Seafood is mostly frozen seafood.
According to Guo Huawei, deputy director of Huangsha seafood and aquatic products trading market, seafood products generally include frozen products and chilled products. The so-called frozen seafood means that live seafood is put into a container filled with water and then stored at a low temperature of -35℃. The general storage period can be from half a year to 1 year. This kind of frozen seafood is suitable for transporting long-distance seafood and some "futures" seafood (some fishmongers buy it in large quantities and put it in the low-yield season); The other is chilled fish, which is wrapped in crushed ice layer by layer after being caught. Refrigeration preservation method is suitable for seafood with short transportation distance and high freshness, and the general preservation time is 1 day. In Guangzhou market, the proportion of frozen seafood is much higher than that of chilled seafood, and more than 90% are frozen products.
According to the traditional view, chilled fish is out of water for a short time, and people often think that chilled fish is fresh and the market price is more expensive than frozen fish. However, people in the industry believe that the nutritional preservation of frozen fish is actually good, because if marine fish are caught on board, they will be immediately frozen at MINUS 30℃, frozen as hard as a stone, and can be preserved for more than half a year without deterioration. However, it is not the best way to thaw frozen fish naturally without other auxiliary means. Every merchant has its own thawing technology. The meat quality, taste, freshness and sanitation after thawing are actually closely related to the thawing technology of various businesses, and their own thawing technology is like a trade secret, which is generally inhuman to outsiders.
Members of the public should learn to be vigilant when purchasing frozen and chilled marine fish. If the fish gets bigger, it is mostly marine fish that is about to deteriorate or has deteriorated; Judging from the color, the darker ones are also stale marine fish; Stale marine fish tastes stale, just like chewing bean curd residue.
Pay attention to whether the formaldehyde of nine-bellied fish exceeds the standard.
It is understood that some unscrupulous traders are unwilling to increase the cost of preservation, but "preserve" chilled fish by increasing the amount of formaldehyde, extending the shelf life and entering the market through illegal channels. The seafood market in Guangzhou will regularly sample and test the products of merchants. Mainly detect whether the contents of formaldehyde and chloramphenicol exceed the standard. Among them, the nine-bellied fish is frequently recruited. According to the relevant person in charge of Guangzhou Agricultural Products (Aquatic Products) Quality Inspection Station, because the price of nine-bellied fish is relatively cheap, it is quite popular among merchants, but nine-bellied fish is easy to deteriorate, so it is more common to use formaldehyde to extend the shelf life. Judging from the test, it can be said that the nine-bellied fish is frequently recruited. When people buy aquatic products, they should pay attention to the fact that the color of chilled fish soaked in formaldehyde will be too white, and it will be tough to taste. If the amount of formaldehyde is too large, it will be irritating when chewing. In addition, all qualified chilled fish in Guangzhou market have "inspection and supervision certificate" or "quality and safety inspection card". When purchasing, citizens should pay attention to the voucher and keep the sales receipt. Write an article