What is the reason for grass shrimp to crawl and climb sand holes at night?

There are generally several reasons for this! 1.Is it normal to find bait to eat? Since the feeding time is mainly at night and the demand for bait increases in the middle and late stages, if the feeding is insufficient, the shrimp will go ashore to find food. Observing the time of shrimp staying on the shore can determine whether the shrimp behaves normally.

2.Is there a lack of oxygen? Observe the size and size of the number of shrimp landing, if the number is dense and the size is both, it can basically be confirmed that there is a problem with the water quality.

However, it is necessary to distinguish between the simple lack of oxygen or the deterioration of water quality caused by the increase of harmful substances at the bottom of the water, and the specific water conditions should be carefully checked and the water quality should be identified.

3.Is the water quality getting worse? In addition to the occurrence of the phenomenon described in 2, carefully check the physical condition of the shrimp and the condition of the water body. Once the water quality deteriorates, such as inverted algae, moss breeding, mud skin decay, etc., shrimp will be sick and cause losses, which should be prevented.

4.Are shrimp sick? Shrimp suffer from inflammation such as swollen gills and intestinal edema, which leads to a decrease in shrimp's ability to resist stress, and it is forced to float to the surface of the water body when it is difficult to tolerate the bottom environment. It reflects that the shrimp have become unaccustomed to the environment and have developed a stress response to it.

The phenomenon of lying on the edge or jumping into the pond is an abnormal manifestation of shrimp and a signal that it is not adapted to the water environment. Among them, the shrimp lying on the edge is often caused by bottom organs, water stratification, anaerobic decomposition, toxicity production, acid production and other reasons. If the prevention and control are not taken in time, there will often be undesirable phenomena such as muscle necrosis, stealing death or cramps, unsuccessful shelling, soft shell, red body, jejunum and empty stomach, and hard shell shrimp after a few days.

Aquatic animals grass shrimp, turtles and turtles, and yellow eels all have the habit of traveling on the sand at night, and they also have to absorb fresh air and a lot of oxygen, that is, they are spawned by the aura of heaven and earth, and develop their descendants.

This is the natural habit of living things, and they are innate, just like the phototaxis of some organisms.

I remember when I was in the countryside, if I saw a mud hole by the river, I would generally habitually reach out to see if there were fish, crabs, yellow eels and other delicacies inside. And if there is a sand hole on the beach by the sea, what good things will be hidden inside?

On the beach by the sea, a man abroad found a very special small hole, which did not look like people playing with sand; The sea sand around the cave is quite dry, and it is unlikely that there are marine fish, shrimp and other seafood hidden underneath, and even if there were, it would have died of lack of water a long time ago.

However, the man was still curious to dig it up, but he didn't expect that this digging would make him have a big harvest; What the hell is it?

It turned out that the man kept digging out the sand towards the sand hole, and before he could dig deeper, he saw that there were things hidden inside, which turned out to be round objects wrapped in sea sand, and there were still a lot of them.

These round objects don't look like shells and mantis balls or other garbage, the shells are hard, more like eggs. Eggs on the beach may be sea duck eggs, turtle eggs or eggs from other birds.

But the duck eggs and bird eggs we usually see are relatively oval, and the appearance does not match these eggs; Moreover, the number of eggs laid by sea ducks and birds is not so large. Haha, of course, some friends have already seen that so many eggs hidden under the sand cave are actually turtle eggs! That's right, it's turtle eggs!

It is not surprising that turtles in the sea climb onto the beach to lay eggs, the sand on the beach is relatively dry, and the temperature reached by absorbing heat under the sun is relatively high, which can make the fertilized eggs in the turtle eggs continue to grow, which is conducive to the smooth hatching of the eggs.

And the number of eggs laid by sea turtles is also relatively large, several eggs a year, those times are laid in the same hole, dozens or even hundreds of eggs are laid at a time, so it is not surprising that men find so many turtle eggs.

