Cod is a deep-sea fish.

Pure cod refers to fish of the genus Cod, which is divided into Atlantic cod (Gadus morhua), Greenland cod (Gadus ogac) and Pacific cod.

Haddock form under the family Cod, the usual concept of cod is extended to the Cod family of fish, there are more than 50 species, most of them are distributed in the northern Atlantic continental shelf waters, the important species are haddock, blue whiting, green haddock, cod, Norwegian haddock, and pollock, and so on.

Growth habit

Cod is a cold-water fish in the lower middle layer of the fish, for the group of fish, most of them live in the water temperature of 0 ~ 16 ° C in the cold sea, the adult fish mainly in the 175-225 meters of water layer, the juvenile fish in the 80-100 m. The adult and juvenile fish are both diurnal and diurnal, and the adult and juvenile fish have the ability to live in the water. Adults and juveniles have the habit of moving vertically during the day and night, and adults have the habit of swimming from deep water to spawning holes in shallow water, while juveniles have the habit of distributing in clusters.

Feeding on invertebrates and small fish, such as krill, mysid shrimp, smelt and capelin. Summer and fall in the Yellow Sea cold water area, winter migration in the water depth of 50 ~ 80 m coastal mud bottom area overwintering. Generally, they are sexually mature at 4-5 years of age. Spawning period in December to the following April, the peak period in January-February, carrying 25-1 million eggs, 10,000 grains, sinking eggs, egg diameter of 0.98-1.05 mm, fertilized eggs in 6-7 ° C water temperature in 12-17 days to hatch.