally hatched by in vitro fertilization, and the body temperature is not constant.

The role of the fin: The dorsal and anal fins mainly play a stabilizing and balancing role when moving. The tail fin cooperates with the muscles on the side of the body to promote the noisy body of the fish segment and grasp the direction.

The main function of pectoral and pelvic fins is to maintain the balance of the fish, cooperate with the body of the fish, and adjust the lifting of the fish. However, pectoral fins are more versatile than pelvic fins, and they can be used like oars to move the fish forward slowly.

Because the gills of a fish are only adapted to absorb oxygen from the water and cannot absorb oxygen from the air, it can only live in the water.

The environment is different, if you are put in the water, you will not survive.

It's like you can't live in the sea.