The survival rate of baby turtles that hatch naturally is 1 in 1,000, so how many baby turtles can produce so many turtle eggs to survive? Maybe not one!

After the man found the turtle eggs in this hole, he picked them all out and put them into a bag one by one and took them home, feeling a little greedy; Maybe there are a lot of these things there, and there are also a lot of turtle eggs in this hole. Do you agree with the man's approach?

Use casting paints.

The traditional casting coating only plays a blocking and isolation role in the middle of the casting and the casting mold to achieve the purpose of anti-sticking sand, but sometimes it will also produce defects such as sticky sand, sand holes, pores, and carbon slag in the casting.

Sand sticking is because of the poor adhesion of the coating, when the sand filling vibration causes the paint to peel off or the high-temperature liquid metal is oxidized and the coating and the casting chemical reaction occurs to generate metal oxides, the coating and the sand have strong adhesion, can firmly adhere to the surface of the casting to form a series of low melting point compounds in the thick wall and corner of the casting, etc., the low melting point is more, and the sand layer is later), resulting in the casting sticking sand.

The casting sand hole is caused by the low strength of the coating, poor fire resistance, and the inability to resist the erosion of high-temperature metal liquid, and the molding sand is rolled into the casting.

There are many reasons for the porosity of castings, in a word, it is because there are more substances with large gas generation in the cavity, fast gas generation speed, poor air permeability of paint and sand, and gas is not removed in time.

The new casting coating developed by our factory is improved and adjusted on the basis of the traditional casting coating, which can effectively prevent the oxidation of high-temperature liquid metal, and does not have a chemical reaction in contact with the mold and high-temperature liquid metal. And it can absorb and digest nitrogen, sulfur, carbon and other gases.

So as to completely solve the casting sand, casting roughness, casting porosity, casting inclusion slag, ball grinding iron variation, cast steel sulfur cracks, carburization defects, etc.

1.What is the longest car in the world besides the train? (Answer:.)

Santa Claus) 3.Why don't eggs rot when you hit an egg against a stone? (Answer:.)

Of course it won't rot if you hit a stone with an egg) 4.Xiao Ming said to Xiao Hua: I can sit in a place where you will never be able to sit!

He sits in **? (Answer: Xiaohua's body).

Think about it, what is the biggest shadow you see? (Answer: The shadow of the earth, i.e. every night).

Arrange 24 people into 5 people, 6 rows in the city, how to arrange them? (Answer: Arrange it in a regular hexagon).

47 Four people were playing mahjong in a hut (no one else was watching), and then the police came, and all four of them ran away, but when the police got to the house, they caught another person, why? Answer: Four people played a man named "Mahjong" in the house, and the police caught him.

The three days are called Jing, the three wood are called Sen, the three stones are called Lei, what are the three ghosts called--- they are called help.

Xiaobai plus Xiaobai is equal to - Little White Rabbit.

Xiaobai looks a lot like his brother - the truth is revealed.

There are 6 steamed buns in the basin, and each of the 6 children gets 1, but there is still 1 in the basin, why? Answer: The last child took the pot away.

Winter melon, cucumber, watermelon, pumpkin can be eaten, what melon can not be eaten? Answer: Fool.

Well, there are a lot of things that are hard to say here. Go to my Q-Space 214472884

What kind of wheel just doesn't turn? (Answer:.)

Ask which leg is longer in gold, wood, water, fire and earth, and answer ham sausage

What is the cause of the Gerbil Cave Concentration Camp Slope? Quite simply, because the temperature outside is very high, the rats hide in the shady slopes to cool off.

If the nozzle is too small or the furnace temperature is too high, I am doing the inverted mold, so I can communicate with it.

When pouring, the speed is too fast! There's air in the middle of the liquid!

Under normal circumstances, it should be a kind of crab, and Yangjiang people call it "sand horse" or "sand grasshopper".