Cod has fewer thorns and more meat, rich in nutrients, and it is very convenient to buy from supermarkets, which is welcomed by many people. Cod sold in supermarkets may be real, or it may be carp other cheap but similar fish counterfeits.

The cod being grown mainly in the Atlantic Ocean, mainly produced in Norway, Russia and other places, low yield, high protein content, good nutrition, expensive. It is because of the high price of real cod, resulting in some businesses will be other meat white, less thorny fish are as cod to sell, and the actual price of such fish is very cheap, disguised as cod to sell Jiahe can be doubled several times.

Combined with the cod sold in supermarkets are about 200 to 500 grams of cod pieces, people can not see the most discriminating features of the fish head, it is difficult to distinguish between real and fake cod, so the possibility of buying fake cod in the supermarket is relatively large.