The Pacific cod is a species of ray-finned fish in the family Gadidae. It is a bottom-dwelling fish found in the northwestern Pacific Ocean, mainly on the continental shelf and upper slopes, to depths of about 900 m (3,000 ft). Pacific cod school together and move seasonally from deep outer and upper continental shelf areas (where they spawn) to shallow middle-upper continental shelf feeding grounds. Pacific cod spawn from January to May on the continental shelf edge and upper slope in waters 330 to 820 feet deep.