About OPRI

Staff Members

Name Surname
Ocean Policy Research Institute
(Division of Ocean Policy Research)

Director/Senior Research Fellow
Tomonari Akamatsu
Tomonari Akamatsu is Director at Policy Research Department of OPRI, SPF. He was educated theoretical physics at Tohoku University and received Ph.D. (agriculture) from Nihon University in 1996. His majors are underwater bioacoustics and passive acoustic monitoring of aquatic creatures. He was a senior researcher of National Research Institute of Fisheries Science until 2019 and temporarily studied at National Institute of Polar Research and Thomas Hunt Morgan School of Biological Sciences, University of Kentucky as a visiting scholar. He was an associate editor of Journal of the Marine Acoustic Society of Japan, Bioinspiration & Biomimetics, Journal of Ethology and committee member of marine environmental assessment organized by Ministry of the Environment, NEDO, Ministry of Economy, Trade and Industry. He is a member of cetacean and sirenian specialists groups of IUCN, ISO/TC43/SC3, IEEE/OES Japan chapter. He serves for the Technical committee of Animal Bioacoustics of The Acoustical Society of America, Nominations and Elections Committee of The Society for Marine Mammalogy and various academic services. He was awarded competitive research grants such as CEST, KAKENHI and BRAIN and published over 100 peer reviewed papers.


  • Underwater bioacoustics
  • Marine acoustics
  • Acoustic remote sensing
  • Noise impact assessment
2023 Statistical analysis of measured underwater radiated noise from merchant ships using ship operational and design parameters 
Masahiro Sakai, Reo Haga, Toshio Tsuchiya, Tomonari Akamatsu, Naoya Umeda
The Journal of the Acoustical Society of America 154(2) 1095-1105
2023 Sound properties produced by white-edged rockfish (Sebastes taczanowskii) in relation to body and swim bladder size 
Naoto Matsubara, Seiji Katakura, Ryuzo Takahashi, Tomonari Akamatsu, Hiroki Yasuma
2022 Tidal effects on periodical variations in the occurrence of singing humpback whales in coastal waters of Chichijima Island, Ogasawara, Japan
Koki Tsujii, Tomonari Akamatsu, Ryosuke Okamoto, Kyoichi Mori, Yoko Mitani
Scientific Reports 12(1)
2021 Baseline soundscapes of deep‐sea habitats reveal heterogeneity among ecosystems and sensitivity to anthropogenic impacts
Chong Chen, Tzu‐Hao Lin, Hiromi Kayama Watanabe, Tomonari Akamatsu, Shinsuke Kawagucci
Limnology and Oceanography 66(10) 3714-3727 
2021 Seasonal and diel changes in cetacean vocalizations monitored by passive acoustic methods in Nemuro Strait adjacent to the Shiretoko World Natural Heritage Site 
Mayuko Otsuki, Tomonari Akamatsu, Takahiro Nobetsu, Yoko Mitani


Visualization of ocean
Academic/Professional Background
Professional Background
  • 2020- Director, Policy Research Department, OPRI-SPF
  • 2015- Senior Researcher, National Research Institute of Fisheries Science, Japan Fisheries Research and Education Agency
  • 2000- Senior Researcher, National Research Institute of Fisheries Engineering, Fisheries Research Agency 
  • 1999-2000 Visiting Scholar, University of Kentucky, U.S.A. 
  • 1997 Visiting Scholar, National Institute of Polar Research, Japan
  • 1989- National Research Institute of Fisheries Engineering
Academic Background
  • Nihon University Ph.D. 1996  Agriculture
  • Tohoku University M.A. 1989  Physic


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