The 19th Tokyo Bay Symposium (sponsored by National Research Institute for Land and Infrastructure Management, Ministry of Land, Infrastructure, Transport and Tourism) was held at Osanbashi Bridge Hall in Yokohama Port on October 18 (Thu), 2018. Professor Sasaki gave a lecture entitled "Possibility of Blue Carbon and its Social Implementation", and Mr. Endo, Ph.D. candidate made a poster presentation entitled "Field survey on upwelling of hypoxic water in Sanbanze Shallow Water Area at the head of Tokyo Bay". It was a great success with about 300 participants.