Are marine fish really safer than freshwater fish, and is there a risk of parasites?

Seafood is a common food on people's tables, not only delicious, but also has high nutritional value, and is favored by many people. I believe that in the eyes of many people, such as sashimi, drunken shrimp or choking crab, this kind of "raw pickled" seafood is a rare delicacy. But recently, there have been many reports that many people have been infected with parasites due to eating this seafood.

In daily life, some people think that marine fish are safer than freshwater fish, but this is not the case, and there is still a risk of parasites in marine fish.

The relevant personnel have also tested this, and various raw foods such as drunken shrimp and drunken crabs purchased in the vegetable market were found to have parasitic cysts in the drunken shrimp after testing in a professional laboratory. Cysts are simply the larvae of flukes, if they are eaten into the human body, they will be adsorbed to the intestinal wall of the body, and when the larvae grow up, they will even remain in the human body and invade various internal organs. Therefore, it can be seen from this that marine fish are not safer than freshwater fish.

Normally, the common parasites in China are liver flukes in freshwater fish and anisakis in marine fish, if you accidentally eat fish meat infected by parasites, parasites will parasitize in the body, causing various diseases in the body. For example, cholecystitis or gallstones, regardless of the type of fish, if not properly handled and cooked thoroughly, there may be a risk of parasites.

Due to the particularly hot weather in summer, many people like to go to the beach for vacation, and all kinds of seafood and aquatic products have naturally become an indispensable delicacy for people. Some people even like to eat some raw seafood, but they don't know that if the seafood is not processed properly, there are many parasites in it. For example, crayfish, sashimi or cold snails, once eaten raw or half-cooked seafood, it is likely to be infected and cause lung flukes, causing serious harm to the body.

Therefore, when buying seafood, it is necessary to choose a regular shopping mall, and the temperature of cooking seafood should reach 100 degrees Celsius and last for more than 5 minutes to completely kill these parasites.

Marine fish are indeed safer than freshwater fish, because marine fish live in the ocean and live in a deeper environment. In fact, marine fish also has a risk of parasites, so it must be processed and cooked when eating.

Of course not, there is a risk of parasites, and some diseases may occur in the process of breeding.

I don't think it's very safe now, because there are still a lot of viruses in the seawater, so these fish may also carry the virus.

Both freshwater and marine fish have parasites, so not eating them raw reduces the risk.

Many people think that only freshwater fish, shrimp and crabs have parasitic infections. Not really! Professor Li Hua of the School of Public Health of Southern Medical University pointed out that since the relevant investigation on liver flukes infected by eating freshwater fish in the Pearl River Delta region a few years ago, many diners who love to eat fish raw have begun to "switch" to seafood.

Although seafood does not have liver flukes, it does have other parasites that can also cause parasitic diseases. ”

It is related to the osmotic pressure of body fluids. The freshwater environment in which freshwater bony fish live is a hypotonic solution relative to cells, so the gills and ** of freshwater bony fish absorb water, the kidneys drain water, and replenish salt through salt cells and food, and in general, the osmotic pressure of body fluids of freshwater bony fish is not high. Seawater is a hypertonic solution relative to cells, so seawater fish absorb seawater, and then excrete salt through salt-secreting cells and other ways, and the osmotic pressure of body fluids is generally high.

The osmotic pressure of freshwater fish fluids is closer to that of humans living on land, so it is easier for freshwater fish parasites to survive in humans. The parasites in the body of marine fish will generally not live due to osmotic pressure, and a small number of such as Anisakis will cause damage to the human body but will also die in the human body. Seek adoption.

The strange insects of marine fish are usually in the internal organs of the fish when they are alive, but they may also move to the meat of the fish after a few days of death, so the risk of stale fish is greater.

Freezing below minus 20 degrees Celsius has the same effect of killing strange insects as heating, and sake also has a certain disinfecting effect.

Also, we know very well which fish is safer and which sashimi is safer.

In addition, these requirements are very strict in Japan, so the probability of strange insects actually occurring is very small.

In the unlikely event that the strange insects of marine fish enter the human body, ordinary strange insects can only live for a few days.

The symptoms are also stomach pain for 2-3 days, which is not so severe for the body.

But I don't know much about the situation in China, so it's hard to say...

Question: I see that there are reports in China that a large number of people get sick from eating raw fish, while Japan has a traditional report of eating raw fish, and it seems that there are no reports of large-scale diseases, especially since Japanese people have been eating raw fish but have a relatively high life expectancy, which is strange.

I don't think it's surprising about this.

Most of the people who get sick from eating raw fish in China are river fish.

In addition, according to the official website of the Tokyo Public Health Bureau, the number of people who suffered from food poisoning in Tokyo in the one year in 2005 was 2,518.

