The Yellow Sea is a shelf sea surrounded by the Korean peninsula and the eastern coast of China. The bordering countries derive a substantial share of their food from fishing in these coastal waters. Synoptic maps of water column integrated primary production were derived using an existing primary production algorithm based on ocean color satellite data in the Yellow Sea. The middle of the Yellow Sea (MYS) was found to have higher levels of primary production in these months compared with the two shallower (<50 m) coastal areas. The low primary production in the coastal areas is caused by high turbidity due to strong tides and shallow depths. Lower turbidity in the central part of the Yellow Sea allows the light energy for primary production to penetrate to a deeper depth. The mean daily rate of the integrated primary production in the middle of the Yellow Sea (MYS) was 947 mgC m-2 d-1 in May and 723 mgC m-2 d-2 in September. The mean values in Chinese coastal waters and Korean coastal waters were respectively 590 and 589 mgC m-2 d-1 in May, and 734 and 553 mgC m-2 d-1 in September. Our computation of daily total primary production for the entire the Yellow Sea is 19.7 × 104 tonC d-1 in May and 15.8 × 104 tonC d-1 in September.