Cod has always been a valuable marine fish, especially in recent years, with the increasing intensity of marine fishing, the annual output of cod is getting lower and lower, so the price of cod is getting higher and higher, and almost a catty can be sold for more than 200 yuan.
The way to sell cod is generally to cut it into pieces instead of whole pieces, which gives those unscrupulous businessmen an opportunity, so oily fish comes in handy.
The fish meat of oily fish is similar to that of cod, so some people will buy oily fish from fishermen at a low price, then slice it and openly take it to the market as expensive cod for sale, making huge profits. Ordinary consumers can't tell whether it is real cod or fake cod, so they occasionally buy fake cod, that is, oily fish, which leads to symptoms such as diarrhea after eating it.
The origin of the name of oily fish
The reason why it has such a name is mainly because more than 40% of the fish's weight is "wax ester", which is an ester formed by higher fatty acids and fatty alcohols. Simply put, it refers to an unsaturated fat, that is, oil, so this fish is named oily fish.
The wax ester contained in oil fish is not toxic, but it is difficult for human body to digest. If eaten, these wax esters will accumulate in the rectum, causing discomfort such as diarrhea and gastrointestinal spasm after eating. Wax esters may also flow out of the anus in the form of orange oil and become "jet fighters".