After visiting the market yesterday, the reporter found that in addition to fresh oysters, chilled and frozen oyster meat is also available in the wholesale market, and it is a "frequent visitor" of teppanyaki in hotels and restaurants.
Oysters with worms can be eaten when cooked.
A few days ago, a citizen posted on Weibo that he had eaten an oyster with parasites in a famous oyster barbecue restaurant in this city. In the released photo, a pink bug is lying on the shell of an oyster, which is very eye-catching.
In midsummer, oysters are the darling of supper, so once this Weibo was issued, it was forwarded more than 3,000 times, and many citizens said that they would never eat oysters again. Yesterday, the reporter interviewed Zhu Xuancai, an expert in aquatic products, at the Shanghai hotline 123 16. He said all animals have parasites in their bodies. As long as it is cooked, it will not affect your health.
Zhu Xuancai said that the existence of parasites in animals is a common phenomenon, and the key lies in whether it is cooked and killed when eating. "If you eat undercooked oysters or raw oysters and there are parasites in them, you are at risk of infection." In addition, if there are too many parasites in aquatic products, it will also affect the meat quality and taste, because the nutrients in them are eaten by parasites. Therefore, Zhu Xuancai suggested eating cooked or roasted oysters as much as possible to avoid the risks caused by parasites.
It is difficult to tell the difference between life and death between chilled and frozen oyster meat.
Dead oysters are more dangerous than parasites in oysters. After visiting the aquatic products wholesale market in Shencheng yesterday, the reporter found that although the high-risk half-shell oysters have disappeared after the rectification by the relevant departments last year, there are still chilled and frozen oysters with shells for sale. At that time, it was hard to say whether they were dead or alive.
In Tongchuan Road Aquatic Products Market, many stalls facing the street have oysters for sale. The reporter strolled around and found that almost all the oysters here are completely shelled, and the price of each oyster ranges from 4.5 yuan to 6 yuan. However, compared with 189 yuan, South African and French oysters were put in a thermostatic fish tank, most of the domestic oysters produced in Zhanjiang, Guangdong Province were put in cartons and piled directly in the open air. The reporter saw in front of a booth that five boxes of oysters were placed directly on the roadside without any fresh-keeping measures. The stall owner said that these oysters have just arrived and will not spoil.
So are there any dead oysters on the market? "As long as there is no opening, it is alive. It's easy to tell. We sell more than a dozen cases a day, all of which are purchased on the same day. There will be no dead oysters. " Although most stall owners insisted on this, under the reporter's questioning, one stall owner fished out a bag of oyster meat from the ice water box, saying that it was an oyster that was not sold yesterday. "This is only 2 yuan, and it is very affordable to take it home."
In a frozen aquatic product store, the reporter found frozen oyster meat, which is cheaper. A bag of two kilograms of oyster meat only needs 35 yuan. Different from other frozen scallops and shrimps, there is no manufacturer's information on the outer packaging of frozen oyster meat, but a transparent plastic bag. The owner said, "Many customers are restaurants. There were many bags when they bought them. It is more convenient and cost-effective to take it back to make oyster teppanyaki than to buy fresh ones. "
"Who can tell whether this oyster was alive or dead?" In an aquatic product company, I heard that the reporter wanted to buy oyster meat, and the boss even said that its quality was difficult to guarantee. "Oysters must be fresh, that kind of pure oyster meat. Who knows whether it is alive or chilled, or picking stale or even dead oysters to process? "
The city's industrial and commercial and food and drug supervision departments also said that dead oysters should not be sold and eaten in the market.
Local standards for ready-to-eat aquatic products are being revised.
In recent years, raw aquatic products, such as sashimi, have become popular foods. However, whether it is sashimi or oysters, the risk of eating them in summer is particularly high, and the current health standard for sashimi in this city is formulated by 1998, which is far behind today's needs. The reporter was informed yesterday that the city is revising the local food safety standards for ready-to-eat animal aquatic products, expanding the scope of application and tightening the microbial limit.
"In the past, the only fish we ate raw was tuna, but now it has expanded to many varieties and all kinds of shellfish. The original standard has been difficult to cover. " Fan Shoulin, secretary-general of Shanghai Aquatic Products Industry Association, suggested that the new standard should start from the aspects of knives, kitchen air and humidity, operator hygiene standards and so on to standardize the processing environment of ready-to-eat aquatic products.
The reporter saw on the website of the US Food and Drug Administration that the new standard was collected in June, which clearly pointed out: "This standard is applicable to aquatic products that can be eaten directly without thermal processing, including live animal raw aquatic products." However, the old standard of 1998 only stipulates the consumption of sashimi, live lobster, elephant trunk and fresh frozen arctic shellfish made from deep-water marine fish such as salmon, anchovies and snapper.
In addition, the scope of microbial indicators in the new regulations is expanded, and the total number of colonies, Escherichia coli, Staphylococcus aureus, Listeria monocytogenes, Salmonella, Vibrio parahaemolyticus and Vibrio cholerae are all limited, while in the old standards, only the total number of colonies, Escherichia coli and three pathogenic bacteria are detected.
Chen, head of the secretariat of the local food safety standards review committee of this municipality, said that the new draft standards have been collected online and will be promulgated and implemented as soon as possible after the final revision.
Oysters in barbecue stalls lack fresh-keeping measures
Even if they are fresh oysters at the time of purchase, the preservation measures of most barbecue stalls are hard to compliment. Last night, the reporter saw in the barbecue stalls on Shouning Road and Zaoyang Road that a large number of half-shell oysters were directly exposed to the air, and there was no plastic wrap or ice cubes to keep warm, which was easy to deteriorate and rot.
At 7 o'clock last night, the lobster shop and barbecue shop on Shouning Road were crowded, and every barbecue stall was filled with shellfish such as oysters, scallops and fresh shellfish. Half of the shells of these oysters have been removed to reveal the oyster meat, and they are placed directly next to the barbecue. Not only is there dust flying, but the hot air also warms the oysters that should be refrigerated and fresh. However, for the deterioration problem that the reporter was worried about, the stall owner did not agree: "We all bought the goods on the same day. How can it be broken after a while?"
Next to the booth, the reporter also saw two workers cleaning oysters. One person pries open the shell with a tool, takes out the half shell, and the other person washes it with water. Muddy half shells and oyster meat are soaked in some dirty water at the same time.
Some health experts pointed out that eating dead oysters can lead to diseases such as diarrhea, and even eating live oysters has great health risks. In fact, the processing technology of grilled oysters is very unreasonable. The heating surface is only concentrated at the bottom of oyster shell, so oyster meat can't be cooked completely and can't kill bacteria completely, which is easy to cause the growth of bacteria such as Escherichia coli and Vibrio cholerae, and it is easy to cause acute gastroenteritis after eating.