Most of them are bacteria and viruses, and parasites are only 2 people.

In addition, in the recent reports of strange insects in Japan, there are more spicy cabbages than sashimi.

Are there any parasites in the sea? Marine fish are very easy to be polluted, so those who love sashimi should pay attention!

1. It is difficult for marine fish to survive in fresh water. Because the concentration of tango cells in the body of marine fish is large, staying in fresh water will cause the cells to swell and die.

2. Reasons why it is difficult for marine fish to survive in fresh water:

1) Just like the "diving disease" and "altitude inadaptability" caused by sudden changes in the environment, it is a reason that people die. Generally speaking, it is because of the large difference in osmotic pressure between salt water and fresh water in the living environment, which leads to the failure of the metabolic function of marine fish and their death.

2) The sea water is dense and pressurized, and the fish will die in fresh water. Because the blood pressure of marine fish adapts to the pressure of seawater, the freshwater pressure is small after entering freshwater, and the blood pressure of marine fish exceeds the water pressure, resulting in blood vessel burst and death.

3) Some deep-water benthic fish, even if they are in the shallow sea or stay on the surface of the sea, there will be environmental pressure that is not adaptable and not easy to survive, in fact, it is also a "survival of the fittest" and the process of not being able to die.

4) In general, the cause of a large number of marine fish deaths is that their body functions cannot adapt to the huge changes in the living environment in a short period of time.

5) However, if the marine fish are domesticated for a period of time and then put into the remaining fresh water, it is still possible to survive. For example, salmon will move at the junction of brackish and fresh water in the coastal sea for a period of time before entering the river, and then go up the river and enter the freshwater to breed, at this time, their body functions have been adjusted to adapt to the situation of freshwater survival.

As the name suggests, the biggest difference between river fish and marine fish is the environment in which they grow. In fact, strictly speaking, river fish should be called freshwater fish, common carp, crucian carp, grass carp, silver carp, Wuchang fish, tilapia, eel, etc.; Marine fish include hairtail, tuna, large yellow croaker, small yellow croaker, mackerel, salmon and turbot.

1. Whether it is freshwater fish or marine fish, its nutritional composition is roughly the same, and the total nutritional value is very high.

First of all, fish is rich in protein, and the amount and ratio of essential amino acids contained in it are the most suitable for human needs, so it is a good protein intake for humans**. Secondly, the fat content in fish is less, and it is mostly composed of unsaturated fatty acids, and the absorption rate of the human body can reach 95%, which has the effect of reducing cholesterol and preventing cardiovascular and cerebrovascular diseases. Third, fish meat is rich in minerals, such as iron, phosphorus, calcium, etc.; Fish liver contains a lot of vitamins A and D.

In addition, fish meat has short muscle fibers and a high moisture content, so the meat is tender and easier to absorb than livestock meat. Compared to foods with high nutritional value but not easy to absorb, fish is better for people's health.

2. The nutrition and taste of marine fish are slightly better.

The nutritional content is similar, but it does not mean that the nutritional value of the two is exactly the same. Marine fish have more nutrients than river fish, and their nutritional value is slightly superior.

The sea is extremely rich in nutrients, especially a lot of nutrients, which makes marine fish higher in minerals and vitamins. In addition, the liver oil and body oil of marine fish contain a highly unsaturated fatty acid that is not found in terrestrial animals and plants, and it contains an ingredient called DHA (commonly known as brain**), which is an essential nutrient for the brain and is important for improving memory and thinking skills. In addition, the content of omega-3 fatty acids and taurine in marine fish is much higher than that of freshwater fish, which has a protective effect on the heart and brain.

In terms of taste, the taste of marine fish is also fresher than that of river fish. This is because the swimming range and force of the sea fish are greater than that of river fish, which makes its muscles elastic better and delicious. River fish, on the other hand, have an earthy smell because they grow in water with a lot of humus.

Such an environment is suitable for actinomycetes to multiply and grow, and bacteria invade the bloodstream through the gills and secrete a brown substance with an earthy smell that is difficult to remove during cooking.

3. It is best to eat cooked marine fish, raw food will cause severe abdominal pain and allergies due to Anisakia infection; Freshwater fish is eaten to see if it has been caught from contaminated water, which contains toxins that can be harmful to health.

Different people have different physiques and are particular about eating different fish. Of course, there are also people who are not suitable for eating fish, such as people with high purines, who are easy to get ventilation, so they can't eat seafood.

I think that in terms of taste, marine fish is also fresher than freshwater fish. This is because marine fish have a greater range of movement and the force with which they swim than freshwater fish, making its muscles more elastic and delicious.

Eat the traces of the sea tree, run to the lotus, and go high, and "end."

It should be a sea fish, and the mineral content is sued, hehe