Cod is mainly distributed in the North Pacific Ocean, native to the cold waters of the North Atlantic Ocean from Northern Europe to Canada and the eastern United States. The main cod producing countries in the world are Canada, Iceland, Norway and Russia, and the Japanese origin is mainly in Hokkaido. In China, it is mainly found in the Bohai Sea, the Yellow Sea and the northern part of the East China Sea. There are major fishing grounds in the northern Yellow Sea, east-southeast of Shandong Gaojiao, and the southern and southeastern part of the Ocean Island. Due to overfishing in the past hundred years, cod has been listed as an endangered species, and the amount of fishing is strictly limited.
Cod is a deep-sea species that belongs to the cod family. Cod has silver cod, black cod, blue cod, golden cod, long-tailed cod and other classifications, and cod because of its excessive moisture and lead to loose meat, scales large and hard, taste and other fish is relatively poor, the price is very low, so the nutrition is also a lot worse. Cod on the market is a mixed bag, because cod and oil fish are similar, vendors will be oil fish scales scraped off the exterior as cod for sale, from the appearance, the difference between the two is not big. Consumers must keep their eyes open, a little inattention, will buy the wrong. There are many experts believe that oil fish is not suitable for consumption.