Kuroshio is a warm western boundary current of the North Pacific flowing along Rhukyu Islands and Japan. In spite of low-nutrient concentration of Kuroshio water, the Kuroshio region is an important spawning and nursery ground of various fish species and also a good fishing ground. In order to understand the mechanisms of high fisheries productivity from oligotrophic condition, i.e., Kuroshio Paradox, and to find a way for sustainable use of the ecosystem services, we start the Study of Kuroshio Ecosystem Dynamics for Sustainable Fisheries (SKED) from October 2011 funded by the MEXT (Ministry of Education, Culture, Sports, Science and Technology, Japan.