First, the necessary factors. High-quality cod is produced in the depths of the cold ocean near the North Pole, such as Canada and Greenland. They feed on mollusks at the bottom of the ocean, and a large number of bacteria, toxins and parasites will gather on their heads. The head of the newly caught cod will be immediately removed and frozen to avoid the invasion of parasites into the cod due to the increase of temperature, which will seriously affect its food safety. Because the head is inedible, removing the head in the country of origin can reduce unnecessary transportation costs. The Bohai Sea and the Yellow Sea in China are also the producing areas of cod, and their heads will be removed here.
Second, human factors. There are four kinds of real cod in the world, which are relatively expensive, namely Atlantic cod, Pacific cod, Greenland cod and Alaska cod. The production of these cod is relatively low, which can not meet the needs of modern people. So people will eat close relatives of real cod, such as haddock, marlin and yellow cod. The yield of these close relatives is relatively large and the price is lower than that of real cod. But the meat quality is poor and the fat content is high. Among them, it is not excluded that illegal businesses sell fake cod instead of cod. The most common fish include oily fish, which is very similar to cod in appearance. After the heads of these fish are removed, non-professionals can't tell them apart.
Three, buy cod need to pay attention to a few points. Don't be greedy and cheap. The price of real cod is around several hundred yuan, the price of close relatives cod is generally around one hundred yuan, and the price of fake cod is around several tens of yuan. When buying real cod, you must pay attention to the origin mark on the package.