How To Treat Fish For Opisthorchiasis: How To Salt, Fry Or Stew

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How To Treat Fish For Opisthorchiasis: How To Salt, Fry Or Stew
How To Treat Fish For Opisthorchiasis: How To Salt, Fry Or Stew

Video: How To Treat Fish For Opisthorchiasis: How To Salt, Fry Or Stew

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Video: What salt is safe? Fish Vet's advice on using salt for freshwater fish in aquariums and ponds 2023, February
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Page content

  • How to treat fish from parasites
  • How much salt should be

    Does table salt kill opisthorchiasis?

  • At what temperature does opisthorchiasis die in fish?

    How much to fry

  • How is opisthorchiasis transmitted?
  • Which fish is infected with this helminthiasis

    In what fish is opisthorchiasis most often detected?

  • Total what to do with fish

    Cooking over a fire or in the oven

  • You can defeat parasites!

On the eve of New Year's holidays for the festive table, residents of Russia are actively buying fish such as the carp family. But not all of them suggest the danger of those river aquatic vertebrates that are not properly processed.

We are talking about insufficient heat treatment of lightly salted and non-cured fish. This manufacturer's flaw can cause opisthorchiasis, that is, helminthic invasion. In this article, we will tell you in detail how to process fish for opisthorchiasis so as not to put yourself at risk.

What to do in such a situation? To get started, we recommend reading this article. This article details the methods of dealing with parasites. We also recommend contacting a specialist. Read the article >>>

Opisthorchis Felineus
Opisthorchis Felineus
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Image

Opisthorchis Felineus

How to treat fish from parasites

The best way to get rid of any infections that might end up in fish meat is by cooking it. However, it is permissible to eat it in another form. You should know how to salt fish to kill opisthorchiasis and what safe cooking methods exist.

The most dangerous for consumption is stroganina - raw fish meat, cut into thin slices. In this case, it is not processed, so there is a possibility of contracting opisthorchiasis and any other parasitic or bacterial infection.



How much salt should be

Salting is a fairly reliable way to destroy parasites, if everything is done correctly. The main thing is to add a lot of salt. The fish should be covered with salt in layers, without adding water - it will cook in its own juice. Before salting, it should be well processed, washed, and the insides removed.

How much to salt river fish? The minimum that fish meat should be kept is five days. After that, it becomes safe to consume. If a piece weighs more than one kilogram, it should be consumed only after 8-10 days. The smaller the amount of meat, the earlier it becomes edible. If the volume and mass are large, it is advised to cut it into small pieces.

Does table salt kill opisthorchiasis?

Salting also requires compliance with certain rules:

  • Salt fish specimens weighing up to 65 g for 2 weeks.
  • Larger fish up to 150 g for 3 weeks.
Does table salt kill opisthorchiasis?
Does table salt kill opisthorchiasis?
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Image

So much salt is taken to create a high concentration of salt in the muscles of the fish (2 kg salt / 10 kg).

The soaking process relieves the fish product from excess salinity, but does not contribute to its additional disinfection.

You should be careful when buying salted fish from spontaneous markets where there is no laboratory control.

In appearance, an infected fish cannot be distinguished from a healthy one. Only a microscopic examination of muscle tissue can reveal metacercariae.

After cutting the fish, knives, boards and other utensils should be doused with boiling water and washed.

Get tested for worms

Symptoms Answer Itching in the anal area Yes Not Dysbacteriosis Yes Not General weakness Yes Not Dry cough Yes Not The appearance of allergic reactions Yes Not Weight loss Yes Not Headaches Yes Not Dizziness Yes Not Increased irritability Yes Not Swelling of the face and eyelids Yes Not

At what temperature does opisthorchiasis die in fish?

You can also destroy the infection with the help of low temperatures, with freezing. How many days in this case can you eat it? Keeping the meat at a low temperature should be at least three weeks - after that it becomes safe to eat.

Meat should be kept for at least three weeks if the freezing temperature is 8-12 degrees, as in most refrigerators. If it is possible to freeze meat at minus 28-30 degrees, the infection will die faster, in a few days.

How much to fry

Opisthorchiasis is a rather tenacious parasite that can survive even after heat treatment, so there are also special rules that must be followed when cooking.

To be sure to eradicate any infection in fish meat, it should be cut into small pieces that are easier to fry completely. Fry and boil under a closed lid - the likelihood of destroying eggs and larvae increases. Before frying, it is advisable to boil the fish for 10-15 minutes.



How is opisthorchiasis transmitted?

When opisthorchiasis is mentioned, the prevention of the disease does not at all include a ban on the consumption of fish products. On the contrary, fish is considered a healthy food, which is indicated for consumption by both children and adults of all ages. You just need to be able to distinguish between affected fish from healthy and clearly know how opisthorchiasis is transmitted.

Opisthorchiasis is transmitted not only by eating seafood, but also through the feces of infected carnivores or an infected person.

These waste products are saturated with worm eggs, and if simple hygiene rules are not followed, the arrangement of toilets can get into open water bodies.

In fresh water, worms find "refuge" in the body of mollusks. Then, after two weeks, they start "free swimming". Here they are devoured by the fish, which is the source of the spread of the disease.

