*Benedict Yamamura^1,2, Hayate Kimura¹, Wataru Sano¹, Soko Hirabayashi¹, Yukihiko Imai¹, Kyotak Ishiguro², Hironobu Kan¹ (1.Kyushu University, Integrated Sciences for Global Society - Research Center for Coastal Seafloor , 2.Marshall Islands Marine Resources Authority )