Why not eat fish that die when red tide occurs

The main reasons why red tides destroy resources such as fish, shrimp, shellfish, etc. are:

1. Destroying the erbium foundation of the fishery and reducing the production of the fishery.

2. The abnormal reproduction of red tide organisms can cause mechanical blockage of the valves of economic organisms such as fish, shrimp and shellfish, causing these organisms to suffocate and die.

3. In the later stage of red tide, a large number of red tide organisms die, and under the decomposition of bacteria, it can cause serious oxygen deficiency in the environment or produce harmful substances such as hydrogen sulfide, so that marine organisms die of hypoxia or poisoning.

4. Some red tides contain biotoxins in their bodies or metabolites, which can directly poison fish, shrimp, shellfish and other organisms.

Some red tide organisms secrete red tide toxins, when fish and shellfish are in the toxic red tide area, ingestion of these poisonous organisms, although they cannot be poisoned, but the biological toxins can accumulate in the body, and their content greatly exceeds the acceptable level of the human body when eating. If these fish, shrimp and shellfish are accidentally eaten, they can cause human poisoning, and in severe cases, they can lead to death.

At present, more than 10 kinds of shellfish poisons have been identified as shellfish poisons, which are 80 times higher than cobra toxins and more than 100,000 times stronger than general anesthetics, such as procaine and cocaine. The symptoms of shellfish poisoning are: initial numbness of the lips and tongue, progression to numbness of the limbs, accompanied by dizziness, nausea, chest tightness, unsteady standing, abdominal pain, vomiting, etc., and in severe cases, coma and dyspnea.

Human poisoning incidents caused by red tide toxins occur frequently in coastal areas of the world. According to statistics, there are more than 300 shellfish poisoning incidents due to red tide toxins worldwide, and more than 300 people have died.

Red tide dead fish, what is the cause of fish death? Whether there are harmful substances in the body of this kind of dead fish is the key to the problem.

I think that after the occurrence of red tide, a large amount of oxygen is consumed in the water body, and most of the fish die of hypoxic suffocation. It is unknown whether toxins or other harmful substances are produced in the body when the fish die due to lack of oxygen, but the taste must not be as good as that of a normally caught fish. But after eating, it should not cause serious consequences of death!

It is better not to eat this fish.

Many people may think that the dead fish and shrimp on the street are due to the improper transportation of the fish, resulting in the death of the fish. But many people don't know that every time a red tide occurs, a large number of fish and shrimp will die, why is that? To understand this, we must first understand what red tide is.

Red tides, also known as red tides, are a marine disaster. When present, the sea water will be red, yellow, green or brown. This is due to the accumulation of phytoplankton, protozoa or bacteria in the sea.

There are many reasons for this phenomenon, some are naturally occurring, but most are man-made. In recent years, a large amount of offshore fishery wastewater, agricultural and aquaculture wastewater and industrial wastewater have been discharged into the sea, resulting in eutrophication of sea water bodies and the formation of red tides.

Some red tide organisms secrete substances that are poisonous, and after being ingested by fish and shrimp, they will be poisoned and die. In addition, red tide creatures decompose when they die. This process requires a large amount of oxygen, creating an oxygen-deficient environment.

So there are also a large number of marine creatures that are suffocated to death. The dead fish and shrimp drifted along with the red tide and were finally photographed ashore with the tide.

Some black-hearted merchants take the opportunity to pick up dead fish and shrimp, and then sell them at a low price in the market. But in reality, these fish and shrimp are not only not fresh, but also contain toxins. People can cause food poisoning when they eat it, so we must pay attention to identification when buying seafood.

At present, the amount of pollutants discharged into the sea by human beings every year is calculated in 10 billion tons. But no matter how big the ocean is, there will be a day when it can't be digested. For the sake of human survival, I hope that everyone can protect the sea and protect our homeland.

Because the red tide brings a lot of toxic substances into the seawater, which is not good for the fish, the fish cannot survive, so they die.

Red tides are caused by the eutrophication of seawater, which causes many more elements in the seawater, and these elements cause abnormal changes in the water body and cause death.

Because red tides have a lot of fungi that multiply and grow, they take away a lot of nutrients and oxygen from the water.

Because red tides affect the oxygen content in the water, which can kill the fish.

Because there are a lot of bad things in the red tide, and then after the red tide, many fish will run aground.

This is because there are many different elements that will be produced in the sea where the eating of the pilgrimage occurs, and the fish will not be able to continue to live.

Because there are a lot of fish coming to the beach, they will run aground on the shore.

Because it is still there that all the oxygen has been sucked out, and the fish will die without oxygen.

When the tide rises, the fish swim to the shore, and a lot of the fish eventually go down to the shore and the fish are afraid that they will die.

Fish also eat algae, but one is too much to eat; Second, algae are harmful to fish.

Red tides are a phenomenon that occurs directly or indirectly with the sudden growth of plankton such as closed algae. Red tide is a complex ecological anomaly, and the causes of its occurrence are complex, but it is generally believed to be closely related to marine eutrophication.

When red tide occurs, plankton in the sea proliferates so much that fish simply don't have time to eat them. At the same time, plankton clog the gills of fish, causing respiratory problems in fish; They decompose after death and rapidly consume oxygen, which is insufficient in the water; Some algae can secrete substances that are harmful to aquatic organisms, which can cause a large number of fish to die.

Answer]: The death of the b-fish may be caused by red tides; Corrosion of buildings can be caused by acid rain. Therefore, choose B.