Method of infection Fecal-oral
Causative agent Feline fluke (opisthorchis hepatic fluke)
Distribution source Fish of the carp family living in the Ob, Yenisei and other rivers

Another way of infection is through a pet that loves raw fish. In this case, it is not enough to know how to kill opisthorchiasis. After all, it is dangerous to show mercy, to hug with such a cat, dog and cat! Worm eggs can enter the human body through hands, dirty nails. In this case, children are at risk.

Worms live in all fish, including the salmon family and pike. But the causative agents of opisthorchiasis prefer freshwater fish of the cyprinid family. At risk are amateur fishermen who love to fish and cook "outdoors". Uncooked food, under-smoked products cause infection.

The place of spread or foci of the disease is the regions of Siberia and Transnistria. According to statistics, in this area every fourth native inhabitant is sick with opisthorchiasis. The infection proceeds in a sluggish form, without complications: therefore, it is so difficult to recognize it. Only residents of the North Caucasus can be diagnosed with an acute degree of opisthorchiasis with fever and other symptoms.

In some infected people, the worm survives even 40 years. Therefore, attention must be paid to diagnostic examinations of all family members, even in the absence of characteristic signs of the disease.

Which fish is infected with this helminthiasis

The feline fluke chooses fish living in fresh open reservoirs as its owner, most often representatives of cyprinids are infected. Sea and ocean inhabitants do not get sick with this helminthiasis, as they live in salt water. Red fish can only become infected if they are bred in fresh waters.

In what fish is opisthorchiasis most often detected?

Among the inhabitants of open fresh water bodies, opisthorchiasis is ill with representatives who feed on infected molluscs, crustaceans or small fish.

Most often, ide, perch, carp, dace, ram are infected with opisthorchiasis, much less often the named fish parasites infect sterlet.

The list of fish carriers of opisthorchiasis also includes the following:

  • bream, carp, roach, carp, crucian carp (representatives of the carp family);
  • perch, ruff, catfish, wrasse (perch);
  • thorn, sturgeon (sturgeon);
  • karelian trout, musk, nelma, white fish, grayling, peled or cheese (salmon).
  • Many representatives of the salmon family are considered gourmet varieties, which are present in most dishes raw, and although salmonids rarely get helminthiasis, there is still a risk of infection.
  • Trout belongs to salmon, therefore it is practically not susceptible to helminthiases, but Karelian trout, which is grown in artificial reservoirs, is easily infected with cat fluke.
  • Previously, it was believed that sterlet and sturgeon do not get sick with helminthiasis, but recent data indicate that some of them also contain parasite larvae due to pollution of water bodies with waste (feces, sewage, garbage).



Total what to do with fish

Almost all representatives of the cyprinid family are susceptible to opisthorchiasis infection. Among them: roach, sabrefish, silver carp, bream, asp, rudd and others. Yazi and perch are especially often infected, but sturgeon specimens are considered relatively safe.

Marine life is devoid of this parasite, with the exception of some species that can move from salt water to fresh environment (muksun). The northern peoples are very fond of eating this fish in its natural form, so they have a high risk of opisthorchiasis.

Predators are less susceptible to disease, but there are cases when flukes are found in pikes if they eat infected young carp breeds. Moreover, opisthorchiasis is found not only in fish, but also in caviar, which must be taken into account when processing the prepared raw materials.

The ambassador is carried out in a strong saline solution, which is prepared at the rate of 1 kg of salt for every 5 kg of fish that needs to be stacked in layers, do not pour water. Before salting, the fish is carefully examined, washed, and the insides removed.

How much to salt the fish to kill opisthorchiasis depends on its size, for example:

  • small fish - 2 weeks;
  • if the length is 20-25 cm - 3 weeks;
  • large specimens over 25-30 cm - at least 5 weeks.

With a small amount of fish, the cooking time is reduced in proportion to the weight and volume of the raw material; the minimum for salting is 10-14 days.

Opisthorchiasis dies only when hot smoked for 2 hours at a temperature of at least 80 degrees. On the contrary, cold smoking does not kill parasites, the larvae can maintain their viability, so this method is not suitable for river fish or requires preliminary freezing or salting.

This method is safe in terms of infection with opisthorchiasis, if the temperature and freezing times are observed per 1 kg of raw material:

  • at -10 degrees Celsius, fish should be kept in the freezer for a month;
  • at -15 degrees, 2 weeks are enough;
  • at -28 degrees it takes two days;
  • at - 35 only 15 hours;
  • at - 40 degrees, 8 hours are enough.

The consumption of freshly frozen fish (sliced ​​fish) is considered dangerous, the product prepared in this way does not guarantee the destruction of the larvae.

Cooking over a fire or in the oven

The difficult question is how to kill opisthorchiasis, for example, in a large asp. Purchased or caught large fish must be pre-processed by cutting into small pieces of 100-120 g. It is necessary to cook or stew with water under a lid for at least a third of an hour from the moment of boiling, the pieces must be fried in a pan, turning them over from all sides.

At the same time, the kitchen must have separate cutting boards for fish, meat and finished products. You can use again only a board treated with detergent solutions and washed with boiling water. How to cook fish in the oven? Pies must be baked for at least 60 minutes at a temperature of 180-200 degrees.

To reduce the risk of infection, all fishing enthusiasts need to know how to kill opisthorchis in fish, it is easier to prevent this serious disease than to cure it later.

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